Tax-advantaged accounts: a field guide

The US tax code gives you a bunch of specialized accounts that shield certain money from taxes, each with different rules. Here's the whole landscape in one place.

Retirement: 401(k) / 403(b)

Employer-sponsored. Contribution limit $23,500 in 2026 (plus a $7,500 catch-up after 50). Money goes in pre-tax (or post-tax for Roth 401k), grows tax-deferred, taxed on withdrawal (or never, for Roth). Employer often matches contributions. 403(b) is the nonprofit/schools version — works nearly identically.

Retirement: Traditional and Roth IRA

Individual, not employer-tied. Contribution limit $7,000 in 2026 (plus $1,000 catch-up). Traditional is tax-deductible now, taxed on withdrawal. Roth is post-tax in, tax-free growth, tax-free out. Roth has income limits for direct contributions (~$150k single, ~$236k married in 2025); above that, use the backdoor.

Health: HSA

Requires a high-deductible health plan (HDHP). Contribution limit ~$4,300 individual / ~$8,550 family in 2025. Triple tax-advantaged: tax-free in, tax-free growth, tax-free out for medical expenses. The only account with all three. After age 65, can be used for anything (non-medical withdrawals taxed like a Traditional IRA).

Health: FSA

Different from HSA. Contribution limit ~$3,300 in 2025. Pre-tax in, pre-tax out for medical. But: 'use it or lose it' — money usually expires at year end (some plans allow a small rollover). Best for predictable medical expenses. Not a retirement account.

Education: 529 plans

State-sponsored accounts for educational expenses. Contributions are after-tax federally, but many states give a tax deduction on state income tax. Growth is tax-free if used for qualified education (tuition, room, board, books, K-12 up to $10k/year). Leftover funds (since 2024) can roll over to a Roth IRA for the beneficiary, subject to limits.

Other: I-bonds, Series EE bonds, municipal bonds

Not 'accounts' in the same sense, but tax-advantaged instruments. I-bonds track inflation and are state-tax-free. Municipal bonds pay interest that's usually federal-tax-free and sometimes state-tax-free. Useful for high earners in high-tax states looking to shelter taxable income.

The whole landscape in one table

What the tax shelter is actually worth

The dollar value of these wrappers is bigger than most people intuit. Take a household in the 24% federal bracket with 5% state tax investing $10,000 a year. In a taxable account, dividends get taxed annually and the final sale owes capital gains — over 30 years at 7% returns, the tax drag plus final bill costs somewhere around $150,000 versus the same money in a 401(k) or Roth. The wrapper does nothing to the investments themselves; it just removes the leak. Filling tax-advantaged space before investing in a taxable account is the closest thing to a free lunch in personal finance after the employer match.

Traditional or Roth: the one recurring decision

Almost every account on this list forces a version of the same question: pay tax now (Roth) or later (traditional)? The clean answer is to compare your marginal tax rate today against your expected rate in retirement. High earners in their peak years usually win with traditional contributions — deduct at 32% now, withdraw at an effective 15-20% later. Early-career workers, residents, and anyone in the 10-12% brackets usually win with Roth — pay the low rate now, never pay again. When genuinely unsure, splitting contributions between both types buys you 'tax diversification': flexibility to draw from whichever pot is cheaper each year of retirement, which is itself worth something regardless of where rates go.

The order of operations

1. 401(k) up to the full employer match — an instant 50-100% return, ahead of everything including most debt payoff.
2. HSA to the max if you're HDHP-eligible — the only triple-tax-free money in the code.
3. Roth IRA (or backdoor Roth if over the income limit) — tax-free growth plus contribution flexibility.
4. Back to the 401(k) up to the $23,500 limit.
5. 529 if education is a real goal and your state pays a deduction.
6. Only then a plain taxable brokerage — which is still fine, just undecorated.

The bottom line

The tax code offers a shelf of specialized containers, each shielding money from a different tax at a different time. You don't need all of them — you need the two or three that match your life: match-earning 401(k) for almost everyone, HSA if your health plan qualifies, Roth IRA for tax-free compounding, 529 if kids and college are in the picture. Fill them in order, invest the balances, and let the wrappers quietly compound their advantage for decades.

And remember that limits reset every January 1. Unused 401(k), IRA, and HSA space from past years is gone forever (with the narrow exception of prior-year IRA and HSA contributions allowed until April 15). A household that can't max everything should still automate SOMETHING into each priority account, because the habit compounds even faster than the money: contribution rates set once tend to survive raises, moves, and market panics untouched.