The IRS has confirmed new 401(k) contribution limits for 2025, and the number moved up again.
Employees can now defer up to $23,500 into a workplace retirement plan, up from $22,500 in 2024.
Catch-up contributions for savers 50 and older stay at $7,500, but a new "super catch-up" lets workers aged 60 through 63 stash an extra $11,250 instead.
That last detail is the one most people will miss.
If you fall into that four-year window, the government is effectively handing you a bigger tax shelter than your older and younger coworkers get.
It exists because lawmakers wanted to help people nearing retirement who fell behind, but it only helps if you actually change your payroll election.
Someone earning $70,000 who bumps their deferral from 10% to 12% would set aside roughly $8,400 a year instead of $7,000.
That's an extra $1,400 working for them instead of sitting in a checking account losing ground to grocery bills and rent.
Every extra dollar into a traditional 401(k) lowers your taxable income now, so your take-home pay drops by less than the amount you contribute.
A $100 increase in deferrals might only shrink your paycheck by $75 or $80, depending on your tax bracket.
That math is why financial planners keep pushing people to raise contributions right after a raise, when the sting is easiest to absorb.
But there's a catch that's tripping up higher earners.
A provision in the SECURE 2.0 law requires catch-up contributions to be made as Roth (after-tax) contributions for workers whose prior-year wages exceeded $145,000.
The IRS delayed enforcing that rule, but it's now in effect.
If you're a high earner planning to use the catch-up, check with your plan administrator before December, or you may find your payroll deduction rejected.
Employer matching also deserves a second look.
Many companies match a percentage of your salary, not a flat dollar amount, so a raise or a limit increase quietly raises the match ceiling too.
If your employer matches 50% of contributions up to 6% of pay, hitting that 6% is free money.
Missing it is the single most common and most expensive retirement mistake.
For 2026, the deferral limit is already set to rise again to $24,500, so this is not a one-time bump.
Contribution limits tend to climb with inflation, which means the gap between people who adjust their payroll settings and people who never touch them grows wider every year. **The bottom line:** A limit increase only matters if you act on it.
Log into your plan portal, check your current deferral percentage, and decide whether this is the year you push it up by one or two points.
Final Thoughts
Even a small bump compounds for decades, and the paycheck difference is usually smaller than people fear.