Retirement Accounts

Week 22 was about what you invest in — stocks, bonds, and the low-cost funds that bundle them — and the durable ideas that matter: diversification, time horizon, compounding, and keeping fees low. This lesson is about the special accounts you can hold those investments inside. That distinction is the key to the whole topic, and it trips up a lot of people: a 401(k) or an IRA is not itself an investment — it’s a container, a tax-advantaged wrapper, and you still choose what goes inside it (often the same index and target-date funds from Week 22). The reason these containers exist is that the government deliberately offers a tax break to encourage people to save for retirement, since most of us will need decades of income after we stop working. The same two framings from last time carry over. First, this is education, not advice: this lesson explains how the accounts work and what the rules are, but it will not tell you how much to contribute, whether traditional or Roth is right for you, or what to hold inside — those depend on your income, your tax situation, and your life, and a general lesson that answered them would be guessing. There is exactly one near-universal point it can make, and we’ll get to it: how an employer match works, because it’s literally part of your pay. Second, none of this assumes you have money to set aside right now. These accounts only become relevant if and when you have earned income and room in your budget, and if you don’t, you are not behind — understanding how they work means you’ll recognize the opportunity if it ever arrives, and know what questions to ask. The numbers in this area also change every single year, so wherever a current figure appears, it’s labeled with its year and linked to the official IRS source you should check for the latest.

Main topic

The tax-advantaged accounts used for retirement saving in the U.S. — employer plans (401(k), 403(b), 457) and the employer match, and individual accounts (Traditional and Roth IRAs), plus the self-employed options — how each works, the difference between “traditional” (pre-tax now, taxed later) and “Roth” (after-tax now, tax-free later), and the rules that matter most: the match, vesting, contribution limits, early-withdrawal penalties, and what to do with an account when you change jobs. Throughout, the lesson teaches the mechanics and the durable principles, labels every changeable figure with its year, and routes every personal decision to the IRS, the Department of Labor, Investor.gov, and a fiduciary professional.

Why this matters

Retirement accounts are wrapped in jargon — 401(k), 403(b), Roth, vesting, rollover, RMD — and the jargon hides a simple structure underneath. The misconception this lesson targets is the belief that a “401(k)” or “IRA” is a thing you invest in, like a stock, and that the choice is mysterious and best left alone. In reality, these are just accounts with tax advantages, and inside each one you hold ordinary investments (the funds from Week 22). Once you see them as containers, the whole topic gets clearer: the questions become which container, funded how, holding what, under which rules — and most of those have learnable, factual answers.

The mental shift is from retirement accounts as an intimidating black box to retirement accounts as tax-advantaged wrappers with rules worth knowing. Two of those rules carry outsized weight. One is the employer match — for people who have a job that offers one, it’s extra money from the employer, and not contributing enough to receive it leaves part of your compensation unclaimed. The other is what happens when you change jobs: a single hasty decision (cashing out) can cost a big chunk of your savings to taxes and penalties, while a calm one (a direct rollover) preserves it. Knowing these two things alone prevents two of the most common and expensive retirement-saving mistakes.

This connects to the money-relationship thread. These accounts are tools for a specific, human purpose: having income in a future when you may not be working. They are not a scoreboard, and the point isn’t to accumulate the largest possible number — it’s to build, at whatever pace your life allows, toward a future where you have choices. Used well and kept simple, they’re one of the most powerful tools ordinary people have. The aim here is understanding, not pressure.

Learning objectives

By the end of this week you’ll be able to:

• Explain what a tax-advantaged retirement account is, and that it’s a container holding ordinary investments.

• Explain how an employer 401(k)/403(b)/457 plan works, including the employer match and vesting.

• Explain the difference between traditional (pre-tax) and Roth (after-tax) accounts, and why neither is universally “better.”

• Describe the key rules — contribution limits (and that they change yearly), the early-withdrawal penalty, and required minimum distributions.

• Know the four options for an old account when you change jobs, and why cashing out is usually the costliest.

