IRS CP2000: What a proposed adjustment means and how to respond

The IRS's Automated Underreporter program compares your return with information returns — W-2s, 1099-NEC, 1099-K, 1099-B, 1099-INT, 1098 and others. When something doesn't match, it sends a CP2000 showing each item, the proposed change to your tax, and any penalty and interest. Common causes are a forgotten 1099, stock sales reported without cost basis, cancelled debt, retirement distributions, or gig and payment-app income.

The key point: a CP2000 is a proposal, not an assessment. Nothing has been added to your account yet, and you have the right to respond before it is. That makes it different from collection notices like CP14 or CP504.

Use the response date printed on the notice — typically about 30 days from the notice date (longer if you live outside the U.S.). If you need more time to gather records, call the number on the notice (after verifying it on IRS.gov) and ask for an extension before the date passes.

If you don't respond, the IRS usually issues a statutory notice of deficiency (CP3219A), which gives you 90 days to petition the U.S. Tax Court. After that, the tax is assessed and normal collection notices begin.

Check that the information returns listed match what you actually received. You can see the forms the IRS has on file by requesting a wage and income transcript through your IRS Online Account — see how to get IRS transcripts. A genuine CP2000 lists the payer names and amounts and includes a response form. Don't call numbers printed only on a suspicious letter, and remember the IRS doesn't demand immediate payment by gift card or wire.

If you disagree with all or part of the proposal, check the box on the response form and attach an explanation with documents. Typical disputes:

• Cost basis — a broker reported sale proceeds but not what you paid. Send Form 8949 detail or broker statements showing basis.
• Income already reported — the amount was on your return in a different place (e.g., business income on Schedule C). Show where.
• Income that isn't yours — a 1099 issued in error or identity theft. Include the payer's corrected form or an identity theft affidavit (Form 14039).
• Non-taxable items — rollovers, gifts, reimbursements or personal sales at a loss on a 1099-K.

The IRS can accept your explanation, send a revised notice, or issue a notice of deficiency if it still disagrees.

Sign the response form agreeing to the change and return it by the deadline. You can pay the amount then, or wait for the bill and set up a payment plan. If the proposed amount includes an accuracy-related penalty, you can still ask for it to be removed if you had reasonable cause — see reasonable cause penalty relief. Interest generally can't be removed.

Once agreed and assessed, the balance becomes regular tax debt and can move through the collection notices if unpaid.

• Owe $50,000 or less after the change: an online Simple Payment Plan is usually available.
• Pay within 180 days: use a short-term plan with no setup fee.
• Can't pay: after assessment, Currently Not Collectible status or an Offer in Compromise may apply depending on income and assets.
• Gig, crypto or 1099 income: see gig worker tax debt and crypto tax debt for common issues.

The calculator on this page shows which options fit your situation.

A CP2000 is part of the IRS's document-matching process, not the collection sequence. The usual order is: CP2000 (proposal) → your response → either a closing letter, a revised CP2000, or a statutory notice of deficiency (CP3219A) → assessment → a balance-due bill such as CP14. Only after assessment do collection notices like CP504 and final levy notices like LT11 become possible.

Because the CP2000 comes before any assessment, it's the cheapest point to fix a mistake. Responding with documents now avoids interest building on a balance you may not owe, and it keeps your Tax Court rights intact. Keep copies of everything you send and note the date you mailed or faxed it. If you've received several years of CP2000s for the same kind of income, consider whether your current-year withholding or estimated payments need to change so the problem doesn't repeat.