If you believe someone is committing tax fraud, complete and send Form 3949-A to the IRS. Print and mail the form to Internal Revenue Service, PO Box 3801, Ogden, UT 84409
Refer to How Do You Report Suspected Tax Fraud Activity?
Additionally, you and your fiancé can file income tax returns, claiming yourselves. The IRS will send you and your fiancé’s brother notices telling you the same person has been claimed on two tax returns. They will ask both of you if you made a mistake and want to amend your return. If neither you of sends in an amended return then the IRS will ask for proof of support. Send in copies of your rent payments and other documents and receipts showing you support yourself. The IRS will then decide whether you were a dependent or not. Since you did not get a refund or stimulus, there will be no penalty for you if your claim is denied.
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