Why Would the IRS Send Me a Letter? 10 Common Reasons
The IRS may send you a letter because you owe taxes, your refund has changed, your return contains an error, your identity needs verification, or the agency needs more information. Other reasons include mismatched income records, tax credit reviews, processing delays or an audit. Receiving an IRS letter does not automatically mean you are in trouble. Read the notice, find its CP or letter number, check any response deadline and verify it through IRS.gov before sending money or personal information.
Opening your mailbox and finding an envelope from the Internal Revenue Service can be unsettling, especially when you were not expecting any communication.
But an IRS letter does not necessarily mean you owe money, made a mistake or are being investigated.
Some notices simply explain a change to your refund or confirm an update to your tax account. Others require you to provide documents, verify your identity or respond to a proposed tax adjustment.
The most important thing is to identify which notice you received and follow its specific instructions.
10 Common Reasons the IRS Sends Letters
1. You Owe Additional Federal Income Tax
The IRS may send a notice if its records show an unpaid tax balance.
This can happen when:
- You filed a return showing tax due but did not pay the full amount.
- A payment was not credited as expected.
- The IRS adjusted your return and calculated additional tax.
- Interest or penalties were added to an outstanding balance.
A balance-due notice typically explains the amount owed and payment options.
What to do: Compare the notice with your tax records and check your balance through your official IRS Online Account before making a payment.
2. Your Tax Refund Amount Has Changed
Sometimes the IRS sends a letter because your refund is larger or smaller than the amount shown on your return.
Possible reasons include a correction to reported information, an adjustment to a credit or another account change.
What to do: Compare the notice with your original tax return and review the explanation for the adjustment.
If you disagree, follow the dispute instructions and deadline printed on the notice.
3. The IRS Corrected a Mistake on Your Tax Return
The IRS may identify an arithmetic error or another issue during processing.
For example, a correction could affect the total tax, refund or credit amount.
Not every correction increases the amount you owe. Some corrections may benefit the taxpayer.
What to do: Read the explanation and compare the corrected figures with your filed return.
4. The IRS Needs to Verify Your Identity
The IRS may request identity verification when a tax return is filed using your Social Security number or individual taxpayer identification number and the agency needs to confirm that the return is legitimate.
Identity verification notices can include the CP5071 series and certain other letters.
If you receive an identity verification letter but did not file the tax return mentioned, do not ignore it. Someone may have attempted to file a return using your information.
What to do: Go directly to IRS.gov’s Verify Your Return service and follow the instructions for your specific notice.
5. Your Tax Refund or Return Is Delayed
The IRS may contact you if additional review or information is needed before processing can continue.
A processing delay does not automatically mean the return was rejected or that an audit has begun.
What to do: Follow any requests in the letter and check your refund status using the official Where’s My Refund? tool.
6. Your Income Does Not Match IRS Records
The IRS receives income and payment information from employers, banks and other organizations.
If those records do not match your tax return, the agency may send a notice proposing an adjustment.
For example, an employer’s Form W-2 or a bank’s Form 1099 may report an amount that differs from what you entered.
One common example is the CP2000 notice.
A CP2000 is a proposed adjustment based on an information mismatch. The IRS states that it is not itself a bill. You should review the proposed changes and respond as instructed.
What to do: Compare the IRS figures with your W-2s, 1099s and tax return. If you disagree, send the requested explanation and supporting documents by the stated deadline.
7. The IRS Needs Additional Documents
Some tax returns require supporting information before the IRS can complete its review.
The notice might request documents related to income, withholding, dependents, credits or another issue.
What to do: Send only the documents requested, using the submission method specified in the notice.
Keep copies of everything you provide.
8. Your Return Has Been Selected for Examination
An IRS audit or examination notice may ask you to verify specific items reported on a return.
Being selected for an examination does not automatically establish that you owe additional taxes.
What to do: Read the scope of the examination, gather the relevant records and follow the notice’s instructions.
Consider consulting a qualified tax professional if the issues are complex or the amounts are significant.
9. The IRS Is Reviewing a Tax Credit or Deduction
Some notices concern the eligibility or documentation for a tax credit or deduction.
