Savings & Retirement
Published July 9, 2026
Your 401(k) balance grows from two sources: what you already have compounding, and what you keep adding. Future Value = Current Balance x (1 + r)^n plus the compounded value of your contributions, where r is the monthly return and n is the number of months. A $50,000 balance with $500 added monthly at a 7% annual return reaches roughly $106,700 in 5 years, $462,400 in 20 years, and $1,015,800 in 30 years.
"How much should I put in my 401(k)?" is one of the most-searched retirement questions, and for good reason. Contribute too little and you leave free money and decades of compound growth on the table; obsess over the maximum and you might strain your monthly budget. This guide gives you a clear, practical framework: the percentage to aim for, how to capture every dollar of your employer match, the 2026 contribution limits, and how your balance compares by age.
Most financial planners recommend saving 15% of your gross (pre-tax) income for retirement, including any employer match. If your employer matches 5%, you'd contribute 10% yourself to reach the 15% target. If there's no match, you'd contribute the full 15% on your own.
Can't hit 15% today? That's fine. The two rules that matter most are: (1) always contribute at least enough to get the full employer match, and (2) increase your contribution by 1% every year or whenever you get a raise. Small, automatic increases are nearly painless and add up enormously over time.
An employer match is the closest thing to free money you'll find in personal finance. A typical match is "100% of the first 3% and 50% of the next 2%," which fully rewards you for contributing 5% of your salary.
Consider someone earning $60,000 with that match:
That $2,400 is an instant, guaranteed 80% return on your $3,000, a return no stock or bond can promise. Failing to contribute at least 5% here means turning down a raise. Always capture the full match first, before considering any other investment.
Enter your salary, contribution percentage, and employer match to project your balance at retirement, including the powerful effect of compounding and the match.
Use the 401(k) Calculator →The IRS caps how much you can contribute from your own paycheck each year. For 2026:
| Contribution Type | 2026 Limit |
|---|---|
| Employee contribution (under 50) | $24,500 |
| Catch-up contribution (age 50+) | +$8,000 |
| Total if age 50 or older | $32,500 |
These limits apply only to your contributions, your employer's match is on top and does not count against them. Always confirm the current year's figures with the IRS, as limits are adjusted for inflation.
A widely used benchmark from Fidelity suggests saving a multiple of your salary at key ages. It's a useful gut-check, not a hard rule:
| Age | Savings Target (× salary) | Typical Average Balance |
|---|---|---|
| 30 | 1× | ~$30,000 |
| 40 | 3× | ~$75,000 |
| 50 | 6× | ~$170,000 |
| 60 | 8× | ~$300,000 |
| 67 | 10× | ~$430,000+ |
If you're behind these numbers, don't panic, medians are far lower than averages, and the catch-up contribution exists precisely to help those over 50 accelerate. The best time to start was yesterday; the second-best time is with your next paycheck.
The 15% rule is a starting point, not gospel. Adjust it when:
Because of compound interest, time is more powerful than amount. A 25-year-old who invests $300/month until 65 (at a 7% average return) ends up with roughly $720,000. A 35-year-old who invests the same $300/month ends with about $340,000, less than half, despite contributing for 30 of the 40 years. The extra decade of compounding does the heavy lifting. See it for yourself with the Compound Interest Calculator.
Use the future value formula in two parts. Compound the existing balance as Balance x (1 + r)^n, then compound the stream of contributions as Contribution x (((1 + r)^n - 1) / r). Here r is your annual return divided by 12 and n is the total number of months. Add the two results together.
Starting from $50,000 and adding $500 a month at a 7% annual return, the balance reaches about $106,700 after 5 years. Roughly $30,000 of that is new contributions and the remainder is the original balance plus compounding.
The same $50,000 starting balance with $500 monthly contributions at 7% grows to roughly $462,400 over 20 years. Contributions total $120,000, so most of the ending balance comes from growth rather than deposits.
About $1,015,800, assuming a $50,000 starting balance, $500 contributed every month, and a 7% average annual return. You would have paid in $180,000 across those 30 years, so compounding supplies the other $785,800.
There is no fixed annual figure, because returns vary and your balance keeps rising. As a planning assumption, many people model 6% to 7% a year after inflation-adjusted long-run equity returns. The dollar growth increases every year even at a flat rate, because the percentage applies to a larger balance.
Yes, and significantly. Treat the match as an additional monthly contribution. If you add $500 and your employer matches 50% of that, model $750 a month instead. On the 30 year example above, that lifts the ending balance by roughly $305,000.
Pick a rate you can defend and then test lower ones. A 7% nominal assumption is common for a stock-heavy allocation. Running the same projection at 5% shows how much of your plan depends on the market cooperating, which matters more as you approach retirement.
Because the exponent in the formula is time, not dollars. Ten years of growth applies to every dollar already in the account. Someone who contributes for 10 years and then stops often finishes ahead of someone who starts 10 years later and contributes for 30.
Start by grabbing every dollar of your employer match, then work toward 15% by nudging your contribution up 1% a year. Let compounding and time do the rest. Model your own numbers with the 401(k) Calculator and the Retirement Calculator, a few minutes today can be worth six figures at retirement.
This article is for educational purposes only and is not financial advice. See our Disclaimer.