Did you receive a VA Determination letter after you retired? If so, see this IRS website for information - https://www.irs.gov/individuals/military/special-tax-considerations-for-veterans
Under normal circumstances, the Form 1099-R issued to the veteran by Defense Finance and Accounting Services correctly reflects the taxable portion of compensation received. No amended returns would be required, since it has already been adjusted for any non-taxable awards.
If needed, veterans should seek assistance from a competent tax professional before filing amended returns based on a disability determination. Refund claims based on an incorrect interpretation of the tax law could subject the veteran to interest and/or penalty charges.
You should seek assistance from a local qualified tax professional in your area if you are going to amend your prior year tax returns.
