The IRS sends letters for routine tax matters, not just problems

The IRS mails letters for many reasons — most of them ordinary. You might receive one because you filed a return and they need more information, because they processed your return and want to confirm details, because you're owed a refund, or because they're checking something on your account. A letter does not automatically mean you owe money or are under investigation. The reason is printed on the letter itself, usually near the top or in the first paragraph.

The IRS does not call or email first about tax matters. If you received a phone call or email claiming to be from the IRS, it was not from them. Real IRS correspondence arrives by mail, and the letter will have an IRS address on it.

Key Takeaways

  • IRS letters arrive for routine reasons like processing your return, requesting missing information, or notifying you of a refund.
  • The reason for the letter is stated on the letter itself — read the first page to understand why they contacted you.
  • If you cannot find the reason stated clearly, the notice number (usually at the top right) tells you what type of letter it is.
  • The IRS sends mail only; phone calls and emails claiming to be from the IRS are scams.
  • You have a deadline to respond to most IRS letters, which is printed on the letter — missing it can create problems later.

Common reasons the IRS sends letters

Missing or incomplete information on your return. If you filed a tax return but left out required details — such as a Social Security number, income from a 1099 form, or a dependent's information — the IRS will mail you a letter asking you to send the missing piece. This is routine and does not indicate an error on your part; it simply means the IRS cannot process your return without it.

Verification of income or deductions. The IRS cross-checks returns against documents they receive from employers, banks, and other sources. If something on your return does not match what they have on file, they send a letter asking you to explain or provide proof. For example, if you claimed a large deduction, they might ask for receipts or documentation.

Refund notification. When the IRS processes your return and determines you overpaid taxes, they send a letter explaining the refund amount and when you will receive it. This letter also tells you whether the refund will be mailed as a check or deposited to your bank account.

Changes to your account. If the IRS adjusted your return — either because you made an error or because they found a discrepancy — they send a letter explaining what changed and why. This letter will show the original amount, the adjustment, and the new total.

How to read an IRS letter and find the reason

Every IRS letter has a notice number, usually printed at the top right of the first page. This number identifies the type of letter and what it concerns. The letter will also have a subject line or heading that describes the reason in plain language.

Read the first page carefully. The IRS explains what they need from you, what they found, or what action they took. If the letter asks you to do something — send documents, call a number, or respond by a certain date — that instruction will be in the body of the letter or in a section labeled "What You Need to Do" or similar.

If you are confused about the reason after reading the letter, the notice number is your key. You can search the IRS website for that notice number to find a plain-language explanation of what that type of letter means and what you should do in response.

What to do when you receive an IRS letter

First, do not panic. Most IRS letters are requests for information or notifications of routine actions, not accusations or demands for immediate payment. Read the entire letter before taking any action.

Check the deadline. IRS letters include a date by which you must respond. This date is usually 30 days from the date on the letter, though some letters give you longer. Mark this date on your calendar. If you miss the deadline, the IRS may take action without your input — such as disallowing a deduction or adjusting your refund.

Gather any documents the letter requests. If they ask for receipts, bank statements, proof of income, or other paperwork, collect these before you respond. Keep copies for your records.

Respond in writing if the letter asks you to. Do not call the IRS unless the letter specifically instructs you to. When you write back, include your name, address, Social Security number, and the notice number from the letter. Explain your response clearly and include copies (not originals) of any supporting documents.

Send your response by certified mail with return receipt requested. This creates a record that the IRS received your answer and when they received it. Keep the receipt.

Letters about money you owe versus letters about refunds

If the letter says you owe money, it will state the amount, explain why, and tell you how to pay. You may be able to pay online, by phone, or by mail. The letter will include all these options. If you cannot pay the full amount, the letter may explain payment plans or other options.

If the letter is about a refund, it will tell you the amount and when you will receive it. Refunds are usually issued within 21 days of the IRS processing your return, though this can take longer during busy tax seasons or if the IRS needed to verify information first.

If you disagree with what the letter says — whether it is about money owed or a refund — the letter will explain how to dispute it. This usually involves sending a written explanation with supporting documents within a set time frame.

Scams that pretend to be IRS letters

Scammers sometimes send fake letters that look like they came from the IRS. These letters often threaten immediate action, demand payment by wire transfer or gift card, or ask for personal information like your Social Security number or bank account details.

Real IRS letters never ask for payment by wire transfer, gift card, or prepaid card. Real IRS letters do not threaten to call police or arrest you. Real IRS letters do not ask for your Social Security number, bank account number, or credit card number in the letter itself — they already have this information from your tax return.

If you receive a letter that makes threats, demands immediate payment in an unusual way, or asks for sensitive personal information, it is likely a scam. Do not respond to it. You can report it to the IRS by forwarding it to phishing@irs.gov.

What happens if you do not respond to an IRS letter

If the IRS sends you a letter asking for information and you do not respond by the deadline, they will proceed without your input. This might mean they disallow a deduction you claimed, reduce your refund, or assess additional tax owed. You can still dispute this later, but it is harder and takes longer than responding to the original letter.

If the letter is about money you owe and you do not respond, the IRS may place a lien on your property, garnish your wages, or take other collection action. These actions are serious and can affect your credit and finances for years.

If you genuinely did not receive the letter, or if you received it but cannot understand what it says, contact the IRS using the phone number on the letter. The IRS has customer service representatives who can explain the letter and help you understand what you need to do.

Frequently Asked Questions

Does receiving an IRS letter mean I made a mistake on my taxes?

Not necessarily. Many IRS letters are routine — they might be asking for information you forgot to include, confirming details from your return, or notifying you of a refund. Some letters do indicate the IRS found an error or discrepancy, but the letter itself will explain what they found and give you a chance to respond or provide proof.

What if I cannot find the deadline on my IRS letter?

The deadline is usually printed near the top of the letter or in a box labeled "Due Date" or "Response Date." If you cannot locate it, look for a date that says "Please respond by" or "We need your response by." If the letter still does not show a clear deadline, the notice number will tell you what type of letter it is — you can search that number on the IRS website to find the standard response time for that letter type.

Can I ignore an IRS letter if I think it is a scam?

If you believe the letter is a scam, do not respond to it or click any links in it. Instead, forward it to phishing@irs.gov. If you are unsure whether it is real, call the IRS directly using the phone number on the letter itself — do not use a number from an email or text message. The IRS can confirm whether they sent the letter.

What should I do if I lost my IRS letter?

Contact the IRS using the phone number from your tax return or the IRS website. Have your Social Security number and tax year ready. The IRS can tell you what the letter said, what deadline applies, and what you need to do. They can also send you another copy of the letter if you request it.

How long does it take the IRS to respond after I send them information?

Response time varies depending on what you sent and how busy the IRS is. Simple requests for missing information might be resolved in a few weeks. More complex matters involving verification or adjustments can take several months. The IRS will send you another letter when they have finished reviewing your response.