Actively employed TSP participants age 50 and older can make TSP catch-up contributions of an amount ($6,500 in 2021) above the elective deferral limit amount ($19,500 in 2021). Catch-up investments can be made under either the traditional TSP design or under its Roth design or both, so long as the total amount invested is within the catch-up limit.
TSP Catch-Up Contributions Eligibility
To be eligible a participant must be in pay status (that is, not on leave without pay, retired or otherwise separated) and must be at least 50 years old by the end of the year.
Effective in calendar year 2021 no election is necessary; for those eligible to make catch-up contributions, any investments beyond the standard limit “spill over”—they are automatically designated as catch-up contributions, up to that limit. Through 2020, those wishing to make catch-up contributions had to specifically elect to make them.