IRS Tax Identification Letter: What CPAs Must Do

A client calls you in a panic: their federal return hasn’t been processed, no refund has hit, and they’re holding a letter from the IRS with a bunch of instructions about ID.me and in-person appointments. That letter is almost certainly IRS Letter 6483C, and if you haven’t dealt with it before, the steps aren’t obvious.

Here’s what it means, what to do, and how to avoid the two mistakes that drag this out for weeks.

What Letter 6483C Actually Says

The IRS sends Letter 6483C when it receives a federal income tax return filed under a client’s SSN or ITIN but cannot confirm the filer’s identity before processing. The letter is part of a pilot program that uses ID.me as an in-person identity verification service.

The practical consequence is severe: the IRS will not process the return, issue a refund, or apply any credit for overpayments until verification is complete. For a client waiting on a five-figure refund, that’s not a minor inconvenience.

The letter also does something that trips people up: the phone numbers printed on it are scoped exclusively to identity and tax-return verification. You cannot call those numbers to check refund status or ask about anything else on the account. Trying to do so just wastes time.

Two Paths, Depending on Whether Your Client Filed

The first thing to establish is simple: did your client actually file the return the letter references?

If your client did not file that return, someone else filed under their SSN or ITIN — meaning this is a potential identity theft situation. The IRS instructs them to call the Taxpayer Protection Program hotline printed on the letter. Do this immediately. Do not wait. Document the call date and the representative’s ID number.

If your client did file the return, the IRS directs them through an identity-verification process using ID.me. The steps are:

1. Create an ID.me account if they don’t already have one.
2. Complete the initial identity-verification questions on the ID.me platform.
3. Schedule an in-person identity verification appointment at an Identity Network Location.

The in-person step is non-negotiable under this pilot. There is no current alternative that bypasses the physical appointment for this specific letter.

Walk Your Client Through the ID.me Process — Don’t Assume They’ll Figure It Out

Most clients over 60, and many below that age, will stall at the ID.me account creation step. Walk them through it during your call or send a clear written checklist. Here’s what they’ll typically need:

• A government-issued photo ID (driver’s license or passport)
• A device with a camera for the initial selfie-based verification
• Access to the email address they’ll register with ID.me

After they clear the online steps, they schedule an in-person appointment. ID.me operates through a network of locations — encourage your client to search for the nearest one immediately, because appointment availability varies by region and can be limited.

Once the appointment is completed and identity is confirmed, the IRS can resume processing. Refund timelines reset from that point, so the sooner verification is done, the better.

The ITIN Wrinkle

If the return was filed under an ITIN rather than an SSN, there’s an additional layer worth knowing. An ITIN is issued specifically for federal tax purposes to individuals who aren’t eligible for an SSN. To apply for or renew one, the client must file Form W-7 (Application for IRS Individual Taxpayer Identification Number) and demonstrate a valid federal tax purpose for the number.

If a client’s ITIN is expired or was recently issued, that can intersect with identity verification flags. IRS Keep this in mind if you’re representing a non-resident alien or a foreign national with U.S. tax obligations — the identity verification process may take longer, and you may need to coordinate Form W-7 renewal alongside resolving the 6483C.

Common Mistakes That Slow This Down

Ignoring the letter hoping it resolves itself. It won’t. Processing is frozen until verification happens. Every week of delay is a week the client doesn’t have their refund.

Using the wrong phone number. The numbers on Letter 6483C handle only identity and tax-return verification for this specific letter. Don’t call them expecting refund status information — you’ll get nowhere.

Assuming online-only verification is sufficient. Under this pilot, ID.me requires an in-person appointment. Completing the online steps and skipping the appointment will not satisfy the IRS requirement.

Failing to document. If the client’s situation later becomes a formal identity theft case, having a paper trail — dates of calls, confirmation numbers from ID.me, appointment receipts — is essential.

How Sagenext Helps

When you’re managing a client’s identity verification crisis, the last thing you need is a software access problem slowing you down. Sagenext hosts Drake, Lacerte, ProSeries, UltraTax, ATX, QuickBooks, and other professional tax and accounting applications on fully managed cloud infrastructure. Your team can pull up any client file from any location, without waiting for someone to be at the office desktop.

For a firm handling multiple 6483C cases simultaneously — which happens during peak season — multi-user access from a remote desktop session means your staff can work the problem in parallel rather than queuing up at one machine. Sagenext handles provisioning, backups, and security so your attention stays on the client issue, not IT. There’s a free trial available with no credit card required if you want to test it with your current software stack. 5 Benefits Of Hosting Drake Tax Software

Key Takeaways

• IRS Letter 6483C freezes return processing, refunds, and credit applications until identity is verified — there is no workaround.
• If the client didn’t file the return referenced in the letter, call the Taxpayer Protection Program hotline on the letter immediately — that’s a potential identity theft situation.
• If the client did file, they must create an ID.me account, complete online verification, and schedule an in-person appointment at an Identity Network Location.
• The phone numbers on Letter 6483C are for identity/return verification only — do not use them to check refund status.
• For ITIN filers, check whether the ITIN is current; expired ITINs require Form W-7 renewal and can compound delays.
• Document every step: call dates, ID.me confirmation numbers, and appointment records protect you and your client if the situation escalates.

Frequently Asked Questions

What triggers IRS Letter 6483C?

The IRS sends Letter 6483C when it receives a federal income tax return filed under a client’s SSN or ITIN and cannot verify the filer’s identity before processing. It’s part of a pilot program using ID.me for in-person identity verification. The letter does not mean the client has done anything wrong — it means the IRS needs additional confirmation before it will process the return or release any refund.

Can my client check their refund status by calling the number on Letter 6483C?

No. The IRS explicitly states that the telephone numbers shown on Letter 6483C handle only identity and tax-return verification matters related to that specific letter. Refund status and other account information are not available through those numbers. Your client should use the IRS Where’s My Refund tool or contact the IRS through a separate channel for refund inquiries.

What happens if my client does nothing after receiving Letter 6483C?

The return stays frozen. The IRS will not process it, will not issue a refund, and will not apply any credit for overpayments until verification is complete. There is no passive resolution path here — the client must actively complete the ID.me verification process, including the in-person appointment, for processing to resume.

What should I do if my client did not file the return mentioned in Letter 6483C?

Call the Taxpayer Protection Program hotline listed on the letter right away. This scenario indicates someone else filed a return using your client’s SSN or ITIN, which is a potential identity theft situation. The IRS Taxpayer Protection Program is the correct escalation path, not the general IRS phone line.

Does Letter 6483C apply if my client used an ITIN instead of an SSN?

Yes. The letter references whichever taxpayer identification number — SSN or ITIN — was used on the return in question. If the client holds an ITIN, make sure it’s current; ITINs can expire and require renewal via Form W-7. An expired ITIN may create additional complications alongside the identity verification process, so resolve both issues in parallel rather than sequentially.