See https://www.irs.gov/individuals/military/special-tax-considerations-for-veterans for guidance. Note that you will have to mail the amended return. If this is for 2021 taxes, then *you* can adjust the 1099-R yourself, ***AND*** then you will still have to mail the return since you have to include the VA paperwork with the return. Processing will take longer since it has to be done by hand.
