Federal Retirement Thrift Investment Board (TSP)

The Federal Retirement Thrift Investment Board administers the Thrift Savings Plan (TSP), a tax-deferred defined contribution plan which provides Federal employees the opportunity to save for additional retirement security. In the nearly thirty years since the TSP received the first civilian contributions, it has expanded to cover members of the uniformed services (largely voluntary, non-matched contributions) and spousal beneficiaries. It is now the largest defined contribution retirement plan in the US.