IRS Audit Letter: What to Check Before You Respond
An IRS audit letter can make the situation feel urgent before you know what the IRS is actually questioning. Read the letter before you do anything else. Look for the tax year first then the specific item the IRS is questioning, the records it wants, and the date your response is due.
The scope can be narrower than it first appears. The IRS may be checking just one part of the return, such as Schedule C expenses, reported income, filing status, or a credit. Sending unrelated records can create confusion instead of answering the issue.
Before you respond, pull the filed return for that year and compare the questioned item with what was reported. Then match each IRS request to the documents that support that number or tax position. Understand the scope first, then respond with evidence that addresses it.
Respuesta rápida y puntos clave
Respuesta rápida: An IRS audit letter means the IRS is examining part or all of a tax return and wants you to back up something that was reported. Before you reply, read the letter against the return for that year. Check what the IRS is questioning, what proof it asks for, and the due date. Then gather records that support that specific item.
Puntos clave
- Confirm the letter actually concerns an audit.
- Use the tax year shown on the letter.
- Focus only on the items the IRS identifies.
- Gather records that support those questioned items.
- Follow the response method and deadline shown.
- Correo copies of records, not the originals.
- Keep your complete response and proof of delivery.
What does an IRS audit letter mean?
Getting an IRS audit letter means the IRS wants a closer look at something on a return you filed. The letter should tell you which tax year is involved and what part of the return needs support, whether that’s income, a deduction, a credit, or another item.
It isn’t the same as a final decision that you owe more tax. After reviewing your response, the IRS could leave the return unchanged. It may also ask for more documentation or make changes to the items under examination.
Read the scope carefully. If the letter questions Schedule C expenses, for example, that does not automatically put every line of the return under review. For a broader explanation of the examination process, see our auditoría fiscal del IRS guía.
How do you read an IRS audit letter?
Read it with the return in front of you. Check these five details before gathering records.
- Check the tax year or tax period
Start with the year under examination. Records from another year won’t answer a request tied to this return. - Find the questioned item
Look for the income, deduction, credit, filing status, or other item the IRS names. That points you to the relevant part of the return. - Read the requested records
Focus on what the IRS asks for. If Schedule C expenses are under review, gather records tied to those expenses, not every tax document you have. - Check the response date
Use the date printed on the letter. Don’t assume every audit gives the same response period. - Confirm how and where to respond
The letter may direct you to mail, fax, or upload documents. Follow those instructions. If the figures don’t match the return, an IRS tax transcript may help.
| Find this | Por qué es importante |
|---|---|
| Tax period | Shows which return and records apply |
| Audit issue | Defines what needs support |
| IRS request | Identifies the evidence wanted |
| Fecha de vencimiento | Sets your response timing |
| Reply instructions | Tells you where and how to respond |
Which IRS audit letter did you receive?
The letter number shows where you are in the examination process. Two notices can relate to an audit but require different responses.
Initial contact letters
Letters in the 566 series and Letter 2202B are examples of initial audit correspondence. They usually tell you which return is under examination and point to the records or issues the IRS wants you to address.
Credit-related audit notices
CP75 and CP75A often focus on specific return items, including dependents, filing status, refundable credits, or other claims listed in the notice. Read the document request closely. Proof for a dependent is different from proof for a Schedule C expense.
Later-stage letters
An examination report, Letter 525, or Notice of Deficiency means the case is further along. The question may no longer be simply which records to send. You may need to decide whether you agree with proposed changes and which appeal rights or deadlines now apply.
What records should you gather for an IRS audit response?
Gather records that prove the item under examination, not every tax document you have. Your IRS audit letter should tell you what needs support.
Build an issue-to-proof worksheet
Match each questioned item to the line, schedule, or credit on the filed return, then list the records that support it.
| IRS is questioning | Compare first | Evidence category |
|---|---|---|
| Reported income | Filed return and income records | W-2s, 1099s, sales or deposit records |
| Schedule C expense | Expense on Schedule C | Receipt or invoice plus records showing business purpose |
| Dependent or filing status | Individuals claimed | Relationship or residency records requested by the IRS |
| Refundable or education credit | Credit and related form | Credit-specific records listed in the notice |
El IRS guidance for CP75 shows why this distinction matters. Proof changes depending on whether the IRS is examining a dependent, filing status, credit, or another return item.
A receipt alone may not settle a Schedule C expense question. You may also need records connecting the cost to the business activity. If you respond by mail, send copies rather than original documents, as the Taxpayer Advocate Service recommends.
How should you respond to an IRS audit letter?
Start with the return the IRS is examining. Your response should answer the issues in the notice, not bury them under unrelated paperwork.
- Pull the filed return for that year.
