The IRS CP261 notice is the letter confirming that your corporation’s S-corp election on Form 2553 has been accepted. It shows the date your S-corp status takes effect, and from that date forward your business is taxed as a pass-through: income and losses flow to shareholders instead of being taxed at the corporate level.1Internal Revenue Service. Understanding Your CP261 Notice Keep the notice. It is your proof of S-corp status, and the IRS specifically tells you to file it with your permanent records.
A quick note before anything else: CP261 has nothing to do with a Form 7004 extension request, even though some owners assume it does. It is strictly about your S-corp election.
What the Notice Actually Says
CP261 identifies your corporation by name and EIN and states the effective date of your S-corp status. For a calendar-year corporation that filed Form 2553 on time, that date is usually January 1 of the election year.2Internal Revenue Service. IRS Notice CP261
The notice also flags two duties that catch new S-corp owners off guard. If any shareholder works for the corporation, that shareholder-employee must be paid a reasonable salary before any additional profits are distributed. And every shareholder should track their stock and debt basis, because basis controls how much of a pass-through loss they can actually deduct on their personal return.2Internal Revenue Service. IRS Notice CP261
Check the Effective Date First
Compare the effective date on CP261 to what you requested on Form 2553. If it matches, you are set. If the date is later than you expected, it usually means the IRS treated your election as filed late for the year you wanted, and defaulted it to the next tax year.3Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination
If you believe your Form 2553 was in fact filed on time, the notice instructs you to send the IRS a copy of the form along with proof of timely filing, such as a certified mail receipt or a return-received stamp.2Internal Revenue Service. IRS Notice CP261
Handle the State Side
Federal S-corp status does not automatically apply at the state level. Some states require a separate state S-corp election, and a few do not recognize S-corp status at all, meaning the business could owe state corporate income tax even with no federal corporate tax. Check with your state’s department of revenue to see whether a separate filing is required. Missing this is one of the more expensive mistakes a new S-corp can make.
File the Notice Away and Keep It
Banks, lenders, investors, and the IRS itself may ask for CP261 later. The IRS instructs you to keep it in your permanent records, and reconstructing proof of your election date after the fact is far harder than storing the letter now.1Internal Revenue Service. Understanding Your CP261 Notice
If the Effective Date Is Later Than You Wanted
Form 2553 must be filed either during the tax year before the one you want the election to take effect, or no later than two months and 15 days into the target tax year.4Internal Revenue Service. Instructions for Form 2553 For a calendar-year corporation wanting S-corp status beginning January 1, 2026, the deadline is March 16, 2026, or any time during 2025.
If your CP261 shows a later date because the election was filed late, you may still be able to get it moved back under Revenue Procedure 2013-30. The IRS grants this relief without requiring a private letter ruling, but only if all of the following apply:5Internal Revenue Service. Late Election Relief
- The corporation is otherwise eligible for S-corp status and failed to qualify solely because of the late election.
- You had reasonable cause for missing the deadline.
- The corporation and all shareholders reported their taxes consistent with S-corp treatment for the intended year and every year after.
- Less than three years and 75 days have passed since the intended effective date.
To apply, file a completed Form 2553 with “Filed pursuant to Revenue Procedure 2013-30” written across the top, together with a statement explaining the reason for the delay. All shareholders must sign. Beyond that three-year-and-75-day window, the only remaining option is a private letter ruling, which involves IRS user fees that can run into thousands of dollars.2Internal Revenue Service. IRS Notice CP261
Your New Filing Obligations
Form 1120-S and Schedule K-1
Starting with the effective date on CP261, the corporation must file Form 1120-S each year to report its income, deductions, and credits. The return is due by the 15th day of the third month after the tax year ends. For a calendar-year S-corp, that is March 16, 2026, for the 2025 tax year.6Internal Revenue Service. Instructions for Form 1120-S (2025)
Along with the 1120-S, the corporation prepares a Schedule K-1 for every person who held shares at any point during the tax year. Each K-1 shows that shareholder’s share of income, losses, deductions, and credits. Shareholders must receive their K-1 by the 1120-S filing deadline, and copies go to the IRS attached to the return.6Internal Revenue Service. Instructions for Form 1120-S (2025) Each shareholder then uses the K-1 to report their share of income on a personal return, whether or not any cash was actually distributed to them.
Extensions Through Form 7004
If the corporation needs more time to file, submit Form 7004 by the original due date. That gives an automatic six-month extension, pushing a calendar-year S-corp’s deadline from March 16 to September 15. The extension is automatic when Form 7004 is filed correctly and on time, and the IRS only contacts you if the request is denied.7Internal Revenue Service. Instructions for Form 7004 Common denial reasons include a mismatched EIN or name, filing before the tax year ends, or submitting a duplicate request.
An extension to file is not an extension to pay. Any entity-level tax the corporation owes must still be paid by the original due date.
What Happens If You File Late
The late-filing penalty for Form 1120-S is charged per shareholder. For returns due in 2026, it is $255 per shareholder for each month or partial month the return is late, up to 12 months.6Internal Revenue Service. Instructions for Form 1120-S (2025) A five-shareholder S-corp that files three months late owes $3,825 in penalties before any tax is even in the picture.
If a return with tax due is more than 60 days late, the minimum penalty is the lesser of the tax due or $525. The failure-to-file penalty on any unpaid tax is 5% per month, capped at 25%.8Internal Revenue Service. Failure to File Penalty Interest compounds daily on unpaid balances, including on the penalties.9Internal Revenue Service. Interest
Two paths can reduce or remove these penalties. The IRS’s First-Time Abate program waives failure-to-file and failure-to-pay penalties for taxpayers with a clean compliance record over the previous three years, and you can request it by phone or in writing. Reasonable cause relief is the other option, and it requires showing that circumstances beyond your control (serious illness, natural disaster, records destroyed by fire, incorrect advice from a tax professional) prevented timely filing. Simply not knowing about the deadline is not enough on its own, and a shortage of funds does not qualify as reasonable cause for failure to file.
Keeping the Election Alive
CP261 confirms the corporation met S-corp eligibility on the effective date. Staying eligible matters just as much, because breaking any of these rules can terminate the election on the day the violation occurs.10Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined The corporation must:
- Be a domestic corporation.
- Have no more than 100 shareholders (family members can elect to be counted as one).
- Have only eligible shareholders, generally individuals, certain trusts, or estates. Partnerships, other corporations, and nonresident aliens cannot hold shares.
- Maintain a single class of stock, with all shares carrying identical rights to distributions and liquidation proceeds.
- Not be an ineligible corporation type, such as certain financial institutions, insurance companies, or domestic international sales corporations.
Accidental terminations are the real risk. Issuing a second class of stock, admitting an ineligible shareholder, or crossing the 100-shareholder line all end the election automatically on the day it happens. The corporation reverts to C-corp taxation from that point and generally cannot re-elect S-corp status for five years.3Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination
If a termination truly is inadvertent, the IRS can waive it under IRC 1362(f) when the corporation and shareholders act promptly to fix the problem and agree to any adjustments the IRS requires. Revenue Procedure 2022-19 provides a simplified path for certain inadvertent terminations, letting the corporation correct the issue internally instead of filing a private letter ruling, but only when the corporation catches and fixes the problem before the IRS does.
A yearly review of shareholder agreements, stock issuances, and any ownership changes is the cheapest insurance against losing the status CP261 just confirmed.