The tax code gives you several legal ways to shelter income from taxes. Most people use one or two of these accounts. Almost nobody optimizes all of them. Over a career, the difference between using these accounts well and using them poorly can easily exceed $500,000 in taxes paid or saved. I am going to walk through every major tax-advantaged account, explain how each one works, and give you a prioritization framework for funding them.
Traditional 401(k): Your employer-sponsored retirement account. Contributions come out of your paycheck before taxes, reducing your taxable income dollar-for-dollar. The 2026 contribution limit is $23,500 ($31,000 if you are 50 or older). Employer matches are free money and do not count toward your limit. The money grows tax-deferred and you pay income tax when you withdraw it in retirement. The bet is that your tax rate in retirement will be lower than your current rate. If your employer matches, contribute at least enough to get the full match before anything else. Not doing so is literally declining free money. On a $70,000 salary with a 4% match, that is $2,800 per year your employer gives you.
Roth 401(k): Same contribution limits as a traditional 401(k), but contributions are made with after-tax dollars. The growth and qualified withdrawals are completely tax-free. Many employers now offer a Roth 401(k) option alongside the traditional. The decision between the two hinges on whether you think your tax rate will be higher or lower in retirement. If you are early in your career and in a lower bracket now, Roth is almost always better. If you are in your peak earning years in the 32%+ bracket, traditional likely saves more. You can split contributions between both.
Traditional IRA: An individual retirement account you open yourself. The 2026 contribution limit is $7,000 ($8,000 if 50+). Contributions may be tax-deductible depending on your income and whether you have a workplace retirement plan. If you are single and covered by a workplace plan, the deduction phases out between $79,000 and $89,000 of modified adjusted gross income. The money grows tax-deferred and you pay taxes on withdrawals. If you do not have a workplace plan, the full contribution is deductible regardless of income.
Roth IRA: Same contribution limit as a traditional IRA, but funded with after-tax dollars. All growth and qualified withdrawals are tax-free. Income limits apply: single filers earning over $161,000 and married couples over $240,000 cannot contribute directly (but can use the backdoor Roth strategy). A Roth IRA has two unique advantages: no required minimum distributions (you never have to take money out), and you can withdraw your contributions (not earnings) at any time penalty-free. This makes it a flexible account that doubles as an emergency reserve if needed.
HSA (Health Savings Account): Available only if you have a qualifying high-deductible health plan. The 2026 limit is $4,300 individual or $8,550 family. The HSA is the only triple-tax-advantaged account in the tax code: contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. The optimal strategy is to contribute the max, invest the balance in index funds, pay current medical expenses out of pocket, and let the HSA grow for decades. After age 65, you can withdraw for any reason (you just pay income tax, like a traditional IRA). This makes the HSA a stealth retirement account.
529 Plan: A state-sponsored education savings account. Contributions are not federally tax-deductible, but many states offer a state income tax deduction. Growth is tax-free and withdrawals for qualified education expenses -- tuition, room and board, books, and up to $10,000/year for K-12 -- are tax-free. The lifetime limit varies by state but is typically $300,000-$500,000+. A newer perk: unused 529 funds can now be rolled over to a Roth IRA (up to $35,000 lifetime, subject to annual Roth contribution limits) after the account has been open for 15 years.
The optimal funding order for most people: First, 401(k) up to the employer match. Second, max out your HSA if eligible. Third, max out your Roth IRA (or backdoor Roth if over the income limit). Fourth, go back and max out your 401(k) to the full $23,500. Fifth, fund a 529 if you have education expenses planned. This order maximizes the unique advantages of each account while prioritizing free money and the most tax-efficient vehicles first. Following this framework from age 25 to 65, a person earning $75,000 and receiving 3% annual raises could accumulate over $3 million in tax-advantaged accounts -- significantly more than someone using taxable accounts alone.
