Notice code Letter 12C
IRS Letter 12C: Your Return Is on Hold Until You Send the Missing Items
Taxpayers in your state with IRS Letter 12C have 20 days to send the missing items, or the return and any refund stay stuck.
Call now and a licensed tax pro goes through your letter for free and starts your reply today.
We answer your call around the clock, go through your Letter 12C for free, and start your reply right away.
The IRS needs missing information before it can finish processing your return.
Send the requested items within 20 days, even if you disagree with the letter.
- Send the missing forms or proof to the address on the letter.
- Reply in writing to explain anything you disagree with.
- Call us if any item on the letter is unclear.
The IRS wants the missing items within 20 days, so mail everything the letter asks for before that time passes.
Any refund comes about 6 to 8 weeks after the IRS gets your reply, so send your reply early.
An amended return is the wrong move here, so answer the letter itself instead of filing Form 1040-X.
Get Your Letter 12C Answered Today
Your return and any refund stay on hold until the IRS gets what Letter 12C asks for.
A licensed tax pro for taxpayers in your state goes through your letter for free and starts your reply today.
Call now and talk to a licensed tax pro who answers around the clock.
We answer your call around the clock, go through your Letter 12C for free, and start your reply right away.
Send Us Your Letter 12C Details
What is IRS Letter 12C saying?
This letter means the IRS needs more information before it can process your return. It names exactly what is missing.
It might ask for a schedule, a form backing up an entry, proof of income or withholding, or a check of a Social Security number. No payment is asked for.
Why did you get Letter 12C?
Something on your return could not be matched or was not backed up. A common cause is a credit claimed without the form that supports it.
This letter is not an audit. It asks for missing items so the IRS can finish processing your return.
Is your Letter 12C real?
You can confirm the letter is real by looking up its code on the IRS notice and letter page. A real letter lists exactly what to send and where to send it.
A real version of this letter does not ask for payment. Our licensed tax pro can also confirm it is real when you call. See how to check an IRS letter for warning signs.
When is your Letter 12C deadline?
The IRS says to send the information within 20 days, according to its Letter 12C guide. Reply even if you disagree, and say what you disagree with.
Any refund goes out about 6 to 8 weeks after the IRS receives your reply. Use the count my days tool to find your date.
Since September 30, 2025, the IRS has stopped sending paper refund checks to individual taxpayers, with limited exceptions. Refunds now go out electronically, mainly by direct deposit.
What if you agree with Letter 12C?
Send the missing forms or proof to the address on the letter. Do not file Form 1040-X, because the IRS says to answer the letter itself.
Our licensed tax pro can check that your reply covers every item before it goes out.
What if you don't agree with Letter 12C?
Reply anyway with a clear written explanation of what you disagree with. Silence holds up your return and any refund.
A licensed tax pro can help you word your reply and gather the proof that backs you up.
What happens if you ignore Letter 12C?
Your return stays unprocessed, and any refund waits. The problem does not clear up on its own.
Call us today and a licensed tax pro starts your reply right away.
What to read next
Questions people ask
How long does Letter 12C take after I reply?
The IRS says it sends any refund due about 6 to 8 weeks after it receives your response.
Should I file an amended return for Letter 12C?
No. The IRS says not to file Form 1040-X, so answer the letter itself.
What if I disagree with Letter 12C?
Reply within 20 days anyway and explain in writing what you disagree with.
Is Letter 12C an audit?
No. It asks for missing items so the IRS can finish processing your return.
Where this comes from
What to do now
- Call us so a licensed tax pro can go through your letter for free.
- Read the letter and list every item it asks for.
- Gather the missing schedules, forms, or proof of income and withholding.
- Mail everything to the address on the letter before 20 days pass, and do not file Form 1040-X.
We answer your call around the clock, go through your Letter 12C for free, and start your reply right away.
Confirmed 23 Aug 2026