Retirement Account Trading Restrictions: IRA and 401(k) Investment Rules

Key Takeaways

Most investors who trade actively inside a retirement account have absorbed one or two of these rules but not the full picture. The margin prohibition is reasonably well known. The asset prohibitions often are not. The self-dealing rules — which go well beyond "don't borrow from the IRA" — are where the most expensive surprises happen, because a violation doesn't just create a tax bill for the disallowed transaction; it collapses the account's entire tax-qualified status for the year. This guide covers the full set of IRS-imposed trading and investment restrictions for traditional and Roth IRAs, explains how 401(k) plans layer employer-specific restrictions on top, and walks through the edge cases: what options you can and can't write, how FINRA's 2026 margin rule changes interact with IRA-specific prohibitions, and why selling a stock at a loss in a taxable account and buying it back inside an IRA is uniquely destructive compared to a standard wash sale.

Direct answer: IRAs cannot use margin borrowing, cannot hold short stock positions, cannot own life insurance contracts or most collectibles, and cannot engage in any transaction between the IRA and a disqualified person (including yourself). Violation of the prohibited transaction rules causes the entire IRA to lose its tax-qualified status for the full tax year in which the violation occurred — not just the disallowed amount. 401(k) plans have these same statutory limits plus plan-level restrictions that typically confine investments to a short list of mutual funds and ETFs chosen by the plan sponsor.

• Margin borrowing is prohibited in standard IRAs under the IRS's prohibited transaction rules (IRC Section 4975) — buying on credit and standard short selling are both off limits.
• Prohibited assets include life insurance contracts and collectibles (art, antiques, rugs, gems, most coins, wine, stamps), with narrow exceptions for certain IRS-approved gold and silver coins.
• Self-dealing rules bar transactions between the IRA and any disqualified person — you, your spouse, your lineal descendants and their spouses, and entities they control — not just obvious "borrowing from yourself."
• Options trading is possible in IRAs, but only at lower approval levels: covered calls and cash-secured puts are generally permitted; naked options never are; spreads depend on the custodian.
• FINRA eliminated the classic $25,000 pattern day trader minimum in June 2026, replacing it with real-time intraday margin requirements — but this change has limited practical relevance to IRAs, which still cannot use any margin regardless of the framework in effect in taxable accounts.
• A wash sale triggered by buying a replacement security inside an IRA permanently destroys the disallowed loss — it does not carry over to the IRA's cost basis the way it would in a cross-taxable-account wash sale.
• Unrelated Business Taxable Income (UBTI) can make an IRA owe current federal income tax even on income that would otherwise accumulate tax-deferred — most commonly triggered by master limited partnerships (MLPs) and debt-financed investments.

IRS Prohibited Transactions: The Core Rules

The prohibited transaction rules in IRC Section 4975 are the bedrock of IRA investment restrictions. They exist because Congress wanted to prevent IRA owners from using the tax shelter for personal enrichment outside the account — essentially using the tax-deferred wrapper to benefit themselves directly rather than saving it for retirement. The rules do this by identifying categories of transactions that are simply not allowed regardless of whether the IRA owner thinks they're getting a fair deal.

Who is a disqualified person?

Every prohibited transaction involves the IRA on one side and a disqualified person on the other. Understanding the scope of disqualified persons is essential, because the rules are broader than most investors initially assume.

Disqualified persons include:

• The IRA owner themselves
• The IRA owner's spouse
• Lineal ancestors (parents, grandparents) and lineal descendants (children, grandchildren) of the IRA owner
• Spouses of those lineal descendants
• Any corporation, partnership, trust, or estate in which disqualified persons own at least 50% of the combined voting power, beneficial interest, or value
• Any fiduciary of the IRA itself (which can include financial advisers who have discretionary control)
• Any person providing services to the IRA

Notice that siblings, nieces, nephews, and cousins are not disqualified persons. That means, for example, that an IRA can lend money to or buy property from a sibling without triggering a prohibited transaction — though most tax advisers still recommend against anything that creates ambiguity.

