Can uniformed services retirees contribute to the TSP?
Uniformed services retirees cannot contribute to the TSP. Only pay for service (i.e., basic pay, incentive pay, and special pay, including bonuses) can be contributed to the TSP. The TSP is designed to allow active duty members and members of the Ready Reserve to save a part of their military pay for retirement in a plan that offers pre-tax savings, tax-deferred investment earnings, and low administrative and investment expenses.