Where to Fax Form 8962 (Reply to IRS Letter 0012C)
Form 8962 has no standalone fax line. Nearly everyone who faxes it is answering IRS Letter 0012C — and the correct fax number is printed on that letter. Here is exactly what to fax and how to respond on time.
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Fax numbers and addresses were last verified July 17, 2026. The IRS can change them at any time — always confirm against the official source: IRS.gov — Understanding Your Letter 0012C.
You fax Form 8962 to the number on IRS Letter 0012C — not a general line
There is no standalone "Form 8962 fax number." In normal filing, Form 8962 is attached to your Form 1040 and e-filed or mailed with the return — it is never faxed on its own. The reason people search for a fax number is that the IRS held their return and sent Letter 0012C (also written "Letter 12C") asking them to complete Form 8962 and reconcile their advance premium tax credit.
That letter is the source of the correct fax number. Its response instructions print a case-specific fax number (and a mailing address) for your reply. Fax your Form 8962, your Form 1095-A, and a copy of the letter to the number on the letter — generally within 20 days — and your return continues processing. Use the guidance below to assemble the response correctly.
All Form 8962 fax numbers and mailing addresses
Every destination is listed below so you can confirm yours directly.
The fax number printed on your IRS Letter 0012C
Fax number
From your IRS notice or letter
Form 8962 does not have its own public fax number. When the IRS asks for it, it is almost always in Letter 0012C (Letter 12C), which prints a case-specific fax number in its response instructions. Fax your completed Form 8962, your Form 1095-A, and a copy of the letter to that number within 20 days. If you prefer, you can mail the same package to the address on the letter instead.
What Form 8962 is and who files it
Form 8962, "Premium Tax Credit (PTC)," reconciles the health-insurance subsidy you may have received through the Health Insurance Marketplace (healthcare.gov or a state exchange). If you or a family member had Marketplace coverage, you likely received advance payments of the premium tax credit (APTC) that lowered your monthly premiums. Form 8962 compares those advance payments against the actual credit you qualify for based on your final household income and family size for the year. If you received too little, the difference increases your refund; if you received too much, you may have to repay some or all of it.
Anyone who had Marketplace coverage with advance credit payments, or who wants to claim the premium tax credit, must file Form 8962 with their tax return. The figures on the form come directly from Form 1095-A, "Health Insurance Marketplace Statement," which the Marketplace sends you (and the IRS) after the end of the year. Because the IRS receives a copy of every 1095-A, it can tell when a return that should include Form 8962 is missing it.
Why you got IRS Letter 0012C
When the IRS has a record that you (or a dependent) had Marketplace coverage with advance premium tax credit payments, but the filed return does not include a completed Form 8962, the IRS holds the return and sends Letter 0012C (Letter 12C) asking for the missing information. The letter explains that the IRS needs your Form 8962 and a copy of your Form 1095-A before it can finish processing the return — and, if you are due a refund, before it can release it.
The letter is time-sensitive: it generally asks you to respond within 20 days. It also tells you not to file an amended return (Form 1040-X) in response — you simply send the requested documents. Because the letter is tied to your specific return, it prints the exact fax number and mailing address to use for your reply. That printed fax number is the answer to "where do I fax Form 8962": it is on your letter, not on any general IRS fax list.
Exactly what to fax in reply to Letter 0012C
Assemble a single fax package containing three things: (1) a completed Form 8962 for the tax year in the letter, (2) a copy of the Form 1095-A the Marketplace sent you for that year, and (3) a copy of the Letter 0012C itself, used as the first page so the IRS can match your response to your account. If the letter asks for anything else — for example, a corrected Form 1040 page 2, or a specific worksheet — include that too.
Fill out Form 8962 using the monthly and annual amounts from Part III of your Form 1095-A. If you did not receive a 1095-A, or the one you received is wrong, contact the Marketplace to get a correct copy before you respond, because the numbers must match. Double-check that the tax year on your Form 8962 matches the year referenced in the letter — mixing years is a common reason a response gets kicked back.
Then fax the package to the number printed in the letter’s response instructions, and keep your transmission confirmation. If you would rather mail it, the letter also gives a mailing address; faxing is simply faster and gives you immediate proof of the send date, which matters when you are working against the 20-day window.
How Form 8962 is filed the rest of the time
Outside of a Letter 0012C reply, you do not fax Form 8962 at all. When you file your annual return, Form 8962 is simply attached to your Form 1040 and submitted with it — electronically if you e-file (the software builds it from your 1095-A entries) or on paper if you mail your return. E-filing with Form 8962 included is the best way to avoid a 12C letter in the first place, because the reconciliation is already done when the return arrives.
If you already filed without Form 8962 and have not yet received a letter, you generally should not rush to mail a standalone form; wait for the IRS to tell you what it needs, or follow current IRS guidance for your situation. And if the reconciliation changes something substantive after your return was fully processed, that is when an amended return (Form 1040-X) — not a fax — is the right tool.
What to include when you fax Form 8962
- A cover sheet with your name, SSN, the tax year, the Letter 0012C notice date, and a callback number.
- A copy of IRS Letter 0012C as the first page, so the IRS can match your reply to your account.
- A completed Form 8962 for the tax year shown on the letter.
- A copy of your Form 1095-A (Health Insurance Marketplace Statement) for that year.
- Any additional page the letter specifically asks for (for example, a corrected page 2 of Form 1040).
Common mistakes that get Form 8962 rejected or delayed
- Faxing to a random IRS number instead of the fax number printed on your Letter 0012C.
- Leaving out the Form 1095-A — the IRS needs it to verify the Form 8962 figures.
- Filing an amended return (Form 1040-X) in response, which the letter tells you not to do.
- Missing the ~20-day response window, which further delays your refund.
- Using figures from the wrong tax year, or a Form 1095-A that has not been corrected by the Marketplace.
- Forgetting to include a copy of the letter itself as the cover/first page.
After you fax Form 8962
- Keep your fax transmission confirmation as proof you replied within the 20-day window.
- The IRS resumes processing your return once it receives the completed Form 8962 and Form 1095-A; a held refund is released after the reconciliation checks out.
- Processing the response can take several weeks — avoid sending duplicates, which can slow things further.
- If you owe repayment of excess advance credit, that amount is reflected in your final balance or reduced refund.
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Last verified July 17, 2026. Official source: IRS.gov — Understanding Your Letter 0012C