Extra retirement-account contributions allowed once you reach age 50.
Starting in the year you turn 50, the IRS lets you contribute above the standard annual limit to 401(k)s and IRAs, helping those behind on savings make up ground in their highest-earning years. The catch-up amounts are set by the IRS and adjust over time. They stack on top of the regular limit.
A 52-year-old can add catch-up dollars to a 401(k) beyond the standard contribution cap.