For example, the IRS may ask for information supporting an item claimed on a return.
What to do: Identify the exact credit or deduction mentioned and provide the requested documentation before the deadline.
10. Your Tax Account Has Been Updated
Not every IRS letter requests payment or documents.
Some notices inform you that an adjustment has been made, a payment was applied or an account issue was resolved.
What to do: Read the notice and save it with your tax records. If no response is requested and the information is correct, you may not need to take further action.
IRS Notice Numbers: What Does Your Letter Mean?
IRS correspondence commonly includes a notice number beginning with CP or a letter number.
The number helps identify the issue and the relevant instructions.
| Notice or Letter | General Meaning | What to Check |
|---|---|---|
| CP14 | Initial notice of an unpaid tax balance. | Amount due, payments credited and deadline. |
| CP2000 | Income or payment information does not match the filed return. | Proposed adjustment and response deadline. |
| CP12 | IRS corrected one or more errors affecting a refund. | Correction details and refund amount. |
| CP05 | Return is under review and refund may be delayed. | Whether the notice requests any action. |
| CP5071 series / Letter 5071C | Identity and tax-return verification may be required. | Official verification instructions. |
| CP75 | IRS is examining certain claimed credits or tax items. | Required supporting documents. |
| Letter 4800C | Proposed changes to a tax return. | Proposed adjustments and response date. |
Notice descriptions are general summaries. The actual document controls what you must do.
Find your notice through the official IRS notice and letter guide.
How to Tell if an IRS Letter Is Real
Scammers sometimes imitate tax notices to frighten people into sending money or revealing personal information.
Use the following checks before responding.
| What to Check | Safer Action |
|---|---|
| Notice or letter number | Look it up directly on IRS.gov. |
| Payment request | Confirm any balance through your IRS Online Account. |
| Unexpected QR code or link | Navigate to IRS.gov yourself instead of relying on the link. |
| Threats of immediate arrest | Treat demands involving threats or unusual payment methods as major warning signs. |
| Gift card or cryptocurrency demand | Do not send payment; verify through official IRS channels. |
| Personal information request | Use only verified IRS services and instructions. |
Do not send money or disclose your Social Security number merely because a letter uses an IRS logo. Logos, addresses and notice formats can be copied.
If you are uncertain, independently open IRS.gov or use a verified IRS contact channel.
What Should You Do After Receiving an IRS Letter?
Identify the tax year, issue, proposed change and any action requested.
Look for a CP number or letter identifier, usually near the top or bottom of the correspondence.
Visit IRS.gov directly and look up the notice. If it involves an account balance, review your IRS Online Account.
Some letters are informational. Others require a response within a specified period. Do not assume every notice has the same deadline.
Review the relevant return, payment confirmations, W-2s, 1099s and other documents.
If the notice requires action, use the stated method. If you disagree with a proposed adjustment, provide the explanation and supporting evidence requested.
Keep the original letter, your response, supporting documents and delivery confirmation with your tax records.
Do You Have to Respond to Every IRS Letter?
No. Some IRS letters are informational and require no response if the information is correct.
You generally need to act when the letter:
- Requests additional documents.
- Requires identity verification.
- Asks you to agree or disagree with proposed changes.
- Identifies a payment issue that needs attention.
- Provides a deadline for protecting your rights.
Always follow the instructions in your particular notice rather than relying on a general rule.
What Happens if You Ignore an IRS Letter?
The consequences depend on the type of notice.
Ignoring an informational letter may have little immediate effect. But ignoring a notice requiring action can lead to:
- Further IRS correspondence.
- Delays in processing a return or refund.
- Assessment of proposed tax changes.
- Additional interest or penalties.
- Loss of opportunities to dispute a proposed adjustment.
- Collection action when legally applicable.
Some notices carry legally significant deadlines. If a letter mentions appeal rights, a notice of deficiency, levy or lien, seek prompt assistance if you do not understand it.
Why Did the IRS Send Me a Letter After I Already Got My Refund?
Receiving a refund does not necessarily mean every item on your tax return has completed all possible review or information-matching processes.
The IRS may later identify a discrepancy, process additional information or make an adjustment.
