Getting a letter from the IRS can feel overwhelming, especially when it’s a notice like 5071C, 4883C, or 12C. But don’t panic—these letters are common and every year, thousands of taxpayers receive them for routine reasons. Here’s a straightforward, step-by-step guide to understanding these IRS letters and resolving them quickly.

What Do These IRS Letters Mean?
- 5071C:Â The IRS suspects there may be identity theft. They want you to verify your identity before processing your tax return or issuing your refund. This usually happens if the IRS spots unusual activity or discrepancies on your tax return.
- 4883C: Similar to 5071C, this letter requires you to verify your identity, generally by calling a special IRS phone number. It’s also used to combat identity theft and fraud.
- 12C: This letter indicates there’s missing or incomplete information on your tax return, such as forms or schedules, and you need to provide more details for the IRS to process your return.
Step-by-Step: How to Handle Each Letter
Step 1 – Read the Letter Carefully
- Pay attention to the instructions, deadlines, and required documents.
- Never respond to IRS letters by email or to phone numbers not listed on the official letter.
Step 2 – Gather the Necessary Documents
For 5071C/4883C:
- Most recent tax return and the return in question
- W-2s, 1099s, or other income documents
- Valid government-issued photo ID
For 12C:
- Missing or corrected tax forms, schedules, or additional documentation requested by the IRS
Step 3 – Respond Promptly Using IRS-Approved Methods
- 5071C:
- Go to idverify.irs.gov to verify your identity online using your letter’s 14-digit control number and recent tax documents.
- Alternatively, use the specific toll-free IRS number listed on your letter.
- 4883C:
- Call the phone number on your notice. Have your tax documents and ID ready for verification when you call.
- 12C:
- Mail or fax the missing documents or forms, using the address or fax number on the letter.
Step 4 – Wait for IRS Confirmation
- Most issues resolve within weeks if you respond promptly.
- The IRS will process your return and release your refund if all information checks out.
- For identity verification, you may need to check your IRS account or wait for follow-up.
Step 5 – Know When to Seek Help
- If you didn’t file the tax return cited or suspect fraud, report it to the IRS immediately.
- If you’re confused or worried about your response, consult a tax professional for help.
IRS letters like 5071C, 4883C, and 12C are not the end of the world. Act promptly, follow the steps in your notice, and you’ll get your tax return back on track!
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