The specific prohibited transactions

IRC Section 4975(c)(1) enumerates the actual prohibited transactions. They include:

• Sale, exchange, or lease of property between the IRA and a disqualified person, in either direction. Selling property you personally own to your IRA is prohibited. Buying property from your IRA for personal use is prohibited. Leasing property between them is prohibited.
• Lending money or extending credit between the IRA and a disqualified person. This is the basis for the margin prohibition — if the IRA takes on a margin loan, the IRA itself is effectively using borrowed money, which the IRS treats as using the account as collateral for a loan to a disqualified person (you). Using the IRA as security for any personal loan is also explicitly prohibited.
• Furnishing goods, services, or facilities between the IRA and a disqualified person. If your IRA owns a rental property (in a self-directed IRA) and you personally do maintenance work on that property, you've provided services to the IRA, which is a prohibited transaction even if you charge nothing — the intent to avoid benefit is irrelevant.
• Transfer to, or use by or for the benefit of, a disqualified person of income or assets of the IRA. This is the catch-all self-dealing provision. Any arrangement that channels IRA assets or income toward a personal benefit — even indirectly — falls here.
• Act by a disqualified person who is a fiduciary to deal with the income or assets of an IRA in their own interest or for their own account. This applies to advisers and plan managers who use their position for personal gain.
• Receipt of consideration by a disqualified-person fiduciary from a party dealing with the IRA in connection with a transaction involving the IRA's income or assets. Kickbacks and undisclosed commissions from third parties dealing with the IRA.

The consequence of a prohibited transaction

This point deserves emphasis because it is not intuitive. A prohibited transaction does not simply disallow the specific transaction and create a tax liability on that amount. Under IRC Section 408(e)(2), the entire IRA ceases to be an individual retirement account as of the first day of the taxable year in which the prohibited transaction occurred. The entire fair market value of the account as of January 1 of that year is treated as a taxable distribution to the account owner — subject to ordinary income tax — and if the owner is under age 59½, the 10% early withdrawal excise tax applies on top. There is no cure, no exception for good-faith mistakes, and no partial treatment.

For a $500,000 IRA, a single prohibited transaction in any year means receiving a $500,000 ordinary income addition on that year's tax return, regardless of whether the actual violation involved $5,000 or $500,000. The destruction is total and retroactive to January 1.

Prohibited Investments: Assets an IRA Cannot Hold

Beyond prohibited transactions, IRC Section 408(a)(3) separately bans specific categories of assets from being held inside an IRA at all, regardless of whether the purchase involved a disqualified person.

Life insurance contracts

An IRA cannot invest in life insurance. This applies to term policies, whole life, variable universal life, and all other variants. The prohibition is categorical — there is no exception for certain types of life insurance or certain coverage amounts. The rationale is that life insurance provides a benefit (the death benefit) that is fundamentally personal rather than retirement-savings-oriented, and Congress did not want the IRA tax shelter used to fund that benefit. Annuities, which are different financial products despite sometimes being sold alongside insurance, are generally permitted inside IRAs — the restriction is specific to life insurance contracts.

Collectibles

IRC Section 408(m) prohibits IRAs from holding collectibles. The statute defines collectibles broadly to include:

• Works of art
• Rugs or antiques
• Metals or gems (with the exception described below)
• Stamps
• Coins (with narrow exceptions)
• Alcoholic beverages (wine, spirits)
• Any other tangible personal property specified by the IRS

If an IRA acquires a collectible, the acquisition is treated as a distribution from the IRA in the amount of the cost of the collectible. This means immediate income tax liability — and the 10% early withdrawal penalty if applicable — without the IRA owner actually receiving any cash. The collectible stays in the account but the tax bill arrives immediately.

