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Amending a 1042-S to Add a Missing U.S. Tax ID
January 8, 2026
Q. An individual has reached out asking to amend their 1042-S form to add in their US tax ID, which they did not provide on their W8 years ago, when we made payment to them.
They stated they need the tax ID added in order to be able to claim a refund from the IRS as they were issued a disallowance letter. Is it ok now to amend their 2023 1042-S form with their added US tax ID?
A.
(Answered by IOFM's third-party tax expert)
Yes, you could amend now. You won't need to say anything to the IRS when…
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