@insurance_engineering
Yeah, IRS requests to see the actual 1099-R forms, happens, but is quite rare.
Usually, it happens when the Federal withholding you reported doesn't match their own data....or when a provider (probably for the 1099-R) didn't send in their own reports on time, and the IRS has no record of those withholding $$ in your name and SSN from whoever issued the 1099-R to you (the IRS gets separate withholding e-records from the issuer).
Other than that, you could just have been one of the 0.1% of tax filers that got hit with a random check.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
