What does my IRS notice number mean?

The notice or letter number — printed in the top-right corner, like CP2000 or LTR 5071C — identifies exactly what the IRS is telling you. A CP2000 proposes changes because reported income didn't match third-party records; a 5071C asks you to verify your identity. Search the specific number in the IRS "Understanding Your Notice or Letter" tool to see what's being asked and by when.

How do I know if an IRS notice is legit?

The IRS initiates contact by mail, not by unsolicited email, text, or phone call demanding immediate payment. A genuine notice has a notice number, your partial tax details, and official response instructions, and it never demands payment by gift card or wire transfer. If unsure, verify the notice number on IRS.gov or in your IRS Online Account — never use contact info from a suspicious message.

Can I view IRS notices online?

Yes, for many notices. Logging into your IRS Online Account lets you view digital copies of select notices, check your account balance, and review your correspondence history. Not every notice is available there, so the mailed copy remains the authoritative record — keep it filed with the tax year it concerns.

Is an IRS notice always bad news?

No. Many notices are routine: a math correction, a refund adjustment, a request to verify identity, or confirmation a payment was received. Some do require action or payment by a deadline. The key is to read the notice number, understand the issue, and respond on time rather than ignoring it — ignoring a notice can lead to penalties, interest, or collection activity.

How long should I keep IRS notices?

Keep each notice with the tax return it concerns, for as long as you keep that return. The IRS suggests at least 3 years for most returns, 6 years if you under-reported income by over 25%, and indefinitely if you never filed or filed fraudulently. A notice documents an adjustment, dispute, or payment, so your records are the evidence if the issue recurs.

Tax

IRS Notice or Letter

An IRS notice or letter is official correspondence from the IRS about your tax account — a balance due, a refund change, a return adjustment, an identity-verification request, or an audit. Each carries a notice or letter number (like CP2000 or LTR 5071C) in the top-right corner that identifies exactly what it's about.

Written & maintained by the Granite team · Last updated June 2026

Overview

The IRS sends notices by mail for dozens of reasons, from a simple math correction to a proposed assessment. The notice number — printed in the upper-right corner — is the key to understanding it; it tells you the issue, what (if anything) you owe, and the deadline to respond.

Many notices carry strict response windows, and ignoring one can turn a small correction into liens or levies. The IRS never initiates contact by email, text, or phone demanding payment — a mailed notice is the legitimate channel.

When you’ll get your IRS Notice or Letter

The IRS adjusted your return or refund
You have a balance due or a payment was missed (e.g. a CP14 or CP501/CP503)
The IRS needs to verify your identity before processing a return (e.g. a 5071C or 4883C)
Your return was selected for review or audit
A form the IRS received doesn't match what you reported (e.g. a CP2000)

What’s on your IRS Notice or Letter

These are the fields Granite reads and extracts automatically the moment you upload one.

Notice / Letter Number: The code in the top-right (e.g. CP2000, LTR 5071C) that identifies the issue.
Tax Year: The year the notice concerns.
Amount Due or Adjusted: Any balance, refund change, or proposed assessment.
Response Deadline: The date by which you must reply or pay to avoid escalation.
Issue Description: What the IRS is telling you or asking for.
Contact / Response Instructions: How and where to respond or dispute.

How long to keep it

Keep each IRS notice with the tax return it relates to, for as long as you keep that return. The IRS suggests at least 3 years — but 6 years if you under-reported income by more than 25%, and indefinitely if you never filed or filed a fraudulent return.

The IRS keys recordkeeping to the period of limitations for the return in question, so a notice should live as long as the return it concerns. A notice is the paper trail of an adjustment, dispute, or payment — keeping it, plus proof of how you responded, is your evidence if the same issue resurfaces or a later notice contradicts an earlier resolution.

How Granite handles your IRS Notice or Letter

Granite reads an IRS notice and pulls the notice number, tax year, amount, and response deadline, then files it with that year's tax documents. It can surface the deadline so a time-sensitive letter doesn't get buried, and it keeps every notice and your response together — so if the issue comes back, the full history is one search away.

FAQ

IRS Notice or Letter: common questions

What does my IRS notice number mean?: The notice or letter number — printed in the top-right corner, like CP2000 or LTR 5071C — identifies exactly what the IRS is telling you. A CP2000 proposes changes because reported income didn't match third-party records; a 5071C asks you to verify your identity. Search the specific number in the IRS "Understanding Your Notice or Letter" tool to see what's being asked and by when.
How do I know if an IRS notice is legit?: The IRS initiates contact by mail, not by unsolicited email, text, or phone call demanding immediate payment. A genuine notice has a notice number, your partial tax details, and official response instructions, and it never demands payment by gift card or wire transfer. If unsure, verify the notice number on IRS.gov or in your IRS Online Account — never use contact info from a suspicious message.
Can I view IRS notices online?: Yes, for many notices. Logging into your IRS Online Account lets you view digital copies of select notices, check your account balance, and review your correspondence history. Not every notice is available there, so the mailed copy remains the authoritative record — keep it filed with the tax year it concerns.
Is an IRS notice always bad news?: No. Many notices are routine: a math correction, a refund adjustment, a request to verify identity, or confirmation a payment was received. Some do require action or payment by a deadline. The key is to read the notice number, understand the issue, and respond on time rather than ignoring it — ignoring a notice can lead to penalties, interest, or collection activity.
How long should I keep IRS notices?: Keep each notice with the tax return it concerns, for as long as you keep that return. The IRS suggests at least 3 years for most returns, 6 years if you under-reported income by over 25%, and indefinitely if you never filed or filed fraudulently. A notice documents an adjustment, dispute, or payment, so your records are the evidence if the issue recurs.

Sources

This page is checked against primary and authoritative sources:

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