Lesson summary

1. Why these accounts exist, and what they actually are

A retirement account is an ordinary investment account with a tax advantage attached — a deliberate incentive from the government to encourage people to save for a retirement that may last decades. The crucial thing to understand is that the account is a container, not an investment. Inside a 401(k) or an IRA, you hold the same kinds of investments from Week 22 — often mutual funds, index funds, or target-date funds. The account is the wrapper; the funds are what’s inside; the tax advantage is why the wrapper exists. (Week 22 spells out exactly what that wrapper shelters you from — the yearly tax on dividends and the capital-gains tax you’d owe when selling at a profit in a regular taxable account — which is what makes these accounts so valuable.)

The tax advantage comes in two flavors, and this is the single most important concept in the whole lesson:

• Traditional (“pre-tax”): you contribute money before income tax, which lowers your taxable income now; the money grows without being taxed along the way; and you pay ordinary income tax when you withdraw it in retirement. Tax break now, taxed later.

• Roth (“after-tax”): you contribute money you’ve already paid tax on, so there’s no break today; but qualified withdrawals later — including all the growth — come out completely tax-free. No break now, tax-free later.

If that pre-tax-versus-after-tax distinction feels familiar, it’s the same idea from Week 8 about how money is taxed before or after it reaches you. Which flavor works out better depends on things no general lesson can know about you — chiefly whether your tax rate is likely to be higher now or in retirement — which is exactly why this lesson won’t tell you which to choose. (Accessibility note: contributing to any of these requires earned income, and the value of understanding them when you don’t yet have money to spare is simply that you’ll know how they work when you do.)

2. Employer plans — 401(k), 403(b), 457 — and the match

If you have a job that offers a retirement plan, it’s usually a 401(k) (at for-profit companies), a 403(b) (at schools and nonprofits), or a 457(b) (at government and some nonprofit employers). They work the same way in essence: you choose a percentage of your paycheck to contribute, it’s deducted automatically (often before tax, though many plans also offer a Roth option), and it goes into investments you select from the plan’s menu — frequently including target-date funds (Week 22) as a simple default. Many plans now automatically enroll new employees at a default contribution rate, which you can change.

Here is the one near-universal, genuinely useful point this lesson can make as education — the employer match. Many employers contribute money to your account based on what you contribute — a common formula is something like 50 cents (or a dollar) for each dollar you put in, up to a cap such as 6% of your pay. That match is extra money from your employer — effectively part of your compensation. If you contribute less than the amount needed to get the full match, you simply don’t receive the rest of it; that unclaimed match is employer money left on the table. This is why contributing at least enough to capture the full match is widely considered one of the few near-automatic moves in personal finance — though whether and how much you can contribute still depends on your own budget, and that part is your decision, not something this lesson can make for you.

Two more mechanics matter:

• Vesting. Your own contributions (and their growth) are always 100% yours immediately. But the employer’s matching contributions often become yours gradually, on a vesting schedule — for example, a “cliff” where you’re 0% vested until you’ve worked a few years and then 100%, or “graded” vesting that phases in over several years (U.S. Department of Labor). If you leave before you’re fully vested, you forfeit the unvested portion of the match — so it’s worth knowing your plan’s schedule.

• Contribution limits. The IRS caps how much you can contribute each year, and these limits change annually. For 2026, the employee contribution limit for 401(k), 403(b), and most 457(b) plans is $24,500, with an additional catch-up of $8,000 for those age 50+ (and a higher catch-up for ages 60–63) (IRS, 2026 limits). Because these figures are adjusted most years, always check the current number at the IRS link rather than relying on a remembered one.

3. IRAs — the account you open yourself, Traditional or Roth

An IRA (Individual Retirement Arrangement) is a retirement account you open on your own, separate from any job, at a brokerage or bank — useful whether or not you have a workplace plan (you can have both). The same traditional-versus-Roth choice applies:

• A Traditional IRA may let you deduct your contribution (a tax break now), with withdrawals taxed later. The deduction can be reduced or phased out at higher incomes if you (or your spouse) are covered by a workplace plan.