The narrow precious metals exception

IRC Section 408(m)(3) carves out certain gold, silver, and platinum coins for IRA ownership, along with certain bullion. Specifically, the following are permitted:

• U.S. gold coins (American Gold Eagle, 1 oz, ½ oz, ¼ oz, and 1/10 oz)
• U.S. silver coins (American Silver Eagle)
• U.S. platinum coins (American Platinum Eagle)
• Gold, silver, platinum, or palladium bullion of a fineness equal to or exceeding the fineness required for metals under commodity futures contracts, provided the bullion is in the physical possession of the IRA trustee (not the account owner)

The bullion custody requirement is critical: the IRA owner cannot personally hold approved bullion. It must be in the possession of a qualified IRA custodian. Self-directed IRA custodians that specialize in precious metals typically have established relationships with IRS-approved depositories for this purpose.

Most other gold and silver coins — including pre-1933 U.S. gold coins, foreign coins, and numismatic coins with premium value above metal content — are collectibles and cannot be held in an IRA. The category that is allowed is specifically listed and narrow, not a general permission for any precious metal product.

Margin Trading and Short Selling in IRAs

Two of the most common active-trading strategies in taxable brokerage accounts — buying on margin and short selling — are essentially unavailable in standard IRAs. The reasons are related but distinct.

Why margin is prohibited

Margin trading in a taxable brokerage account works by the broker extending credit to the customer, secured by the customer's portfolio. In an IRA, any borrowing using IRA assets as collateral constitutes a prohibited transaction under IRC Section 4975 — specifically, using the IRA as security for a loan to a disqualified person (the account owner). Additionally, the IRS has held that margin arrangements within the IRA itself (where the IRA takes on debt) violate the prohibited transaction rules by extending credit between the plan and a disqualified person.

The practical consequences of the margin prohibition include:

• You cannot purchase securities beyond what the cash in your IRA will support at the time of purchase. If you have $20,000 in cash in your IRA, you can buy at most $20,000 of securities.
• You cannot hold a leveraged position that requires maintaining margin equity above a certain level.
• You cannot trade futures contracts that require posting margin, because the margin requirement itself would necessitate using IRA assets to secure a position that creates potential liability beyond the account's current value.
• Standard short selling — which requires both a margin account and the ability to hold a liability position — is unavailable.

Limited margin IRAs: what they are and what they are not

Some custodians offer what they market as "limited margin IRA" accounts. This is not margin trading in the conventional sense. A limited margin IRA allows the account to use the unsettled proceeds from a sale to fund another purchase before the standard T+1 settlement cycle completes, avoiding the "freeriding" violation that can otherwise arise. This is a settlement mechanics accommodation, not actual leverage — you are not borrowing money, you are simply using proceeds the account already has the right to receive. The total position size is still limited to the total value of the account. Limited margin IRAs do not permit actual leveraged positions, naked options, or true short sales.

Short selling: why it is not available in standard IRAs

Short selling requires borrowing shares from a broker (who typically sources them from other customers' margin accounts), selling those borrowed shares, and later repurchasing them to return. This creates a liability in the account — the obligation to return the borrowed shares — that technically exceeds the current assets in the position. Because IRAs cannot use margin to support this liability, and because the transaction inherently involves borrowed securities (a form of credit extension), standard short selling is not permitted in standard IRA accounts.

For investors who want bearish exposure inside an IRA, the practical alternatives are:

• Buying put options on the security or index — this requires only the premium paid upfront, no margin, and provides defined downside exposure without borrowing shares.
• Inverse ETFs — exchange-traded funds designed to deliver a return inverse to an index on a daily basis, available at most custodians for IRA accounts. They do not require margin since they are structured products.
• Selling covered calls — which generates income and creates a limited synthetic short exposure above the strike price, though this is a different risk profile than actual short selling.

FINRA's 2026 margin rule changes and their interaction with IRA restrictions

In June 2026, FINRA replaced its longstanding pattern day trader (PDT) rule — which had required any pattern day trader to maintain at least $25,000 in account equity — with a new real-time intraday margin requirement framework under amendments to FINRA Rule 4210. Under the new rules, brokers calculate real-time intraday margin excess for margin account customers rather than applying the blunt $25,000 floor. The transition period runs through October 20, 2027, meaning some brokers may still apply the older PDT rules during the migration window.

