IRS Letter 12C
Information Needed to Process Your Tax Return
Your return is on hold. The IRS needs a specific document before they can finish processing it.
Deadline
Respond by the date on the letter — typically 20 days
If you don't respond, the IRS cannot process your return. Your refund will remain frozen and the IRS may propose adjustments or disallow items they cannot verify.
Important — act before this escalates.
What IRS Letter 12C Means
Letter 12C means the IRS received your tax return but cannot finish processing it because specific information or documentation is missing. This is a processing hold — not an audit — and it typically resolves quickly once you provide what the IRS is asking for.
Common triggers include missing Form 8962 (Premium Tax Credit reconciliation) for taxpayers who had ACA marketplace insurance, missing signature pages, questions about estimated tax payments, or documentation needed to verify a specific credit or deduction.
The letter will specify exactly what document, form, or information is needed. Read it carefully and provide precisely what is requested — no more, no less.
What the IRS Can Do If You Don't Respond
- Hold your entire tax return and refund until the information is received
- Disallow specific items they cannot verify if you don't respond
- Assess additional tax if a credit is disallowed due to non-response
What You Should Do Right Now
- 1
Read the letter carefully and identify exactly what is being requested
- 2
Gather and send only what is specifically requested — do not send extra documents
- 3
Respond by the date on the letter to avoid further delays
- 4
Keep copies of everything you send
- 5
If the request is for Form 8962 (ACA), reconcile your advance premium tax credits using Form 1095-A
Resolution Options Available to You
Frequently Asked Questions About IRS Letter 12C
Why did I get Letter 12C?
Most commonly because you had ACA marketplace health insurance and did not include Form 8962 to reconcile your premium tax credits. Other causes include missing signatures, unclear entries, or documentation needed for specific credits.
Will I still get my refund after responding to 12C?
Yes, assuming the information you provide confirms your eligibility. After the IRS receives and reviews your response, processing typically takes 6–8 weeks.
Professional References
IRC: IRC §36B — Premium Tax Credit; IRC §6011 — Required Returns
IRM: IRM 3.11.3 — Returns and Documents Analysis — Missing Information
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