Read the notice to determine whether it relates to the same tax year as your refund.
Do not automatically repay money simply because a letter claims your refund was incorrect. Verify the notice and its calculations first.
Why Would the IRS Send a Letter in October?
IRS correspondence is not limited to the main tax-filing season.
Letters may be sent throughout the year concerning balances, return processing, information matching, account changes or examination matters.
An October letter does not, by itself, identify a particular problem.
The notice number and tax year are more useful than the month in which it arrived.
Can You View IRS Letters Online?
Some IRS notices are available electronically through an individual IRS Online Account.
However, not every mailed letter or notice is necessarily available online.
To check:
- Visit IRS Online Account.
- Sign in using the official authentication process.
- Review the available notices, messages and account information.
- Compare any digital notice with the mailed document.
If you cannot find the mailed letter online, that alone does not prove it is fraudulent.
What if the IRS Says You Owe Money but You Cannot Pay?
First, confirm that the amount is correct.
If the tax is legitimately owed but you cannot pay in full, the IRS offers payment arrangements and other options for qualifying taxpayers.
Possible options may include an installment agreement or assistance based on financial circumstances.
Visit the official IRS payment options page rather than sending money through an unsolicited payment link.
What if You Disagree With an IRS Notice?
You do not have to agree with every proposed IRS adjustment.
If you believe the notice contains an error:
- Read the explanation carefully.
- Compare the proposed adjustment with your filed return.
- Gather supporting documents.
- Follow the dispute instructions in the notice.
- Respond before the deadline.
- Keep proof of your response.
If the issue is complicated, consider speaking with a qualified tax professional or the Taxpayer Advocate Service.
Frequently Asked Questions
Why would the IRS send me a letter out of nowhere?
The IRS may need to notify you of a tax account change, request documents, verify your identity, explain a refund adjustment or contact you about an unpaid balance.
Does getting an IRS letter mean I’m being audited?
No. Many IRS letters concern routine processing or account matters. An audit notice will identify an examination or request related to the review.
Why did the IRS send me a letter if I don’t owe taxes?
The letter may concern a refund, identity verification, processing delay, corrected return or informational account update.
Can the IRS send a letter about a previous tax year?
Yes. Some notices concern prior-year returns, payments or information-matching discrepancies.
How do I know what an IRS CP notice means?
Find the CP number on the document and look it up through the IRS notice and letter directory.
Is a CP2000 notice an audit?
A CP2000 is generally a proposed adjustment arising from differences between information reported by third parties and information on your return. It is not itself a bill.
What if I receive an IRS identity verification letter?
Use the official IRS identity verification service for the notice you received. If you did not file the return mentioned, follow the IRS instructions for reporting that fact.
Can I ignore an IRS letter if I already paid my taxes?
No. Read it first. The letter could concern a payment that was not properly credited or another issue requiring attention.
Should I call the IRS immediately after getting a letter?
Not necessarily. Many notices can be handled by following the written instructions. Call if clarification is needed or the notice directs you to do so.
Can an IRS letter be fake?
Yes. Verify unexpected correspondence independently through IRS.gov, especially before paying money or providing sensitive information.
Bottom Line
If you are wondering “Why would the IRS send me a letter?”, remember that IRS correspondence can have many explanations, and not all of them are negative.
Find the notice number, read the reason for contact, verify the document and check whether a response is required.
Never ignore a deadline, and never send money or sensitive information until you have confirmed the request is legitimate.
Related BillUnpacked Guides
- Social Security 2027 COLA Estimates
- How Long Do Pending Transactions Take to Clear?
- How to Cancel a Pending Transaction
- How to Withdraw From a 401(k) in 2026
Official IRS Sources
IRS — Understanding Your Notice or Letter
IRS — What to Do When You Receive IRS Mail
IRS — Understanding a CP2000 Notice
IRS — Verify Your Identity and Tax Return
Last reviewed: October 9, 2026. This article provides general U.S. tax information, not personalized tax or legal advice. The specific IRS notice and applicable deadlines control your next steps. BillUnpacked is an independent informational website and is not affiliated with the Internal Revenue Service.