A 401(k) is the main way most people build retirement wealth, but the question of how much to put in trips people up. The answer comes in layers: a floor you should never go below, a target to build toward, and the pleasant surprise of how little a contribution actually costs your take-home pay.
Here is how to set your number.
First, capture the full match
If your employer matches contributions, that match is free money and an instant, guaranteed return, often 50 to 100 percent, that no investment can beat. The non-negotiable floor is contributing at least enough to get every dollar of the match. Anything less is turning down part of your pay.
See what capturing the full match is worth over a career above; the number is usually far larger than the modest amount you contribute to unlock it.
Then aim for a target rate
Beyond the match, a common goal is saving around 15 percent of your income for retirement, including the employer's contribution. If you cannot get there immediately, that is fine, start where you can and raise your rate by a percentage point whenever your pay increases. Many plans will do this automatically if you turn on auto-escalation.
Why it costs less than you think
Traditional 401(k) contributions come out of your pay before tax, so putting in a dollar lowers your take-home by less than a dollar. Contribute $200 in a 22 percent bracket and your paycheck drops only about $156, the government effectively covers the rest by lowering your tax. That discount is why saving in a 401(k) is more affordable than the raw numbers suggest.
There is an annual contribution limit, and it rises over time, with extra catch-up room after age 50. High earners aiming to save aggressively should make sure they are on track to use it.
If your budget is tight, start at the match, automate an annual increase, and let time and compounding do the rest.
Frequently asked questions
How much should I contribute to my 401(k)?
At a minimum, enough to capture the full employer match. Beyond that, aim toward saving around 15 percent of income including the match, raising your rate over time if you cannot get there at once.
Is the 401(k) match really free money?
Yes. An employer match is an immediate, guaranteed return, often 50 to 100 percent of what you contribute, that no investment offers. Not capturing it is like declining part of your salary.
How much does a 401(k) contribution lower my paycheck?
Less than the amount contributed, because traditional contributions are pre-tax. A $200 contribution in a 22 percent bracket lowers take-home by about $156.
What if I cannot afford to contribute much?
Start with at least the match, then turn on automatic annual increases so your rate rises painlessly with your pay. Consistency and time matter more than a big initial amount.
Put your own numbers in.
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