401(k)s, IRAs, and Other Retirement Accounts

Retirement accounts are not investments — they are containers with tax rules. The same index fund can live in a 401(k), an IRA, or a plain brokerage account; what changes is when the tax bill arrives and what strings are attached. This article tours the containers.

Employer plans: 401(k), 403(b), and 457

Most workers meet tax-advantaged saving through an employer plan. The 401(k) is the private-sector workhorse; the 403(b) is its close cousin for schools, universities, and many nonprofits; 457 plans cover state and local government employees (and some nonprofit staff), with their own somewhat different early-withdrawal rules. Mechanically they are alike: money comes out of your paycheck before you ever see it, lands in investments you choose from the plan's menu, and grows without annual tax bills along the way.

That automatic payroll deduction is quietly the most important feature. Saving that happens by default, before the money reaches a checking account, tends to actually happen — which is worth more than any clever fund selection.

Traditional vs Roth: when does the tax bill arrive?

Nearly every retirement account comes in two flavors, and the difference is a single question of timing.

Traditional: the break now

Traditional contributions go in before tax — they reduce this year's taxable income. The money grows untaxed, and every dollar withdrawn in retirement is taxed as ordinary income. In effect, the government defers its cut until you spend the money.

Roth: the break later

Roth contributions go in after tax — no deduction today. In exchange, qualified withdrawals in retirement are entirely tax-free, growth included. The government takes its cut up front and then leaves the account alone.

Which flavor wins depends mostly on whether your tax rate is higher now or will be higher in retirement — something nobody knows for certain, which is why many savers hold some of each and sort out the details later. The retirement-side consequences are covered in Taxes in Retirement.

The match and the vesting schedule

Many employers match a portion of what you contribute. A match is not a bonus or a perk; it is part of your compensation, and contributing too little to collect the full match is declining pay. One common approach among savers is to fund the plan at least to the full match before putting retirement money anywhere else.

The catch is vesting: your own contributions are always yours, but employer contributions may become yours only gradually, on a schedule measured in years of service. Leave before you are fully vested and some of the match goes back to the employer. The plan's summary document spells out the schedule.

IRAs: accounts you open yourself

An Individual Retirement Arrangement is the account you open on your own, at a provider of your choosing, with no employer involved. It comes in the same two flavors — traditional (deductible now, taxed later) and Roth (taxed now, tax-free later) — and its investment menu is as wide as the provider's shelf, which is usually far wider than an employer plan's.

Both flavors carry income-based rules: above certain income levels, the ability to deduct traditional IRA contributions (when a workplace plan covers you) or to contribute to a Roth IRA directly phases out. Those thresholds move with inflation every year, so this article will not quote them — the current figures live at irs.gov.

The gates: getting money out

Before age 59 1/2

The tax advantages come with a fence around them. Withdraw from a retirement account before age 59 1/2 and, in general, the taxable portion is hit with a 10% early-withdrawal penalty on top of ordinary tax. There are named exceptions — the "Rule of 55" for workers who leave an employer, substantially equal periodic payments under Section 72(t), and a list of hardship-style carve-outs — each with precise conditions that are worth reading at the source before relying on them.

Required minimum distributions

At the other end of life, traditional accounts stop being optional. Under current law, required minimum distributions (RMDs) begin at age 73, rising to 75 in 2033 under the SECURE 2.0 Act: each year the IRS requires a minimum withdrawal, taxed as ordinary income, whether or not you need the money. Roth IRAs are the exception — they have no lifetime RMDs, which makes them the natural last-in-line account for many retirees and a common vehicle for money intended for heirs.

Rollovers: moving money without a tax bill

Money can move between containers of the same tax flavor without triggering taxes: a 401(k) at an old job can roll into an IRA or into a new employer's plan, preserving its tax status the whole way. Done as a direct transfer between institutions, nothing is taxed and nothing is penalized. The details that matter — direct versus indirect rollovers, and mixing traditional with Roth money — are exactly the kind of thing to verify with the receiving institution and irs.gov before moving anything.

Two accounts that round out the picture

The HSA: a stealth retirement account

A Health Savings Account, available alongside a high-deductible health plan, is the only account with a triple tax advantage: contributions are deductible, growth is untaxed, and withdrawals for qualified medical expenses are tax-free — no other container gets all three. Since healthcare is one of retirement's largest expense categories, an HSA that is invested and left to grow can function as a dedicated retirement healthcare fund; after age 65, non-medical withdrawals lose the penalty and are simply taxed like a traditional IRA. More in Healthcare and Medicare.

The taxable brokerage account: the flexible layer

A plain brokerage account has no tax shelter — and no fence. No contribution limits, no income rules, no age gates, no RMDs. For anyone hoping to retire before 59 1/2, or simply wanting money that is reachable without paperwork, the taxable account is the flexible layer on top of the sheltered ones. It has its own gentler tax features (long-term capital gains treatment among them), covered in Taxes in Retirement.

A note on limits

Every account here has an annual contribution limit, and nearly all of the limits and income thresholds are adjusted year by year. Any dollar figure printed in an article — this one included — goes stale. The authoritative, current numbers are always at irs.gov/retirement-plans.

Official sources

• IRS.gov — Retirement Plans — current contribution limits, income thresholds, and withdrawal rules
• DOL.gov — EBSA — your rights in employer-sponsored plans, including vesting
• Investor.gov — the SEC's plain-language investor education site

This article is educational only and is not financial, investment, tax, or legal advice. Rules and limits change; verify details with official sources or a qualified professional.