For IRA investors, this change has limited direct effect. The reason is that IRA restrictions on margin are statutory (imposed by the IRS through the prohibited transaction rules) and not derived from FINRA's margin rules. Whether FINRA's framework requires $25,000, uses real-time calculations, or is eliminated entirely, an IRA still cannot hold a margin account in the true sense. The 2026 changes matter primarily for taxable margin accounts. The one area where there could be indirect interaction is for investors who were using the $25,000 PDT rule as a guide for how much to keep in a taxable account versus an IRA — that reference point has changed, but the IRA margin prohibition itself has not.

Options Trading in IRAs: What Is and Is Not Allowed

Options trading in IRAs is possible but heavily circumscribed. Brokerage custodians tier their options permissions into approval levels, typically numbered 1 through 4 (or similar), with each level adding strategies that carry more risk. In IRA accounts, the maximum permissible level is lower than in taxable accounts, and the reason is the same across the board: options strategies that require margin or create liabilities in excess of deposited assets are not compatible with IRA rules.

Level 1 — Covered calls

Writing covered calls — selling call options against stock you already own in the IRA — is permitted at essentially all custodians that offer options in IRAs. This strategy generates premium income and creates a capped upside, but the maximum loss is limited to the loss on the underlying stock (offset by the premium received). No margin is required because the position is "covered" by the existing stock holding. This is typically the floor of what custodians offer in retirement accounts.

Level 2 — Buying options, cash-secured puts

Buying calls and puts outright is generally available at Level 2. The maximum loss on a purchased option is the premium paid, which is fully cash-settled at the time of purchase — no margin required. Cash-secured puts — selling put options where the IRA holds enough cash to buy the shares if the put is exercised — are also Level 2 at most custodians. Like covered calls, cash-secured puts don't require margin because the maximum liability (buying the shares at the strike price) is covered by cash already in the account.

Level 3 — Spreads

Debit spreads and, at some custodians, credit spreads fall at Level 3. A debit spread (buying one option and selling another at a different strike or expiration) has a defined maximum loss equal to the net premium paid — no margin required for a basic debit spread. Some custodians allow debit spreads in IRAs; others do not. Credit spreads are more complex because the sold option creates an obligation that must be margined, and custodians that offer "limited margin" IRAs sometimes permit credit spreads within defined risk parameters. Custodians that do not offer limited margin IRAs typically do not permit credit spreads at all in retirement accounts.

Level 4 — Naked options (never permitted)

Naked options — selling calls or puts without a covering position or full cash securing — are never available in IRAs at any custodian. A naked call, for example, creates theoretically unlimited liability (because there's no ceiling on how high the underlying stock can trade), and a naked put creates liability equal to the full strike price times 100 shares if the option is exercised and the underlying falls to zero. Neither liability can be properly margined in an IRA, so these strategies are categorically excluded. Any custodian claiming to offer naked option writing inside an IRA is either misrepresenting the product or has structured it in a way that doesn't actually involve naked exposure.

Practical guidance for IRA options traders

Because custodians handle IRA options permissions differently — and because some custodians offer limited margin IRAs that unlock Level 3 strategies while others cap at Level 2 — it's worth checking with your specific custodian before assuming a strategy is available. Options approval levels for retirement accounts are applied and reviewed separately from taxable account approvals at most major brokers. Getting approved for Level 4 in a taxable account does not automatically grant Level 3 in your IRA.

401(k) Trading Restrictions: Beyond the IRS Rules

Traditional 401(k) plans are subject to all the same IRS prohibited transaction rules that apply to IRAs, but they layer an additional and often more restrictive set of constraints: the plan document itself and the plan sponsor's choices about the investment menu. Understanding 401(k) restrictions requires understanding the relationship between statutory limits and plan-level limits.

