Chapter 9: IRS Letters and Audits — Don’t Fear the Envelope

This post is Chapter 9 of 14 of the book Keep More of What You Earn — a plain-English guide to US taxes.

The envelope is unmistakable: government seal, “Department of the Treasury — Internal Revenue Service,” your full name in the window. Karen’s hands shake opening it. Inside: “CP2000 — Notice of Underreported Income.” The IRS says she forgot $3,200 in freelance income. Proposed additional tax: $704, plus $141 in penalties and interest. Her mind races: Am I in trouble? Is this an audit? Do I need a lawyer?

Breathe. Karen’s letter is the most common IRS notice in America, it’s not an audit, and it’s resolvable by mail in an afternoon.

First, the rule that filters 90% of tax fraud aimed at you: the IRS initiates contact by mail. Always. Not by phone. Not by text. Not by email. If “the IRS” calls threatening arrest unless you pay in gift cards — that’s a scam, full stop. When in doubt, hang up and call the IRS yourself at 800-829-1040.

The notice decoder: what the common letters mean

CP12 — “We corrected your return.” Math error. Check their math; if right, pay the difference or accept the adjusted refund. No response needed if you agree.

CP2000 — “We show income you didn’t report.” Karen’s letter. The IRS matched your return against the W-2s and 1099s it received and found a gap. This is a proposal, not a bill: you have 30–60 days to agree, partially agree, or disagree with documentation. The #1 notice in America and the #1 most avoidable.

CP3219A — Notice of Deficiency. The escalation: you didn’t respond, so the IRS is formally proposing the additional tax. You have 90 days to petition the Tax Court — miss that window and the assessment becomes final. Never ignore it.

Letter 566 / audit notifications. An actual examination — most are correspondence audits: conducted entirely by mail, focused on one or two items. Office audits happen at an IRS office. Field audits — an agent visiting — are for businesses and wealthy individuals. For ordinary filers, “audit” means “send us receipts by mail.”

CP49 — “We applied your refund to a debt.” Your refund was offset against back taxes, defaulted student loans, or child support. Informational — but verify the underlying debt was really yours.

LT11 / Letter 1058 — “Intent to levy.” The serious one: the IRS intends to seize assets or garnish wages, usually 30 days out. If you get one, act within days — call the IRS or a tax professional immediately.

How audits actually work (and how likely one is)

Audit rates for ordinary filers hover around half of one percent — roughly 1 in 200 returns. A straightforward W-2 return with the standard deduction is very unlikely to be examined.

Returns are selected by computer scoring (DIF), by mismatch (the CP2000 pipeline), and by random sampling. Items that raise your score: round numbers on business expenses, large charitable deductions relative to income, big business losses year after year, cash-heavy businesses with thin records.

The statute of limitations:

• 3 years from filing: the standard window.
• 6 years: if you underreported income by more than 25%.
• Unlimited: if you never filed, or filed fraudulently. File every year, even if you can’t pay — filing starts the 3-year clock.

The response playbook: the first 48 hours

1. Don’t ignore it. Don’t panic. Read it twice. Every notice states what the IRS thinks, what it wants, and your deadline.

2. Check whether they’re right. Pull your copy of the return and the underlying documents. About a third of the time, the IRS is wrong or incomplete: a corrected 1099 they didn’t process, a rollover coded as a distribution.

3. Calendar the deadline and respond in writing — certified mail with return receipt. Phone calls are fine for questions, but your position should be on paper.

4. Send exactly what’s asked — no more. Answer the question asked, provide the documents requested, volunteer nothing else.

5. If you agree, pay (or arrange to pay). Agreeing stops penalties from growing.

6. If you disagree, say so with evidence. Clear, specific, documented disagreements resolve quickly.

Appeals and your rights

The IRS has an independent Office of Appeals — most disputes settle there without court. If appeals fails, you can petition the U.S. Tax Court — and you generally don’t pay first and sue later. Know the Taxpayer Bill of Rights, and two free resources: the Taxpayer Advocate Service and Low Income Taxpayer Clinics (free/low-cost representation in disputes).

When to call for backup

Handle it yourself: CP12 math corrections, CP2000s where the IRS is clearly right or wrong with simple proof, straightforward correspondence audits with good records. Call a professional (EA, CPA, or tax attorney): field or office audits, any notice mentioning fraud, levies and liens, multi-year examinations, offers in compromise. Form 2848 (power of attorney) lets your representative deal with the IRS directly.

One hard rule: never lie to the IRS, and never create documents. The civil penalties for being wrong are money; the penalties for lying can be prison. An honest mess is fixable. A fabricated record is not.

First-time penalty abatement: ask and you may receive

First-Time Abatement (FTA) waives failure-to-file, failure-to-pay, and failure-to-deposit penalties if you: have a clean compliance history for the prior three years, are current on all filings, and have paid (or arranged to pay) the underlying tax. Call the IRS number on your notice and say the words “first-time abatement” — or write requesting it. It doesn’t cover interest, but for routine late penalties it’s the closest thing to a magic wand in the tax code.

The 2026 scam gallery

• The threatening call: “Pay now by gift card or police will arrest you.” The IRS never demands immediate payment by phone and never takes gift cards. Hang up.
• The fake notice email/text: The IRS doesn’t send notices by email or text. Forward phishing to phishing@irs.gov.
• Social media “tax experts”: if tax advice comes with a dance trend, verify it at IRS.gov.

The defense is always the same: the IRS writes letters on paper, gives you deadlines in weeks (not minutes), and never wants gift cards.

Key takeaways

1. The IRS initiates contact by mail — always. Calls, texts, and emails demanding payment are scams.
2. Notices aren’t audits. CP12, CP2000 (a proposal), CP3219A (90 days to Tax Court — never ignore), and audit letters each demand a different response.
3. Audit odds for ordinary filers are ~1 in 200, mostly by mail. Statute of limitations: 3 years (6 if >25% underreported; unlimited for fraud or non-filing).
4. The response playbook: read twice, verify, calendar the deadline, respond in writing (certified mail), send exactly what’s asked.
5. You can appeal — Appeals settles most disputes; Tax Court doesn’t require paying first.
6. Never lie, never fabricate. Get professional backup for field audits, levies, or fraud allegations.

Next: Chapter 10 — Retirement Accounts.