You do not report the contribution amount into the Thrift Savings plan. The contribution is already reported for you in the W2. It is a pre-taxed contribution for you as it is excluded from Box 1 wages from your W2.
When you go to federal>deductions and credits>retirement and investments>traditional Roth IRA Contributions, you will only report the amount of the IRA contribution and not the contribution into the Thrift Savings plan.
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