Can You Fax Form 8379? (IRS Injured Spouse Allocation)

Form 8379, "Injured Spouse Allocation," lets a spouse recover their share of a joint tax refund when the IRS has applied — or will apply — that refund to the other spouse’s past-due, legally enforceable debt. Those debts include past-due federal tax, state income tax, child or spousal support, and federal non-tax debts such as a defaulted student loan. You are the "injured spouse" if you filed jointly, you reported income (or made payments) on the joint return, and you are not legally responsible for the past-due amount that the refund was taken to cover.

It is important not to confuse Form 8379 with Form 8857, "Request for Innocent Spouse Relief." Injured spouse relief (8379) is about protecting your share of a refund from your spouse’s separate debt. Innocent spouse relief (8857) is about being relieved of responsibility for tax, interest, and penalties your spouse improperly caused — a different situation with a different form and process. If your refund was offset for your spouse’s debt, Form 8379 is the one you want.

There are three filing scenarios, and all of them involve e-filing or mail — not fax. First, you can file Form 8379 with your original joint return. Attach it to the return and file everything together; most e-file software includes Form 8379, and filing it up front tells the IRS to protect your share before the refund is offset. When you file it with your return, write "INJURED SPOUSE" in the upper left corner of the return per the instructions.

Second, you can file it with a Form 1040-X amended return if you are amending. Third — and this is the most common reason people go looking for a fax number — you can file Form 8379 by itself after your joint return has already been processed and the refund has been (or is about to be) offset. In that case, you mail the standalone Form 8379 to the IRS service center where you filed your original return. If your original joint return was e-filed, you mail the standalone form to the service center for your area. Include copies of both spouses’ Forms W-2 and any 1099s showing withholding, so the IRS can verify the allocation.

Whichever scenario applies, the destination is a mailing address, and the correct one is listed in your Form 1040 instructions and on the IRS "Where to File Paper Tax Returns" page for your state. Because the IRS does not fax-accept this form, mailing (or attaching to an e-filed return) is the only way to submit it.

On Form 8379 you allocate the joint return’s income, adjustments, deductions, credits, and payments between the two spouses, so the IRS can compute how much of the refund belongs to the injured spouse. Community-property states follow special rules, which the form’s instructions describe; the allocation there is based on state community-property law rather than a simple split. Take care with the withholding and estimated-payment lines, since those directly determine your protected share.

You must file Form 8379 within three years from the due date of the original return (including extensions), or within two years from the date you paid the tax that was later offset — whichever is later. Filing promptly after you learn of an offset (the Treasury’s Bureau of the Fiscal Service sends an offset notice) is the best way to recover your share without unnecessary delay.

Injured spouse claims take time to process. As a general guide, the IRS asks filers to allow about 14 weeks when Form 8379 is filed on paper with a joint return, about 11 weeks when it is filed electronically with the return, and about 8 weeks when it is filed by itself after the return was already processed. These are estimates and can be longer during busy periods. Filing electronically with your return is the fastest path.

If it has been longer than the expected timeframe, you can check on your claim by contacting the IRS. Keep a complete copy of the Form 8379 and the supporting W-2s and 1099s you sent, along with your mailing receipt, so you have a record of when and where you filed.