• A Roth IRA gives no deduction now, but qualified withdrawals (contributions and growth) are tax-free later. Roth IRAs have income eligibility limits — above a certain income you can contribute less, or nothing. For 2026, for example, the ability to contribute to a Roth IRA phases out for single filers with modified income between $153,000 and $168,000 (higher for married couples filing jointly) (IRS).

The IRA contribution limit also changes yearly: for 2026 it’s $7,500 total across all your IRAs (plus a $1,100 catch-up at age 50+) — and note that’s a combined limit, so you can’t put the full amount in both a Traditional and a Roth in the same year (IRS). As always, verify the current figure at the IRS rather than trusting a number that may have aged. You need earned income to contribute, and the contribution deadline for a given year runs until that year’s tax-filing deadline.

Whether Traditional or Roth is the better fit is a genuinely personal question — it hinges largely on whether you expect your tax rate to be higher today or in retirement, which no one can answer for you in the abstract. This lesson explains the difference; the choice is yours, ideally with the IRS’s information and a professional.

4. Self-employed options, and the rules that apply to everyone

If you’re self-employed or run a small business, there are IRAs built for that — chiefly the SEP-IRA (funded by the employer/business, with a much higher contribution ceiling) and the SIMPLE IRA (for small employers, with employee contributions and a required employer contribution). The specific limits change yearly and are at the IRS; the point here is simply that tax-advantaged retirement saving exists for the self-employed too, not only for people with a workplace 401(k).

A few rules apply across nearly all of these accounts, and they’re stable enough to state plainly (all from the IRS):

• Early-withdrawal penalty. These accounts are for retirement, and the tax code discourages tapping them early. Generally, money withdrawn before age 59½ is hit with a 10% additional tax on top of any regular income tax owed (IRS, Topic 557). There are specific exceptions (certain first-home, education, medical, disability, and birth/adoption situations), and Roth contributions (not earnings) can generally be withdrawn anytime since they were already taxed — but the default assumption should be that this money stays put until retirement.

• Required minimum distributions (RMDs). With traditional (pre-tax) accounts, the government eventually wants its tax, so you must begin taking minimum withdrawals starting at age 73 (IRS). Roth IRAs have no required minimum distributions during the owner’s lifetime — one of their distinctive features. (When you’re nearing retirement, the Retirement Transition module covers the order to draw these accounts down and how it affects your taxes.)

5. The big, avoidable mistakes

Retirement accounts have a handful of classic, costly errors, and knowing them is most of the protection:

• Leaving the employer match unclaimed. As above — if your budget allows contributing enough to get the full match and you don’t, you’re leaving part of your pay behind. (Educational, general — your budget is yours.)

• Cashing out when you change jobs. This is the big one. When you leave a job, your old 401(k) doesn’t vanish — the money is yours (the vested part), and you have four options: leave it in the old plan, roll it into your new employer’s plan, roll it into an IRA, or cash it out (DOL). Cashing out before 59½ is usually the worst choice: the money becomes taxable income, gets the 10% early-withdrawal penalty, and loses all future tax-advantaged growth — together that can take a very large bite. The safe move to preserve the money is a direct (“trustee-to-trustee”) rollover, where the funds go straight from the old plan to the new account without passing through your hands. Beware the indirect version: if a check is made out to you, the plan withholds 20% and you have just 60 days to redeposit the full amount (including the withheld portion) or it’s treated as a taxable, penalized distribution.

• Forgetting about vesting. Leaving a job right before you’re fully vested can forfeit thousands in unvested employer match. Check your vested balance before you go.

• High fees. As Week 22 showed, fees compound against you. Old workplace plans sometimes carry high fees; it’s worth comparing them to your other options. (This is one reason some people roll old accounts into a low-cost IRA — though the right move depends on your situation.)

