Your 401(k) contribution limit for 2025 is $23,500, up from $22,500 last year.
If you're 50 or older, you can add another $7,500 as a catch-up contribution, bringing your total to $31,000.
But here's where people slip up: that $23,500 cap applies only to what you personally defer from your paycheck.
Your employer's match doesn't count against it.
So if your company kicks in 4% of your salary, you can still contribute the full $23,500 on your own.
A lot of workers assume the match eats into their limit and accidentally leave money on the table.
There's a separate, much higher ceiling that does include employer money — $70,000 for 2025.
That number matters if you work somewhere with profit-sharing or a generous match.
Someone earning $150,000 with a 10% employer contribution could hit that combined cap well before maxing out their own deferrals, which means free money left unclaimed if they stop contributing too early in the year.
The catch-up rules got a twist this year too.
If you're between 50 and 59 and earned more than $145,000 last year, your catch-up contribution has to go into a Roth account — after-tax dollars, no upfront deduction.
Workers 60 through 63 get a bigger catch-up of $11,250, a special bump Congress added for that age window.
Why does any of this matter for a normal household budget?
Because the tax break is real and immediate.
Every dollar you defer lowers your taxable income now.
Someone in the 22% bracket who maxes out saves roughly $5,170 in federal taxes for the year — money that stays in your pocket instead of going to the IRS.
The practical move most people miss is simple: check your payroll percentage instead of guessing.
If you got a raise in January and never updated your deferral, you might be contributing less than you think.
Log into your plan's website, look at the dollar amount per paycheck, and multiply by the number of paychecks left this year.
If you're on pace to fall short, nudging your percentage up by one or two points for the rest of the year often closes the gap without much pain.
Also worth checking: whether your plan offers an automatic escalation feature.
Many employers will bump your contribution by 1% each year unless you opt out.
It's a quiet way to creep toward the limit without feeling the pinch all at once.
One caution — front-loading everything in January sounds smart, but if your employer matches per paycheck, you could miss out on match dollars in months when you're not contributing.
Spread it out unless your plan does a true-up at year-end.
Our take: the contribution limit is one of the few numbers in personal finance that rewards you for paying attention.
Most people never adjust their deferral after their first week on the job, then wonder at retirement why the balance looks thin.
Final Thoughts
Ten minutes on your plan's website this week is worth more than most financial advice you'll pay for.