I got a 4883C letter from the IRS
If you got a letter from the IRS, don’t worry. We’ll do our best to help you figure out what to do next.
The 4883C letter means that the IRS received your tax return but needs more information to process it accurately.
You’ll need to call the IRS toll-free on 800-830-5084 for Identity Verification and have a copy of your prior year tax return, current return, and supporting documents like W-2s, 1099s, Schedule C etc.