For 2027, an employee can defer up to $25,500 into a 401(k) under IRC §402(g)(1), up from $24,500 for 2026. The IRS set the 2027 figures in Notice 2026-66.  A participant aged 50 or over can defer up to $34,000. A participant aged 60 through 63 can defer up to $37,250 ($25,500 + $11,750). Employees whose wages exceed the threshold must make their catch-up contributions as Roth contributions. The threshold rises to $155,000 for 2027, up from $150,000.

For 2027, the IRA contribution limit stays at $7,500. The IRA catch-up for those aged 50 and over stays at $1,100, so the total for that group is $8,600. These figures are from IRS Notice 2026-66.