In Massachusetts, federal TSP distributions to a retiree are fully taxable in the year paid. Scroll down to "Federal Employee Thrift Savings Plan" in this reference for details:
https://www.mass.gov/service-details/view-government-pensions#:~:text=Income%20earned%20on%20the%20c....
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
