Direct answer: The most common and costly estate transfer mistakes for investors are: a stale beneficiary designation sending retirement account assets to an ex-spouse or deceased person, an unfunded revocable trust that fails to control the assets it was drafted to hold, naming the estate as IRA beneficiary which eliminates the 10-year stretch and accelerates distribution, failing to account for state estate taxes on multi-state property, and missing the TCJA sunset window that reduced the federal estate tax exemption back toward pre-2017 levels. Each of these failures is avoidable with periodic review.

Estate Transfer Risks, Failure Modes and Common Mistakes

By Swoopr Editorial Team

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AI-assisted content · Swoopr Investment is responsible for the final published article.

Stale Beneficiary Designations: The Most Common Failure

A beneficiary designation on an IRA, 401(k), or life insurance policy is a binding legal contract that overrides the will. An investor who gets divorced, remarries, has children, or loses a parent named as beneficiary but fails to update the designation is setting up a transfer that will not match their intent.

The Ex-Spouse Problem

The most reported and most expensive version of this failure: a 401(k) or IRA that names a former spouse as primary beneficiary and was never updated after the divorce. When the account owner dies, the former spouse legally inherits the account. The current spouse, children, or other intended heirs have no legal claim, regardless of what the will says, regardless of what the divorce decree says (unless the decree contains a qualified domestic relations order or QDRO that specifically addressed that retirement account), and regardless of how many years have passed.

Some states have automatic revocation statutes that revoke beneficiary designations to ex-spouses at divorce. However, these statutes generally do not apply to 401(k)s and other plans governed by ERISA, the federal law that preempts state law for employer-sponsored plans. Do not rely on an automatic revocation rule. Update every beneficiary designation explicitly after any divorce.

Other Stale Designation Failures

A beneficiary designation naming a person who has since died is equally problematic. If the primary beneficiary predeceases the account owner and no contingent beneficiary is named, the account may pass to the estate by default, forcing it through probate and potentially eliminating the beneficial distribution rules available to individual beneficiaries. Review designations after every significant life event: marriage, divorce, birth of a child, death of a named beneficiary, significant change in the financial circumstances of a beneficiary.

The Unfunded Trust: A Document That Does Nothing

A revocable living trust can only control assets that are legally titled in the name of the trustee. An investor who creates a trust but never retitles their assets into it has a trust that is a legal nullity for the purposes of distributing those assets.

The most common scenario: a trust document is drafted and signed, but the investor's home remains deeded to the investor personally, the brokerage account remains titled to the investor individually without any TOD registration, and no assets are actually transferred to the trust. At death, those assets go through probate just as if no trust existed. The thousands of dollars spent drafting the trust achieve nothing if the funding step is skipped.

Funding a trust requires affirmative action for each asset: real estate requires a new deed recorded with the county, brokerage accounts require retitling with the custodian (or at minimum, a TOD registration to the trust as beneficiary), and bank accounts require retitling or a POD designation to the trust. This process must be repeated for any new asset acquired after the trust is established. Establishing an ongoing review habit, ideally annual, ensures that new assets are captured.

Naming the Estate as IRA Beneficiary

When no beneficiary is designated on an IRA, or when the designated beneficiary has died without a contingent beneficiary named, the account typically defaults to the owner's estate. This is one of the most expensive administrative mistakes in estate planning.

When the estate is the beneficiary of an IRA, the account loses access to the rules that allow individual beneficiaries to defer distributions for up to 10 years (or life expectancy for eligible designated beneficiaries). Instead, the entire IRA must generally be distributed within five years if the owner died before the required beginning date for required minimum distributions. If the owner had already begun taking required minimum distributions, the estate can continue distributions based on the decedent's remaining life expectancy, but this provides less deferral than would be available to an individual beneficiary.

The accelerated distribution pushes the entire balance into taxable income, potentially at high marginal rates, and eliminates any planning flexibility for the heirs. Naming at least one primary and one contingent individual beneficiary on every retirement account eliminates this risk.

