Home/PostalMag/Postal TSP/TSP Rates of Return February 2019 Postal TSP TSP Rates of Return February 2019 PostalMag · Saturday, March 09, 2019 All Thrift Savings Plan funds, except the F Fund, posted positive gains for February 2019. The gains over the last two months have put all funds (except the I Fund) back into positive territory for the last twelve months.