It might be best to e-file your Form 1040 now without the adjustment to avoid any delays in your refund. And then file 1040X later after the original return has been processed. Please see FAQ How to amend a tax return for instructions.
You will have to file a paper return to include all documents from the Department of Veterans Affairs and any information received from Defense Finance and Accounting Services explaining proper tax treatment for the current year.
Please see IRS Special Tax Considerations for Veterans for more details.
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