Missing State Estate Tax on Multi-State Property

An investor who owns real estate in multiple states may face estate tax obligations in each state where real property is located, even if the investor's state of domicile does not have a state estate tax. Most states that impose an estate tax do so on real property located within the state regardless of where the decedent lived.

For example, a California resident (no California estate tax) who also owns a vacation home in Oregon faces Oregon estate tax on the Oregon real property. Oregon imposes estate tax with an exemption of $1 million, far below the federal exemption. A $1.5 million Oregon property in an estate that otherwise owes no state estate tax could generate a significant Oregon estate tax obligation that the investor never anticipated.

Investors with multi-state real estate holdings should review each state's estate tax rules. Holding real estate through a limited liability company (LLC) or other entity may change the character of the asset for some state estate tax purposes, though the rules vary and the analysis is complex. Consult a qualified estate planning attorney familiar with the laws of each state where property is held.

The TCJA Sunset: A Planning Urgency That Passed for Some Estates

The Tax Cuts and Jobs Act of 2017 temporarily doubled the federal estate tax exemption from approximately $5.5 million per person to approximately $11.7 million per person (inflation-adjusted). These provisions were scheduled to sunset after December 31, 2025, reverting to the pre-TCJA baseline of approximately $7 million per person, adjusted for inflation.

Estates between the post-sunset exemption (roughly $7 million per person) and the pre-sunset exemption (roughly $14 million per person) had a narrow window to use the elevated exemption through accelerated gifting, transfers to irrevocable trusts, or other strategies that lock in the higher exemption before it expired. The IRS confirmed in 2019 that gifts made during the higher-exemption period would not be "clawed back" even if the exemption later decreases.

If your estate is in this range and you did not act before the 2025 sunset, the window for certain strategies has closed. Consult a qualified estate planning attorney about what planning options remain available. The TCJA sunset is also subject to legislative reversal, so the current exemption may differ from these projections depending on congressional action.

Frequently Asked Questions

What happens if a beneficiary designation names an ex-spouse?

If a beneficiary designation on an IRA, 401(k), or life insurance policy names a former spouse and is never updated after the divorce, the former spouse receives the account at death, regardless of what the will says or what the investor intended. The beneficiary designation is a binding legal contract between the account owner and the financial institution. Some states have automatic revocation statutes that revoke beneficiary designations to a former spouse at divorce for accounts subject to state law, but these statutes generally do not apply to ERISA-governed retirement plans such as 401(k)s, which are governed by federal law. The safest course is to update all beneficiary designations explicitly at divorce, not to rely on any automatic revocation rule.

What is an unfunded trust and why is it a problem?

An unfunded trust is a revocable living trust that was created as a legal document but never had assets retitled into it. A trust can only control assets that are legally owned by the trustee. If a home is deeded to the investor personally rather than to the trustee of the trust, the trust has no legal authority over the home at death, and the home passes through probate just as if no trust existed. Funding the trust requires actively retitling each real estate deed, account, and other significant asset into the trust's name, a process that is separate from drafting the trust agreement and is often left incomplete.

What happens when an IRA names the estate as beneficiary?

When an IRA names the decedent's estate as beneficiary, the account loses the ability to use the 10-year stretch available to individual beneficiaries. Under IRS rules, when the estate is the beneficiary, distributions must generally be completed within five years if the original owner died before the required beginning date, or over the remaining life expectancy of the deceased owner if they had already begun required minimum distributions. This accelerates the distribution of the entire IRA balance compared to naming an individual beneficiary, pushing more income into potentially higher tax brackets sooner. Naming at least one primary and one contingent individual beneficiary on every retirement account eliminates this risk.

References

Estate and tax laws are subject to change. This article reflects general U.S. estate planning concepts as of August 2026. Nothing on this page is personalized legal, tax, or financial advice. Consult a qualified estate planning attorney for guidance specific to your situation.