Notice Type
A 4883C letter means the IRS needs to verify your identity before it will continue processing a tax return filed under your name. It doesn't mean there's a balance due — the IRS may have flagged the return through its identity theft filters, and processing is paused until you verify who you are, and this type of notice often fits within our standard $45 notice review as a starting point, since it usually begins with understanding what the letter is asking for and confirming the details match your situation.
Before You Respond
A 4883C means the IRS has paused processing your return until your identity is confirmed, so responding promptly is what allows your return, and any refund, to move forward. Check your actual letter for the specific verification method it requests and any timeframe mentioned — 4883C letters vary in exactly what's required, and that's what determines your next step, not a general rule of thumb. If the letter goes unanswered, the IRS will not continue processing the return, which can delay any refund indefinitely. Responding as directed, once you've confirmed the letter is legitimate, keeps your return moving.
Know Before You Act
Before responding, it helps to understand two things: whether this letter is legitimate and actually from the IRS, and whether the return it references is one you actually filed. The IRS sends 4883C letters as a precaution, and most of the time the taxpayer did file the return in question. But there can also be cases where the return wasn't filed by the taxpayer, which points to something different than a simple mix-up. Knowing which of these applies to your situation is what determines the right next step.
Start with a secure notice upload and a free IRS notice summary. If you want organized next steps, optional $45 Review & Guidance is a one-time purchase with no subscription. It may include an Action Plan, records to gather, response options, and case questions. When the information and supporting documents provided support a written IRS response, you can use the action steps provided to prepare it yourself or unlock the option for Think Twice Tax to draft a personalized response letter for you.