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Put $100 a month into a broad index fund at 23 and never touch it again. At 63, at a 7% average annual return, you’re looking at roughly $260,000. You contributed $48,000. The other $212,000 came from time doing the work while you were busy being 27, 31, 44.
Wait two years to start and that same $100 a month lands closer to $225,000. Same contributions per month. Thirty-six thousand dollars less, just for hesitating in your early twenties.
That’s the whole argument for saving for retirement in your 20s. Not because you’ll be rich by 30, but because the money you put in now gets four decades of compounding, and money you put in at 40 gets two. Here’s how to actually do it without living on rice and canceling every plan you make with friends.
The free money comes first
Before you think about Roth IRAs or index funds, check whether your employer matches 401(k) contributions. A typical match is 50% of the first 6% you contribute, which is an instant 3% raise paid in retirement dollars. A 3% match on a $55,000 salary is $1,650 a year of somebody else’s money.
Contribute at least enough to get the full match. Even if you do nothing else this year, do that. Not taking it is turning down part of your compensation package.
Then build a small cash cushion
The order matters. A $1,000 to $3,000 cash buffer in a high-yield savings account keeps a dead car battery or a surprise dental bill from turning into a credit card balance at 24% APR. Once that’s in place, work toward three to six months of expenses. In your 20s, when rent is often your only giant fixed cost, that usually means $4,000 to $10,000, not a scary number.
Pick the account that fits your tax situation
Your 20s are probably the lowest-tax-bracket decade you’ll ever have. That makes Roth accounts unusually attractive, because you pay tax now at a low rate and never again.
- Roth IRA: $7,000 contribution limit for 2025 (or your earned income, whichever is lower). No tax on withdrawals in retirement. You can pull out your contributions any time without penalty, which makes it a decent backup emergency fund in a real crisis.
- Traditional 401(k): Pre-tax, lowers your taxable income now, and comes with the match. Great if you’re in a higher bracket than you expect later.
- HSA: If you have a high-deductible health plan, this is the most tax-advantaged account that exists. Money goes in pre-tax, grows tax-free, and comes out tax-free for medical costs.
- Taxable brokerage: No limits, no penalties, no special rules. Useful once the tax-advantaged buckets are full or you’re saving for something before 59½.
A perfectly reasonable 24-year-old setup: 6% into the 401(k) for the match, $300 a month into a Roth IRA, and the rest of your savings going into cash until you have three months of expenses.
Automate it, because willpower is unreliable
Nobody consistently remembers to transfer $400 to a brokerage account on the 4th of every month. Set the automatic contribution and treat the money as gone before it hits your checking account. You cannot spend what you never see.
The single best trick in your 20s is the raise bump. Every time your salary goes up by $3,000, increase your retirement contribution by 1% of pay. A 1% bump on a $50,000 salary is $500 a year, or about $19 per paycheck. You won’t notice it. Do it four or five times by 30 and you’ve quietly gone from saving 6% to saving 11% without ever feeling a squeeze.
Your savings rate matters more than your fund picks
Saving 10% of your income versus 20% changes your retirement date by roughly a decade. That gap dwarfs the difference between a good index fund and a great one. If you want to go deeper into structuring a high savings rate while still enjoying your money, the dumbbell FIRE investing method is worth a read. It splits your money into a safe base and a more aggressive growth sleeve instead of trying to find one compromise in the middle.
Keep the investing part genuinely boring
A target-date fund or a total market index fund with an expense ratio under 0.10% is all most people need. The difference between a 0.03% fund and a 1% fund sounds trivial. Over 40 years, that 1% fee can eat roughly a quarter of your ending balance.
If you want to understand exactly what happens to your money once it’s invested, from fund mechanics to how returns actually get paid, this explainer on how it works for your investments covers the basics without jargon.
When the market drops, keep buying
You will live through at least three or four crashes before you retire. The 2020 drop took the S&P 500 down about 34% in 33 days. In 2022, a boring global portfolio fell roughly 18%. Both times, people in their 20s who kept their automatic contributions bought shares at a discount.
That’s the reframe worth internalizing early: a falling market is a sale on future retirement income. This piece on why a crashing stock market is great for our children’s future makes the case better than I can.
The people who get hurt are the ones who sell in the panic and then wait for the all-clear signal. Nobody rings a bell at the bottom.
The spending choices that buy you the most freedom
A $500 car payment sounds normal. Invest that $500 instead, for 40 years at 7%, and it becomes about $1.3 million. That’s not an argument for driving a death trap, it’s an argument for questioning whether a $32,000 car is worth seven figures of retirement income when a $14,000 used one does the job.
Three other 20s spending categories worth auditing:
- Housing: a roommate for three extra years at $700 a month saved is over $25,000 in cash, before any growth.
- Subscriptions and delivery apps: $60 a week on food delivery is $3,120 a year. That’s most of a Roth IRA.
- Lifestyle inflation: the first $10,000 of every raise tends to vanish into nicer things. Pre-commit half of it to savings before the paycheck arrives.
If your income is low right now
You do not need $500 a month to start. Open a Roth IRA with $500 and set up a $25 weekly automatic transfer. That’s $1,300 a year and it builds the habit, which is the hard part. Freelancers and gig workers can use a SEP IRA or solo 401(k), and both let you contribute far more than an IRA once income grows. A spouse with earned income can fund a Roth IRA for a non-working partner too. The account type is a detail. Starting is the decision.
Mistakes that cost the most in this decade
Cashing out a 401(k) when you change jobs is the big one. You lose the match, pay income tax, and eat a 10% early withdrawal penalty. Roll it into an IRA or your new plan instead. That $8,000 balance at 26 becomes roughly $120,000 at 66 if you leave it alone.
Other expensive moves: buying whole life insurance because a salesperson called it an investment, holding 30% of your retirement in a single stock because you like the company, and waiting for a market crash to start investing. Someone is always predicting a crash. They’ve predicted eleven of the last three.
Check it once a year, then go live your life
Pick one day a year, maybe your birthday or the first weekend of January, and do four things. Raise your contribution by 1%. Confirm your 401(k) match is fully captured. Check that your fund fees are still low. Rebalance if your stock allocation has drifted more than a few percent.
That’s a 45-minute annual task. Everything else in this article is just the setup for it. The rest of the year, ignore the balance. Watching a number move daily is a great way to panic-sell at exactly the wrong time, and it isn’t going to make the compounding faster.
Money is one long sequence of small decisions rather than a single dramatic one, which is basically what life as one financial quest after another gets at. You handle the account, you handle the next raise, you handle the next car. Twenty years from now, the version of you who started at 23 will have a very different set of options than the one who spent that decade meaning to get around to it.
