Fedweek

Employees may invest in the TSP by percentage of salary or by dollar amount per pay period. Regular investments continue unless changed year-to-year, meaning that employees making investments based on a percentage of salary will see their investment rates go up automatically effective with the first full pay period. Those making investments based on a dollar amount per pay period might wish to consider increasing that amount, especially if they are under FERS and would not capture as much of a matching government contribution, which is based on the percentage of salary the employee invests.