I received a 1099-R ($16445.67) from a defined benefit pension plan and rolled it into a Govt TSP plan, although the rollover was not received by TSP until Jan. 2017.

[a_p_technician]

What (if any) are my tax implications?

[MichaelL1 · Accepted solution]

As long as the roll-over took place within the 60 days it will be non-taxable to you, as long it went from the Traditional (non-Roth) to the Traditional (non-Roth) TSP.  And yes, it is shown on the 2016 return. 

You will still have to account for it on the tax return.

 To enter pension and annuity Payments (1099-R)

• Click on Federal Taxes (Personal using Home and Business)
• Click on Wages and Income (Personal Income using Home and Business)
• Click on I'll choose what I work on (if shown)
• Scroll down to Retirement Plans and Social Security
• On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button

[a_p_technician]

Thank you for clarifying!