Do i need to claim contributions to a government tsp retirement

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If you have a 401(k) or TSP through your employer, your contribution is reported in Box 12 of your W-2 with the letter code D.

Because your contribution is included in your W-2, do not re-enter it in the retirement section.

See Where do I enter my 401(k) or Thrift Savings Plan (TSP) contribution?

https://ttlc.intuit.com/questions/1901283-where-do-i-enter-my-401-k-or-thrift-savings-plan-tsp-...