Also note - https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-401k-and-profit-sha...
Catch-up contributions for those age 50 and over
If permitted by the 401(k) plan, participants age 50 or over at the end of the calendar year can also make catch-up contributions. You may contribute additional elective salary deferrals of:
- $6,500 in 2021 and 2020 and $6,000 in 2019 - 2015 to traditional and safe harbor 401(k) plans
- $3,000 in 2021 - 2015 to SIMPLE 401(k) plans
- These amounts are subject to cost-of-living PDF adjustments
You don’t need to be “behind” in your plan contributions in order to be eligible to make these additional elective deferrals.
