401(k), IRA, HSA: the tax-advantaged alphabet, decoded
The tax code will pay you to save. Here is the map of where and why.
The U.S. tax code contains a standing offer: route your savings through the right accounts and keep tens of thousands of dollars that would otherwise go to taxes. The accounts differ on two questions only — when you pay tax, and what the money is for.
The one distinction that matters: now or later
Traditional accounts (401(k), traditional IRA) deduct contributions today and tax withdrawals in retirement. Roth accounts tax contributions today and never again — growth and withdrawals are tax-free. The choice reduces to one comparison: your tax rate now versus your expected rate in retirement. High earners near their peak usually favor traditional; early-career savers in low brackets usually favor Roth, paying a small tax bill now to make decades of compounding permanently untaxed. Splitting between both is a legitimate hedge against the fact that nobody knows future tax law.
The 401(k): the workhorse
Employer-sponsored, with contribution limits several times an IRA's, payroll-deducted, and often carrying a match — free money that outranks every other use of a dollar. Its weaknesses: your investment menu is whatever your employer chose, and fees vary widely. When you change jobs, you can usually roll the balance into an IRA and regain full control.
The IRA: the flexible one
Anyone with earned income can open one at any brokerage and buy nearly anything. Lower limits, but total freedom of choice and typically minimal fees. Income limits restrict Roth IRA contributions and traditional-IRA deductions for high earners, though workarounds exist in current law.
The HSA: quietly the best deal in the code
Available only with a high-deductible health plan, the health savings account is the sole triple-tax-free vehicle: deductible going in, untaxed growth, tax-free out for medical costs — and after 65 it doubles as a traditional-style retirement account for any purpose. The power move, if cash flow allows: pay current medical bills out of pocket and let the HSA compound invested for decades.
The order
A sensible default: 401(k) to the full match → HSA → IRA to its limit → back to the 401(k) maximum → taxable investing. Tax rules change at the margins nearly every year; percentages and limits are always worth verifying against current IRS figures. The architecture, though, has been stable for decades — and the offer stays on the table whether or not you take it.