I receive an AT&T pension, managed by Fidelity Investments. In 2017 we spent a great deal of our time in Costa Rica. We still maintained a US address. We are considering residency in CR and found out we needed to show a minimum of $1000/mo deposited in a CR bank. Through the US embassy I requested and received my Social Security check via EFT to a Costa Rica Bank. To do so I needed to provide a CR PO Box. Somehow through SSA, AT&T was given my CR PO Box, which provided it on to Fidelity. For two months I had a 30% tax withheld from by pension check as an NRA. I called and confirmed my US address with Fidelity and at their request provided a W9 with the same address they had all along. When I received my Tax documents for 1017 Fidelity gave me a 1099-R for 10 months and a 1042-S for 2 months, which shows the massive 30% deduction in box 7A. I was born, and worked my entire live in the US. According to the IRS codes I read, I could NEVER be a NON-Resident-Alien.
You can enter your 1042-S related to your pension distribution and your related withholdings under the 1099-R section in TurboTax. You need to check the box for the option that "I need to prepare a substitute 1099-R" on the screen Tell Us Which 1099-R You Have. As it is a substitute1099-R (Form 4852), you will need to provide an explanation and mail your return along with your filing copy of the 1042-S,
You will find the 1099-R under Wages & Income, scrolling down to the section IRA, 401(k), Pension Plan Withdrawals (1099-R).