@Arneoker
Preparation / recognition of the "pension" income ( I am assuming that you received the amount in 2025 calendar year) can be done using TurboTax. I am quite biased towards using the Windows downloaded version -- every thing stays on my machine and I can use the forms mode to see how the forms are being filled out / make changes to the worksheets if needed --plus I am quite unfamiliar with the on-line product.
If , however the amount was constructively received during 2024, then you will have to amend your 2024 return to recognize the income.
Assuming 2025 receipt, an estimated payment can be made -- you can use 2024 TurboTax to create the estimated payments for the 2025. Don't forget this income may also be taxable income to your state of residence.
If the monies rested in a foreign bank account that you own or have signature authority over, you may come under FBAR ( form 114 at FinCen.gov and ONLY on line ) and FATCA ( form 8938 along with your return ). Thresholds for filing these are here -- Comparison of Form 8938 and FBAR requirements | Internal Revenue Service
Is there more I can do for you ?
