The IRS sends letters for many different reasons, and getting one does not automatically mean you did something wrong or are being criminally investigated.

Common reasons the IRS sends a letter

  • You have a balance due or unpaid taxes (for example, you underpaid during the year or the IRS found additional tax owed after reviewing your return).
  • Your return was changed or corrected (math error, missing form, mismatch with employer or bank reporting, etc.), resulting in a different refund or amount due.
  • Your refund is delayed, reduced, or offset (for example, applied to past‑due tax, child support, or federal debts), and they are explaining the adjustment.
  • They need more information or documentation to finish processing your return (support for deductions/credits, clarification of filing status, identity details, etc.).
  • They want to verify your identity because of possible identity theft or suspicious activity before releasing a refund or processing a return.
  • You were selected for an audit or examination and they are asking for records or notifying you of an in‑person/ correspondence audit.
  • Collection actions are being started or escalated (notices of intent to levy, federal tax lien filing, or final warnings with strict deadlines).
  • They are confirming a request or change, such as a payment plan, change of address, or other account adjustment.

What to do if you get an IRS letter

  • Open it right away and read it slowly from top to bottom; most IRS notices clearly state why they’re writing and what (if anything) you must do.
  • Check the notice or letter number (CP or Letter number) and compare the IRS changes to a copy of your original return to see what changed and whether you agree.
  • If you agree, follow the instructions (pay by the deadline, send documents, or simply keep the letter if it is “for your information only”).
  • If you disagree, respond in writing or by calling the number on the notice before the deadline; responding on time helps protect your appeal rights and can reduce penalties and interest.
  • Watch for certified mail in particular; certified IRS letters often relate to audits, appeals, or enforced collection and usually carry strict response deadlines.

How to tell if the letter is real

  • The IRS primarily contacts taxpayers by U.S. mail; unsolicited emails, texts, or social media messages claiming to be from the IRS are almost always scams.
  • Real notices include your name, part of your address, the last four digits of your SSN or EIN, a notice/letter number, and IRS contact information; if something looks off, independently look up the official IRS phone number instead of using a suspicious contact line.

Simple mini “Quick Scoop” recap

  • The most common answers to “why would the IRS send me a letter” are: unpaid tax, changes to your return, identity verification, audit, collection action, or processing delays.
  • The safest move is always: open it, understand it, compare it to your return, and respond or pay by the stated deadline if required.

Information gathered from public forums or data available on the internet and portrayed here.