Retirement feels impossibly far away in high school or college — which is exactly why understanding it now is a superpower. Because of compounding, the money you invest earliest has the most time to grow, so small amounts started young can outgrow much larger amounts started later.
Why Starting Early Wins
Retirement saving is the clearest example of compounding at work. Someone who invests a modest amount in their twenties and then stops can end up with more at retirement than someone who invests far more but starts in their forties — simply because the early money had decades to grow on itself. Time, not the size of each contribution, does the heavy lifting.
The 401(k): Saving Through Your Job
A 401(k) is a retirement account offered by an employer. You contribute straight from your paycheck, often before taxes — which lowers your taxable income now — and the money grows without being taxed each year. The biggest perk is the employer match: many employers add money to your account based on what you contribute. That match is essentially free money and an instant return, so a common rule is to always contribute at least enough to get the full match.
The IRA: Saving on Your Own
An IRA (Individual Retirement Account) is one you open yourself, separate from a job. There are two main types. A traditional IRA works like a 401(k) — you may contribute pre-tax and pay taxes later when you withdraw. A Roth IRA is funded with money you've already paid taxes on, and then it grows and can be withdrawn tax-free in retirement. For young people in low tax brackets, a Roth is often especially attractive, because you lock in today's low tax rate.
Tax Advantages Boost Growth
Both account types share a key feature: your investments grow without being taxed every year along the way, which lets compounding work harder than it would in a regular account. Combined with an employer match, these tax advantages are why retirement accounts are usually the first place to invest for the long term.
Getting Started
The typical order of operations: contribute enough to your 401(k) to capture the full employer match, then consider funding a Roth IRA, and invest the money in low-cost, diversified funds rather than leaving it as cash. Increase your contributions over time as your income grows. The single most important move is simply to start.
Key Takeaways
- Starting young beats saving more later, thanks to decades of compounding.
- A 401(k) is employer-based; always contribute enough to get the full match (free money).
- An IRA is opened on your own; Roth grows tax-free, traditional is taxed later.
- Tax-advantaged growth is why retirement accounts are the go-to for long-term investing.
Check Your Understanding: Saving for Retirement: 401(k)s and IRAs
Five practice questions on Saving for Retirement: 401(k)s and IRAs. Tap an answer to see whether you're right and why each choice is right or wrong.
1. Jordan earns $50,000 a year. Her employer adds 50 cents to her 401(k) for every dollar she contributes, on contributions up to 6% of her salary. She currently contributes 2% of her salary. How much more would her employer add each year if Jordan raised her contribution to 6%?
Answer: B. At 2%, she contributes $1,000 and gets a $500 match. At 6%, she contributes $3,000 and gets a $1,500 match. The match grows by $1,500 − $500 = $1,000.
Why the other choices are wrong:
- A. $500 is the match Jordan already gets (50% of her $1,000 contribution), not the increase.
- C. $1,500 is the full match at 6%. She already receives $500 of it, so the increase is $1,000.
- D. $2,000 is how much more Jordan herself would contribute (4% of $50,000). The employer adds only 50 cents per dollar of that, which is $1,000.
2. Ana invested $2,000 a year from age 25 to 34, then stopped adding money. Ben invested $2,000 a year from age 35 to 64. Both earned the same 7% average yearly return.
Ana: contributed $20,000, worth about $225,000 at age 65
Ben: contributed $60,000, worth about $202,000 at age 65
Which conclusion is best supported by these results?
Answer: D. Ana's money started growing ten years earlier and compounded for decades, while Ben's later contributions had less time. Time, not the size of each contribution, did the heavy lifting.
Why the other choices are wrong:
- A. Putting in more isn't the same as ending with more. Ben contributed three times as much but finished about $23,000 behind, because his money had less time to grow.
- B. Both earned the same 7% rate. The difference is time: Ana's money stayed invested longer, not at a higher rate.
- C. Ana stopped adding new money, but her balance stayed invested until 65, so it faced the same market ups and downs and kept growing.
3. Kayla, 19, works part-time and is in a low tax bracket. She expects to earn much more later in her career. She wants to open an IRA. Which choice and reason fit her situation best?
Answer: C. A Roth is funded with money that's already been taxed, then grows and comes out tax-free in retirement. Paying tax now locks in her low rate before her income rises.
Why the other choices are wrong:
- A. This describes a Roth, not a traditional IRA. A traditional IRA may be funded with pre-tax money, and withdrawals are taxed later.
- B. Roth contributions come from money she has already paid tax on. The tax-free part is the growth and the withdrawals in retirement.
- D. This reverses the logic. Putting off tax helps most when your rate is high now; with a low rate now and higher income later, paying tax up front is the better deal.
4. Sam earns a $45,000 salary and contributes 6% ($2,700) to his traditional 401(k) before taxes. His employer adds a $1,350 match to the account. Ignoring any other deductions, how much of Sam's pay is subject to federal income tax this year?
Answer: A. Pre-tax 401(k) contributions lower taxable income now: $45,000 − $2,700 = $42,300. The employer's match goes into the account and isn't taxed this year either.
Why the other choices are wrong:
- B. This subtracts the employer's $1,350 match instead of Sam's own $2,700 contribution. It's Sam's pre-tax contribution that lowers his taxable pay.
- C. This treats the contribution as after-tax money. Contributions to a traditional 401(k) come out before taxes, so they lower taxable income now.
- D. This adds the match to Sam's taxable pay. The match goes straight into his 401(k) and, like his contributions, isn't taxed until he withdraws it.
5. Leah, 23, has an emergency fund and no high-interest debt. Her employer matches her 401(k) contributions up to 5% of her salary, and she can afford to save 10% of her pay for retirement. Which plan makes the most sense?
Answer: D. This captures the full employer match first (free money and an instant return), then uses an IRA she opens on her own for the rest.
Why the other choices are wrong:
- A. At 2%, Leah leaves part of the match unclaimed, and the match is free money. Raising contributions over time is smart, but only after she's getting the full match.
- B. She'd get the full match, but money left as cash barely grows and may not keep up with inflation. Retirement money should be invested in low-cost, diversified funds.
- C. Waiting gives up both the employer match and seven years of compounding. Starting early matters more than saving larger amounts later.
Keep Studying
Related: Compound Interest, Investing Basics.
These guides are educational and written for the AP Business with Personal Finance course. They provide general information, not personalized financial advice.