CP2566: Proposed tax calculation for a missing return
Prepared by TaxRZR editorial team · IRS sources checked 2026-10-29 (ET) · professional review pending · This page’s Source Notes
CP2566 says the IRS did not receive your tax return and calculated proposed tax, penalties and interest using wages and other income reported by employers, financial institutions and others. The calculation may omit expenses or deductions you are entitled to claim. Filing an accurate return may reduce the proposed amount; it does not guarantee a reduction. This is a missing-return proposal, not the CP2000 mismatch process for a filed return.
What the IRS can do next
If you do not resolve the missing return, the IRS may proceed with substitute-for-return and assessment procedures, including a statutory notice of deficiency such as CP3219N. An unpaid assessed balance can eventually lead to collection, subject to applicable notice and appeal requirements. CP2566 is not itself a statutory notice of deficiency or a final levy notice offering Collection Due Process (CDP) hearing rights. Do not assume another warning is guaranteed or that unrelated collection is paused.
Respond by the date shown on your CP2566. No universal response day count is supplied by the IRS CP2566 page; use your printed deadline.
The CP2566 FAQ says no action is needed if you filed within the last eight weeks. This is recent-filing guidance, not an eight-week response deadline or an extension of a printed date. Keep proof of filing and call the IRS number on your notice if its instructions differ or the deadline needs clarification. If you did not file or more than eight weeks have passed, follow the filing and Response Form instructions below. CP2566 does not itself open the 90-/150-day Tax Court petition period associated with a statutory notice of deficiency. If you separately receive CP3219N, preserve its own petition deadline: filing a return or calling the IRS does not extend that deadline.
Compare the proposed computation with your income and filing records. By the printed response date, file an accurate return or complete and return the response form to accept the proposed amount and arrange payment. Call the notice number if you disagree or believe you do not have to file.
Steps to work through
- 01Match the name, Social Security number or taxpayer identification number, and tax year on CP2566 to your records. Compare the income information with your W-2s, 1099s, other income and records supporting expenses, deductions and credits. Keep any prior e-file acceptance or mailing evidence; an attempted filing is not proof of acceptance.
- 02If you choose to file your return, the CP2566 page says a return for a tax period from the past two years may be filed electronically through an e-file provider. Otherwise, complete the Response Form at the end of your notice and mail it with a signed, dated return copy in the provided return envelope. Check that the name, taxpayer identification number and tax year match. For a joint return, both spouses must sign and date it. Use your actual notice instructions, not an ordinary filing address.
- 03Include any IRS-issued identity protection PIN (IP PIN) on the return as directed. For a joint return, include each spouse’s IP PIN where applicable. Do not submit these private identifiers to TaxRZR.
- 04If you already filed within the last eight weeks, the IRS CP2566 FAQ says you do not have to do anything; keep filing evidence and clarify any conflicting printed instructions with the IRS. If more than eight weeks have passed, follow the electronic-filing eligibility or mailed signed-return-copy and Response Form instructions, checking the identity and year before submitting.
- 05If you accept the proposed amount, complete and return the response form at the end of CP2566. Pay in full through an official IRS payment channel or explore alternative payment options, including a payment plan if you cannot pay in full. Do not leave a required return unfiled merely because you cannot pay.
- 06If you disagree or think no return is required, call the number on your notice with supporting paperwork ready. Keep copies of the notice, return, response and proof of submission. Track later correspondence and preserve any separate deficiency or collection deadline.
Common misreadings
- Do not treat the proposed computation as a final assessment, a guaranteed correct balance, or a CP3219N statutory notice of deficiency. CP2566R is a distinct code involving a prior CP63 refund hold; do not drop its R suffix or assume CP2566 establishes that history.
- The eight-week recent-filing FAQ is not permission to wait eight weeks before responding to an unfiled-return proposal. The printed response date controls; clarify uncertainty with the issuing IRS office.
- Use the response form enclosed with CP2566. The CP2566 page does not prescribe Form 15103; do not borrow another notice’s form, fax number or processing window.
- The related book chapters and debt inventory offer general records and balance-checking context, not CP2566-specific instructions. E-4 is a cover letter for already assessed substitute returns, not a substitute for responding to this open proposal. Neither a return nor IRS correspondence substitutes for a timely Tax Court petition on a separate deficiency notice.