Use the exact version that was filed, including schedules and forms. - Mark every item the IRS questions.
Separate each issue before gathering records. - Compare the IRS figures with your return.
El Servicio de Defensa del Contribuyente recommends checking the proposed figures against what you actually reported. - Gather proof for each item.
For example, a Schedule C expense needs records tied to that business deduction. - Label and organize the documents.
Make it easy to see which record supports which questioned item. - Complete any required reply sheet.
- Use the response method allowed in the letter.
For supported notices, the Herramienta de carga de documentos del IRS can provide confirmation that files were submitted. - Save the full response and proof of delivery.
Before sending, check the tax year, questioned items, document readability, required reply forms, and submission instructions. If the numbers or records don’t line up with the return you filed, stop there. That is a good point to have the response reviewed through Asistencia en auditorías del IRS before you submit it.
What an IRS audit letter does not mean
Receiving one does not automatically mean the IRS has decided your return is wrong. An examination may focus on a single item, and any proposed tax is not final just because the IRS is asking questions.
| It may mean | It does not automatically mean |
|---|---|
| The IRS wants support for an item | The IRS has proved the item is wrong |
| Part of a return is under examination | Every line is being audited |
| You need to respond | You already owe additional tax |
| Records matter | You should send every document you have |
One distinction matters here: a CP2000 is not an audit. It is a proposed adjustment based on information that does not match what was originally reported on your filed tax return.
What happens if you miss the deadline or disagree with the IRS?
Miss the response date on an IRS audit letter and the IRS may finish the examination using the information it has, then send proposed changes. Need more time? Contact the IRS before the date shown.
| Situación | Timing | Acción |
|---|---|---|
| Initial request | Date on the letter | Respond or request more time beforehand |
| More information requested | Date in the new letter | Address that request |
| Letter 525 | Generally 30 days | Request Appeals |
| Notificación de deficiencia | Generally 90 days, or 150 days if outside the U.S. | Petition Tax Court before the deadline |
Letter 525 lets you dispute proposed audit changes through IRS Appeals. A Notificación de deficiencia is different. The IRS cannot extend the 90-day Tax Court petition period.
Si no estás de acuerdo
Compare the IRS figures with the filed return before signing anything. If the IRS is missing records or has the facts wrong, provide support and follow the appeal instructions for that stage.
When should you get professional help with an IRS audit letter?
Professional help is worth considering when the issue stops being a simple document request.
- Multiple tax years are involved. More than one return can make the audit harder to reconcile.
- Schedule C or business records are under review. Expenses, deposits, and bookkeeping records may need to tie back to the return.
- Your records do not match what was filed. That discrepancy should be understood before you respond.
- The IRS has proposed changes or the case is moving to Appeals. At that stage, response strategy matters more.
- You need someone to deal with the IRS for you. Taxpayers have the right to authorized representation. See our declaración de auditoría guide, or start with IRS audit assistance for notice review and response preparation.
Frequently asked questions about IRS audit letters
Does the IRS always send a letter before an audit?
Yes. The IRS says initial contact is made by mail. Later communication may continue through approved channels, depending on whether the examination is handled by correspondence or in person.
How can I tell whether an IRS audit letter is real?
Check the notice or letter number against IRS.gov and read the response instructions carefully. Be suspicious if the first contact arrives by phone, text, email, or social media. A real IRS audit letter should come through the mail with identifying information and reply instructions.
What happens if I get audited and don't have all my receipts?
Do not create or alter records. For a Schedule C expense, other legitimate records may help show payment or business purpose, but whether they are enough depends on the deduction and what the IRS requested.
How many years back can the IRS audit?
The IRS says audits generally involve returns filed within the last three years. It may add earlier years when a substantial error appears, and generally does not go back more than six years.
Can I upload an IRS audit response online?
Sometimes. If your notice or letter is supported, follow its instructions and use the IRS Document Upload Tool. Save the submission confirmation with your response.
Can a CPA represent me during an IRS audit?
Yes. An authorized CPA may represent you before the IRS. Representation is separate from preparing the return, so confirm that audit representation is included before relying on your preparer to act.
Conclusión final
An IRS audit letter becomes much easier to deal with once you reduce it to these five facts:
- Ejercicio fiscal: Which return is under examination.
- Questioned item: What the IRS wants you to support.
- Requested records: Which documents the IRS is asking for.
- Response method: Where and how you should reply.
- Fecha límite: The date your response is due.
Then compare those details with the return you actually filed. If the IRS is questioning Schedule C expenses, for example, your response should tie those expenses back to the return and to records that show what the business paid and why the cost was business-related.
If the return and your records do not agree, do not rush the response. Find the discrepancy first for that year. If you want help reviewing the notice and organizing the support before you reply, see our IRS audit assistance service.