The statutory floor: same IRS rules as IRAs

ERISA (the Employee Retirement Income Security Act) and the IRC apply the same fundamental prohibited transaction framework to 401(k) plans that applies to IRAs. No margin, no short selling, no transactions with disqualified persons, no prohibited assets. These baseline restrictions are identical. A 401(k) plan cannot offer margin trading any more than a standard IRA can, even if the plan's custodian would otherwise have the capability.

The plan document: the tighter practical constraint

Most employer-sponsored 401(k) plans are not self-directed in the same sense as an IRA. The plan sponsor — typically your employer, working with a plan administrator — selects a menu of investment options that participants can choose among. This menu almost always consists exclusively of mutual funds and ETFs, often from a single fund family or a small group of approved options. Individual stocks, options, alternative assets, and most other instruments are simply not on the menu. Participants cannot buy Apple stock, Treasury bonds, REITs, or anything not explicitly listed in the plan's investment offerings.

The reasons for this are partly fiduciary (the plan administrator bears liability for the investment menu under ERISA), partly operational (custodial systems for 401(k) plans are designed around pooled fund structures, not individual securities), and partly administrative simplicity. Plan sponsors who do offer broader investment options — typically through a brokerage window, discussed below — do so deliberately and with additional operational infrastructure.

Company stock in 401(k) plans

One exception to the mutual-fund-only menu is the company stock option, which many large employer plans include. Participants may be able to purchase shares of their own employer's stock within the 401(k). This comes with concentration risk that has caused catastrophic losses in notable cases (Enron is the classic example), and most financial planners recommend limiting company stock to a small percentage of the total 401(k) portfolio. There are no IRS rules prohibiting heavy concentration in company stock within a 401(k), but ERISA's diversification requirements and prudence standards can become relevant if the plan is designed to push participants into company stock without adequate disclosure.

The brokerage window

Some 401(k) plans offer a "brokerage window" — an arrangement that allows participants to invest a portion of their 401(k) balance in a self-directed brokerage account with broader investment options, including individual stocks, ETFs not on the core menu, and sometimes options. The availability and terms of brokerage windows vary widely by plan. Even where a brokerage window exists, margin and standard short selling remain prohibited for the same statutory reasons they are excluded from IRAs. Options trading through a brokerage window is subject to the same IRA-like approval level constraints because the account remains a tax-qualified retirement account regardless of the broader investment menu available.

Roth 401(k) and solo 401(k) plans

Roth 401(k) plans have the same investment restrictions as traditional 401(k) plans — the after-tax contribution structure affects how distributions are taxed, not what the plan can hold. Solo 401(k) plans, available to self-employed individuals and business owners with no employees other than a spouse, can offer broader investment options because the plan participant and plan sponsor are the same person, making the administrative flexibility easier to implement. Even so, the statutory prohibited transaction rules apply equally, and margin and short selling remain unavailable.

Self-Directed IRAs: Broader Assets, Higher Risk of Violations

A self-directed IRA (SDIRA) is not a different type of IRA under the tax code — it's a traditional or Roth IRA held at a specialized custodian that accepts non-standard assets. The statutory rules are identical to any other IRA. What differs is the custodian's willingness to hold assets that traditional brokerage custodians decline: real estate, private equity, private lending (promissory notes), cryptocurrency at some custodians, and other alternative investments. The flexibility makes SDIRAs attractive to certain investors; it also makes them the most frequent site of accidental prohibited transactions.

