The IRS has raised the 2027 401(k) employee deferral limit to $25,500, up from $24,500, with catch-up contributions rising to $8,500 for savers 50 and older and $11,750 for ages 60 to 63, while the IRA limit stays at $7,500. Experts advise capturing your full employer match and updating your savings rate in December to max out by January.