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He currently does not have a home address, he is staying with friends. His mail goes to a P.O.Box but the IRS does not accept that as a form of address. Can he use my (his former) home address (same as on his W2) without it causing issues with the IRS? Thats really my biggest issue. I dont want the IRS come knocking on my door and audit me and or him just because he is basically homeless at the moment