What an SDIRA can hold

An SDIRA can hold any asset not specifically prohibited by the IRS. The statutory prohibited assets — life insurance contracts and collectibles — still apply. Everything else is theoretically available, subject to finding a custodian willing to hold it. Common SDIRA investments include:

• Real property (residential, commercial, raw land)
• Mortgage notes and private lending arrangements
• Private company stock (in companies where the account owner is not a disqualified person)
• Private equity and venture capital fund interests
• Tax liens
• Cryptocurrency (some custodians)

Where SDIRA investors most commonly violate the prohibited transaction rules

The self-dealing rules become practically complex when the IRA holds real assets rather than publicly traded securities. Common problem scenarios include:

• Personal use of IRA-owned real estate. If the IRA owns a rental property and the account owner stays in it — even for one night, even if no rent is charged — that is a personal benefit from IRA assets and constitutes a prohibited transaction. The property must be a pure investment used by third parties.
• Personal labor on IRA-owned property. Performing maintenance, repairs, or improvements on a property owned by the IRA, even if no compensation is taken, constitutes furnishing services to the IRA by a disqualified person — a prohibited transaction.
• Commingling personal and IRA funds. Paying a property expense from personal funds and expecting reimbursement from the IRA (or vice versa) creates a credit arrangement that can trigger the prohibited transaction rules.
• Buying property from or selling property to a disqualified person. The IRA cannot purchase a property from the account owner, their spouse, or their children, even at fair market value and even with a formal appraisal.
• Guaranteeing an IRA debt with personal assets. If the SDIRA takes on a non-recourse mortgage (one of the few permitted forms of IRA debt), the account owner cannot personally guarantee that debt. A personal guarantee constitutes using the IRA as security for a personal loan and triggers the prohibited transaction rules.

The SDIRA custodian's role is to hold assets and facilitate transactions — not to vet whether any given transaction complies with the prohibited transaction rules. The compliance burden falls entirely on the account owner. The IRS does not review SDIRA transactions in advance, and there is no advisory ruling service that approves specific transactions before they occur. Investors using SDIRAs for real estate or private investments typically need ongoing tax counsel from an attorney or CPA experienced with IRC Section 4975 to stay on the right side of the rules.

UBTI: When an IRA Owes Current Income Tax

One of the fundamental premises of IRA investing is that income accumulates inside the account without triggering current tax — dividends, interest, and capital gains are sheltered until distribution. This premise holds for most standard IRA investments: publicly traded stocks, bonds, mutual funds, and ETFs. It does not hold unconditionally when the IRA invests in certain structures that generate operating income rather than passive investment income.

What UBTI is

Unrelated Business Taxable Income, defined in IRC Sections 511-514, is income from a trade or business that is regularly carried on and is not substantially related to the tax-exempt purpose of the holding entity. For IRA purposes, the relevant rule is that income generated by an IRA's investment in an active business — even if that business is generating profits from activities completely unrelated to retirement savings — can be subject to current income tax at trust rates, which are compressed and reach the top bracket quickly.

If UBTI from all sources inside the IRA exceeds $1,000 in a tax year, the IRA owes tax on the excess. The IRA itself — not the account owner — is the taxpayer for UBTI purposes, and the tax is paid from IRA assets. The IRA must file Form 990-T to report the UBTI and pay the resulting tax. This is a real reduction in the IRA's balance, not a deferred liability.

The most common UBTI trigger: master limited partnerships

MLPs — master limited partnerships traded on public exchanges, common in energy infrastructure — are pass-through entities. When an IRA owns MLP units, it receives a K-1 showing its allocable share of the MLP's income. Because the MLP operates an active business (pipeline infrastructure, storage, processing), the income it passes to the IRA is characterized as income from a trade or business — i.e., UBTI. Many popular energy MLPs generate enough UBTI to push an IRA above the $1,000 threshold, triggering a tax liability that the IRA must pay even though the income itself never leaves the account.

The practical consequence is that holding MLPs in a taxable account is often more tax-efficient than holding them in an IRA — the opposite of the usual logic. In a taxable account, MLP distributions may qualify for favorable tax treatment and the investor controls when to realize the gain. In an IRA, the MLP income creates a current UBTI liability that reduces the account balance by more than the tax that would apply to the same income in a taxable account.

