Direct Answer
At 18-24, open accounts in this order: capture any 401(k) employer match, then open a Roth IRA ($7,500 limit in 2026), then an HSA if you have an HSA-eligible health plan. A taxable brokerage account is useful once tax-advantaged space is full.
Investment Account Map: Which Accounts Matter Most at 18-24
Key Takeaways
- The account opening sequence at 18-24: capture 401(k) employer match first, then Roth IRA, then HSA if eligible, then taxable brokerage.
- A Roth IRA ($7,500 limit in 2026) is the highest-priority retirement account for most 18-24 year olds because low current tax rates make the Roth structure most valuable.
- An HSA offers a triple tax advantage: deductible contributions, tax-free growth, and tax-free qualified medical withdrawals. Eligibility requires an HSA-eligible high-deductible health plan.
- A taxable brokerage account has no contribution limits and no tax advantages, but provides flexibility. Use it after tax-advantaged space is filled.
- Account eligibility depends on employment status, health plan type, and income. Verify eligibility before contributing.
Step 1: Capture the 401(k) Employer Match
If your employer offers a 401(k) match, the first dollars you direct to retirement go here, up to the match threshold. A typical match might be 50% of contributions up to 6% of your salary. If you earn $45,000 and contribute 6% ($2,700 per year), your employer adds $1,350. That is an immediate 50% return before the market does anything. The 2026 employee contribution limit is $24,500, but most 18-24 year olds are not in a position to maximize this limit (IRS: 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500). The goal at this stage is capturing the full match, which typically requires contributing 3% to 6% of salary.
Not all employers offer a match, and not all offer immediate vesting. Check your plan documents for the vesting schedule. A three-year cliff vesting schedule means you forfeit unmatched employer contributions if you leave before three years. This matters when evaluating a job change early in your career.
Step 2: Open a Roth IRA
After capturing the employer match, a Roth IRA is the next account for most 18-24 year olds. Contributions are made after-tax, growth is tax-free, and qualified withdrawals in retirement are tax-free. At 22 with a $45,000 salary, a single filer's 2026 taxable income is roughly $28,900 after the $16,100 standard deduction, which falls in the 12% federal bracket (the 22% bracket starts above $50,400 of taxable income). Paying tax now at 12% and withdrawing tax-free in retirement (when your rate might be higher) is one argument for the Roth structure.
The 2026 Roth IRA contribution limit is $7,500. Eligibility phases out between $153,000 and $168,000 for single filers, and between $242,000 and $252,000 for married filing jointly. At 18-24, nearly all earners are well below the phase-out threshold. You need earned income at least equal to your contribution amount. Open a Roth IRA at a no-fee brokerage and invest in a total market index fund with an expense ratio below 0.10%.
Step 3: HSA If You Have an Eligible Health Plan
If you are enrolled in an HSA-eligible high-deductible health plan (HDHP), the HSA is arguably the most tax-efficient account available. The 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage. Contributions reduce taxable income, earnings grow tax-free, and withdrawals for qualified medical expenses are tax-free. At 18-24, most healthcare costs are low, which means HSA funds can be invested and left to grow for decades, withdrawn tax-free in retirement for Medicare premiums, healthcare costs, or any expense after age 65 (at ordinary income rates, like a traditional IRA).
Step 4: Taxable Brokerage for Overflow Savings
Once you have captured the employer match, contributed to a Roth IRA, and funded an HSA (if eligible), additional savings can go into a taxable brokerage account. There are no contribution limits or eligibility requirements. The tradeoff is that capital gains and dividends are taxable annually. Long-term capital gains (assets held over a year) are taxed at preferential rates: 0% for most 18-24 year olds in lower brackets, 15% at moderate incomes. Use the same low-cost total market index funds as in your Roth IRA.
Frequently Asked Questions
What investment accounts can an 18-year-old open?
At 18, you can open a Roth IRA (if you have earned income), a traditional IRA, a taxable brokerage account, and, if employed, enroll in a workplace 401(k) or 403(b). Some brokerages allow accounts at 18 without any parental involvement; others require you to be 21 or have a custodian until then. An HSA is available if you are enrolled in an HSA-eligible high-deductible health plan, which at 18 is most common when you are employed and on your own insurance rather than a parent's plan. You can open a 529 plan and name yourself as the beneficiary, and a parent or grandparent can also open one for your benefit. All major retail brokerages (Fidelity, Schwab, Vanguard) allow Roth IRA accounts for anyone 18 or older with qualifying earned income.
Is a Roth IRA or 401(k) better for a 22-year-old?
For most 22-year-olds, the Roth IRA is the better primary account once the 401(k) employer match is captured. A 22-year-old is almost certainly in a lower tax bracket today than they will be in retirement, making the Roth IRA's after-tax contribution structure advantageous: contributions grow and are withdrawn tax-free. The 401(k) is worth contributing to up to the match threshold (free money), and then the Roth IRA ($7,500 limit in 2026) is the next priority for most people at this income level. If your employer's 401(k) has low-cost index fund options (expense ratios below 0.10%), maxing the 401(k) beyond the match is the next step after the Roth IRA. If the 401(k) only offers high-fee funds, a taxable brokerage with index ETFs may be preferable to contributing beyond the match.
What is an HSA and who qualifies?
A Health Savings Account (HSA) is a tax-advantaged account for people enrolled in an HSA-eligible high-deductible health plan (HDHP). In 2026, an HDHP has a minimum deductible of $1,700 for self-only coverage or $3,400 for family coverage. HSA contributions are tax-deductible (reducing taxable income), grow tax-free, and can be withdrawn tax-free for qualified medical expenses. This triple tax advantage makes the HSA the most tax-efficient account available. The 2026 contribution limit is $4,400 for self-only coverage and $8,750 for family coverage. At 18-24, you qualify for an HSA if you are on an HDHP through your own employer or the individual market, and you are not enrolled in Medicare or claimed as a dependent on someone else's tax return. Coverage under a parent's HDHP can still make you an eligible individual for your own HSA, but you cannot contribute if another taxpayer is entitled to claim you as a dependent.
References
The rules and figures stated on this page come from these primary sources. Tax and benefit rules change, so confirm current amounts with the source before acting.