Any pension contributions that are required by TRS, but are not made, would result in a "deficit." Because this deficit represents contributions that should have been made by a TRS member, it is known as a "membership service deficit."

If you have a membership service deficit, TRS will send you a Cost Letter; payment for deficits is mandatory. Your letter will specify the amount due, available payment options, and any consequences that may result if you do not respond by the deadline indicated (e.g., you may be placed automatically on a payment plan of payroll deductions, if eligible).