UBTI from debt-financed income

IRC Section 514 extends the UBTI concept to "debt-financed income" — income from property that was acquired with borrowed funds. This is the provision that intersects with margin and real estate leverage. If an SDIRA uses non-recourse debt to purchase real estate (one of the few permitted forms of debt in an IRA), the portion of the income attributable to the leveraged portion of the property is debt-financed income and is treated as UBTI. If the IRA borrowed 50% of the purchase price, roughly 50% of the net rental income and 50% of any gain on sale is UBTI subject to current tax. This substantially reduces the tax advantage of using leverage inside an IRA and is why many SDIRA real estate strategies work better with all-cash purchases despite the lower return on equity.

Practical UBTI considerations

• Review K-1s for any partnership interest held in an IRA — the tax reporting is the first indicator of a UBTI issue.
• Consider whether publicly traded MLP investments belong in an IRA given the UBTI implications, or whether they are better suited to a taxable account.
• If an SDIRA uses non-recourse debt, model the UBTI tax drag against the return enhancement from leverage to determine if the leverage is actually beneficial after tax.
• UBTI filings (Form 990-T) are due by the filing deadline for the IRA's tax year — the custodian should handle the filing but will need information from the account owner about income and basis.

The Wash Sale Rule and IRAs: Permanent Loss Destruction

The wash sale rule under IRC Section 1091 prevents investors from claiming a capital loss on a security if they purchase a "substantially identical" security within 30 days before or after the sale that generated the loss. In a standard wash sale between two taxable accounts, the disallowed loss is not permanently gone — it's added to the cost basis of the replacement shares, which means it's eventually recovered when those replacement shares are sold. The loss is deferred, not destroyed.

When the replacement security is purchased inside an IRA rather than in another taxable account, the mechanics change in a way that is materially worse for the investor.

Why the IRA wash sale is different

In a cross-taxable-account wash sale, the disallowed loss increases the cost basis of the replacement shares. When those replacement shares are later sold at a gain, the higher basis offsets the gain — you effectively recover the deferred loss through a lower taxable gain. The loss wasn't lost, just delayed until you sold the replacement shares.

When the replacement purchase is in an IRA, there is no taxable cost basis to adjust. Inside the IRA, everything grows tax-deferred — there is no tracking of individual purchase prices for the purpose of calculating capital gains on future distributions, because IRA distributions are taxed as ordinary income on the full amount distributed, not as capital gains calculated from specific lots. The IRA simply doesn't have a "cost basis" to receive the carryover in any way that would offset future tax liability. The disallowed loss disappears entirely.

The practical rule

If you sell a security at a loss in a taxable account, do not purchase a substantially identical security in your IRA (or any other retirement account, including a Roth IRA or employer plan) within the 30-day window before or after that sale. The IRS's position is that a wash sale can be triggered across accounts that belong to the same individual, and the IRA purchase is no different from a repurchase in another taxable account from a wash sale trigger standpoint — except that the loss is permanently forfeited rather than deferred.

Substantially identical means the exact same security or a security that is so similar that the IRS considers it a replacement. The same stock ticker is always substantially identical. A call option deep in the money on the same stock is generally substantially identical. Superficially similar securities in the same industry are generally not substantially identical. ETFs tracking the same index are a gray area that many tax professionals advise avoiding within the wash sale window if there's any ambiguity.

A common scenario

An investor holds 100 shares of Company X in both a taxable account and a Roth IRA. In December, they sell the taxable shares at a $3,000 loss to offset gains elsewhere in the portfolio. Three days later, they rebalance the Roth IRA and, as part of that rebalance, happen to purchase 100 shares of Company X inside the Roth. The purchase inside the Roth triggers a wash sale on the taxable loss. The $3,000 loss is permanently disallowed — it cannot be added to the Roth's cost basis (Roth accounts distribute tax-free) and it produces no future tax offset. The $3,000 is simply gone as a tax benefit.

