Basics: Traditional vs. Roth

Section 1: Regulatory Context

The choice between Traditional and Roth TSP contributions is governed by Internal Revenue Code (IRC) Section 401(k) and the Enrolled Act of 2010 (Public Law 111-240), which authorized the Roth TSP option. Under these regulations, Traditional contributions are made on a pre-tax basis, reducing current taxable income, while Roth contributions are made on an after-tax basis. All agency automatic (1%) and matching (4%) contributions are required by law to be deposited into the Traditional balance, regardless of the participant’s elective deferral choice. Total combined contributions must not exceed the annual Elective Deferral Limit set by the IRS.

Section 2: If/Then Scenarios

• If a participant anticipates being in a lower marginal tax bracket during retirement than their current bracket, then the Traditional TSP provides a current-year tax deduction, with withdrawals taxed as ordinary income in the future.
• If a participant anticipates being in a higher marginal tax bracket during retirement, then the Roth TSP allows for tax-free qualified distributions, provided the account has been held for five years and the participant is at least 59½ years of age.
• If a participant seeks to hedge against future legislative changes to tax rates, then a proportional allocation between both Traditional and Roth accounts allows for tax diversification within the TSP structure.

Section 3: System Integration

Contribution elections are managed through agency-specific payroll systems, such as Employee Express, MyPay, or GRB Platform. These systems transmit data to the Thrift Line for record-keeping. While the participant may choose different percentages for Traditional and Roth, the total must comply with the aggregate IRS limit. Upon retirement, the TSP-70 (Request for Withdrawal) or the online retirement portal allows for the proportional or specific exhaustion of these separate tax buckets.

Section 4: 3-Step Action Plan

1. Project Future Tax Liability: Evaluate current versus anticipated retirement income levels to determine which tax treatment offers the highest long-term net value.
2. Adjust Payroll Elections: Log into the designated agency payroll portal to specify the percentage or dollar amount allocated to Traditional versus Roth.
3. Monitor Compliance: Review the Annual Personal Statement from the FRTIB to ensure that total contributions remain within IRS limits and that agency matching is being applied correctly to the Traditional balance.