401(k) vs IRA vs Roth vs HSA: Where Each Dollar Goes

The one idea behind every account: when do you pay tax?

Strip away the jargon and every retirement account answers a single question — at what point does the IRS take its cut? There are three answers, and each account is just one of them in a wrapper:

• Tax later (traditional / pre-tax). You deduct contributions now, the money grows untaxed, and you pay ordinary income tax on every dollar you withdraw in retirement. Great if your tax rate will be lower later.
• Tax now, never again (Roth). You contribute after-tax dollars — no deduction — but growth and qualified withdrawals are completely tax-free. Great if your tax rate will be higher later, or you just value certainty.
• Never taxed at all (HSA, for medical use). A health savings account is deductible going in, grows tax-free, and comes out tax-free for qualified medical costs — the only account that's untaxed on all three legs.

Because nobody knows their future tax rate for certain, most people benefit from holding some of each — a mix of pre-tax, Roth, and taxable money gives you levers to pull in retirement. That flexibility is exactly what makes a smart withdrawal order and a Roth conversion ladder possible later.

The accounts, side by side (2026)

Here are the major players, their approximate 2026 contribution limits, and how each is taxed. Treat the figures as close estimates — confirm the exact current-year numbers before you rely on them.

A few notes worth knowing. The 401(k) employee limit is separate from the employer match — matching dollars sit on top of your $24,500. The IRA limit is a combined cap across your traditional and Roth IRAs, not per account. And the HSA catch-up is $1,000 starting at 55, not 50. You can size your own 401(k) contribution and match with the 401(k) contribution calculator, and your HSA room with the HSA contribution calculator.

The 401(k): start with the free money

A workplace 401(k) (or 403(b) for nonprofits) is usually the foundation, for one reason above all others: the employer match. A typical match — say, 50% of your contributions up to 6% of pay — is an instant 50% return on those dollars, before the market does anything. There is no other investment that reliably hands you 50% risk-free. Whatever else you do, contribute at least enough to capture the full match; anything less is leaving guaranteed money on the table. See exactly how much with the 401(k) contribution calculator.

Many plans now offer both traditional and Roth 401(k) options. The match itself typically lands in the pre-tax bucket regardless. Your own deferrals can go to whichever flavor fits your tax situation.

IRAs: your own account, more investment freedom

An IRA (Individual Retirement Arrangement) is an account you open yourself, outside of work, usually with far more investment choice and lower fees than a 401(k). The 2026 limit is about $7,500 (plus a $1,100 catch-up at 50+), combined across traditional and Roth.

The Roth IRA is a saver's favorite: tax-free growth, tax-free withdrawals, no lifetime RMDs, and you can always pull your contributions (not earnings) back out penalty-free. Direct Roth contributions phase out at higher incomes, though a "backdoor" Roth is a common workaround. The traditional IRA gives a deduction now, but if you're also covered by a workplace plan the deduction phases out as income rises — so higher earners often use the traditional IRA only as a stepping stone to a backdoor Roth.

The HSA: the quiet champion

If you have a qualifying high-deductible health plan, the HSA is arguably the single best account in the tax code. It's the only one that's tax-free on all three legs: you deduct contributions, the balance grows untaxed, and withdrawals for qualified medical expenses are tax-free. Contributions also usually dodge FICA (payroll) tax when made through your employer — an edge even a Roth doesn't have.

The power move: if you can afford to pay current medical bills out of pocket, invest the HSA and let it compound for decades, saving your receipts to reimburse yourself tax-free later. After 65, non-medical withdrawals are taxed like a traditional IRA (no penalty), so a worst case still looks like a solid pre-tax account. Estimate your room and the tax it saves with the HSA contribution calculator, and see how HSA and 401(k) deferrals lift your paycheck's take-home with the take-home pay calculator.

The priority order: where each dollar should go

Given limited dollars, here's a widely used order of operations. Fill each tier before moving to the next; adjust for your own situation.

1. 401(k) up to the full match. Free money and an instant return — always first.
2. Max the HSA (if you're eligible). Triple tax advantage beats everything else dollar for dollar.
3. Max an IRA — Roth or traditional. Low fees, wide investment choice; Roth if you expect higher future taxes, traditional if lower.
4. Go back and max the 401(k) up to the $24,500 employee limit (plus catch-up if 50+).
5. Taxable brokerage account. No contribution limit and fully flexible — the home for everything beyond the tax-advantaged caps.

One caveat: if your employer 401(k) has bad, high-fee funds, some savers prefer to max the IRA before returning to the 401(k) beyond the match. And high-interest debt (credit cards) should generally be cleared before steps 2–5, since paying off 20% interest is a guaranteed 20% return.