Common Misconceptions vs. Reality

Risks, Limitations, and Caveats

• This guide describes the general statutory framework under the IRC and ERISA as publicly documented. It does not constitute personalized legal, tax, or investment advice, and investors with large or complex retirement accounts should consult a tax attorney or CPA before implementing strategies that touch the prohibited transaction rules.
• The specific UBTI thresholds and trust tax rates referenced here reflect the rules as of the guide's publication date; tax law changes frequently, and these figures should be verified against current IRS publications or with a tax professional before relying on them.
• FINRA's 2026 margin framework changes were in active implementation as of this writing, with a transition period running through October 2027 — individual brokers may be on different versions of the rule during this window.
• SDIRA rules are complex enough that a full guide to self-directed IRA compliance would be several times longer than this article. The sections above describe the most common pitfalls; detailed due diligence on specific SDIRA transactions requires specialized legal counsel.
• Custodian-specific policies vary. Some brokerages offer limited margin IRAs that enable certain options strategies not available at brokerages without that feature. Confirm available strategies with your specific custodian before assuming a strategy is available or unavailable.
• The wash sale rule as applied to cross-account (taxable to IRA) purchases reflects established IRS guidance but has not been exhaustively litigated. The consensus among tax professionals is that such sales constitute wash sales with permanent loss destruction, and conservative treatment is strongly advisable.

Frequently Asked Questions

Sources and Methodology

This guide describes the statutory framework governing IRA and 401(k) investment restrictions based on publicly available regulatory and legislative sources as of mid-2026. Key sources include:

• Internal Revenue Code: IRC Sections 408 (IRA rules), 4975 (prohibited transactions), 511–514 (UBTI and debt-financed income), and 1091 (wash sale rule) are the primary statutory authorities for the rules described in this guide.
• IRS Publications: IRS Publication 590-A (Contributions to IRAs), Publication 590-B (Distributions from IRAs), and Publication 560 (Retirement Plans for Small Business) provide IRS guidance on account types and prohibited assets.
• ERISA: The Employee Retirement Income Security Act provides the statutory basis for 401(k) plan fiduciary requirements and prohibited transaction rules for employer-sponsored plans.
• FINRA: FINRA's 2026 amendments to Rule 4210, implementing real-time intraday margin requirements, are described based on FINRA's Regulatory Notice 26-10 and subsequent guidance. The transition period through October 20, 2027 is described as publicly announced.

This content was reviewed by the Swoopr Editorial Team in August 2026 and reflects publicly available information at that time. Tax rules and FINRA margin frameworks were in active development or transition as of this writing; verify current requirements directly with the IRS, your custodian, or a qualified tax professional before relying on specific statutory references or figures.

Conclusion

Retirement accounts offer substantial tax advantages, but those advantages come packaged with a set of rules that eliminate or restrict strategies freely available in taxable accounts. Margin is prohibited by statute, not by custodian policy — there is no workaround. Standard short selling is unavailable for the same reason. Certain assets — life insurance, collectibles, most coins — are banned outright, with narrow exceptions the IRS has specified precisely. Self-dealing prohibitions reach further than most investors initially assume: not just "borrowing from yourself" but any transaction between the IRA and a long list of related parties that includes immediate family members and the entities they control.

The prohibited transaction penalty is the rule most worth internalizing: it doesn't just penalize the specific violation, it retroactively collapses the entire account's tax status for the full year it occurred in. For investors using self-directed IRAs to access real estate or private assets — where the prohibited transaction rules are most easily tripped accidentally — the compliance burden is real and the stakes are high enough that professional tax guidance is not optional. For investors in standard IRAs, the practical implications are narrower but still consequential: know your options level, avoid the wash sale trap across accounts, and understand when MLP investments create a UBTI liability that offsets the expected tax advantage.

Related Reading

• Account Types & Trading Access — the parent hub for this content group, covering the full range of investment account types and trading access topics.
• Brokerage and Trading Rules — covers FINRA margin requirements, best execution, and broker oversight rules that interact with retirement account trading restrictions.
• Short Selling — a full breakdown of how short selling works in taxable accounts, including margin requirements and borrow mechanics — the contrast with what IRAs permit is instructive.