• 401(k) loans gone wrong. Some plans let you borrow from your 401(k). If you leave the job with the loan unpaid, the outstanding balance can be treated as a distribution — taxable, and penalized if you’re under 59½.

6. Where to get help — and the honest limit

Because this lesson teaches mechanics and rules rather than telling you what to do, the most valuable things it can give you are where the authoritative, current information lives and where to get personalized help.

• For contribution limits, income rules, and account rules: the IRS retirement pages — irs.gov/retirement-plans and the annual limits announcement. This is the source of truth for every figure that changes yearly.

• For your rights in an employer plan (vesting, what happens when you leave, plan disclosures): the U.S. Department of Labor — dol.gov/agencies/ebsa.

• For neutral investor education and choosing/checking a professional: the SEC’s Investor.gov, plus FINRA BrokerCheck and the SEC’s IAPD (from Week 22).

• For your specific plan: your employer’s HR or plan administrator, who can give you your plan’s match formula, vesting schedule, investment menu, and fees — the details that are specific to your job.

• For a personalized plan: a licensed fiduciary professional (one legally required to act in your interest), ideally fee-based; ask how they’re paid and check them on the tools above.

The honest limit, one more time: this lesson can explain what a 401(k) and an IRA are, how the match and vesting and the traditional/Roth choice work, and what the rules are. It cannot and will not tell you how much to contribute, whether traditional or Roth fits you, what to invest in, or when to do anything — those depend entirely on your income, your tax picture, your timeline, and your life. Take the understanding here; take any actual decision to the IRS’s current information and, if you want it, a fiduciary professional.

Key vocabulary

A beginner-friendly example

Malik, age 27. (A hypothetical example — not a real person.)

Malik started a job a year ago and signed up for the company’s 401(k) during onboarding without really reading the details — he picked a small contribution and moved on. Recently a coworker mentioned “getting the full match,” and Malik realized he had no idea what his own plan actually offered.

So he pulled up the plan summary. It said the company adds 50 cents for every dollar you contribute, up to 6% of your pay. Malik did the simple arithmetic of how it works: the match is money the company adds on top of his salary, based on what he puts in — but only up to that 6% point. He’d been contributing less than that, which meant he wasn’t receiving the full match the company was offering; the rest was just sitting there unclaimed. He understood the principle clearly now: that match is effectively part of his pay, and it’s widely considered one of the few near-automatic wins in personal finance to contribute at least enough to capture all of it — if the budget allows. He looked honestly at his own budget to decide what he could actually afford, because that part was his call, not a rule someone could hand him.

While he was in there, he learned two more things. His plan summary showed a vesting schedule — the company’s matching contributions would become fully his after he’d been there a few years — so he now knew how much of the match was already locked in versus still vesting. And he saw that inside the 401(k) he was choosing from a menu of funds, with a target-date fund as the default; he made a note to review what he was actually holding and what it cost, using what he’d learned in Week 22 about fees. He didn’t rush any big moves. He just went from not understanding his own plan to understanding it — and took the budget question to think over rather than to a stranger online.

Notice what Malik did and didn’t do. He didn’t leave his own plan a mystery, and he didn’t let a vague sign-up stand in for actually knowing his match terms, his vesting, and his costs. He read the plan summary, did the plain arithmetic of how the match works, and then made the contribution decision based on his own budget rather than a one-size-fits-all rule. That’s the move worth borrowing exactly: if you have a workplace plan, find out your own match formula and vesting schedule and what your investments cost — because the match is part of your compensation and is widely considered worth not leaving unclaimed when your budget allows, while how much to contribute beyond that is a personal decision only you can make, ideally with your plan’s information and, if you want it, a fiduciary professional.

Homework

Find out one concrete fact about your own retirement picture: if you have a job, what your plan’s employer match formula and vesting schedule are (from HR or the plan summary); or, if you don’t have a workplace plan, look up the current year’s IRA contribution limit at irs.gov and write down the traditional-vs-Roth difference in your own words. One real fact about how your accounts (or future accounts) work. Tiny is a strategy.