There are a number of reasons the IRS would send you a 4883c letter, to include selecting you at random.
For whatever reason you were selected, they won't process your return until you comply with the letter.
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.
There are a number of reasons the IRS would send you a 4883c letter, to include selecting you at random.
For whatever reason you were selected, they won't process your return until you comply with the letter.
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.