S-Corp Acceptance Letter (CP261): Everything You Need to Know

CP261 is the written acknowledgment the IRS mails after processing Form 2553. It states that the election was accepted and when it takes effect.

Lenders, payroll providers, and accountants all ask for it eventually. Losing it creates friction even though it changes nothing legally.

The notice also sits inside a family of related letters. Knowing which one you received tells you exactly where you stand.

The notice is short and carries only a few pieces of information. It confirms the corporation's legal name and employer identification number. It states the date S corporation treatment begins. It also confirms the accounting period the IRS has on file.

Check every one of those items on arrival. A wrong effective date creates a mismatch when the first return posts. A name variation can cause returns to reject at filing. Correcting these is far easier immediately than a year later.

Store the notice permanently rather than with the year's tax file. Banks request it when opening accounts or underwriting loans. Payroll providers request it before setting up owner wages. Buyers request it in due diligence years later. Contents of the notice are described there on the agency's own page.

The form instructions indicate a determination within roughly sixty days. Published guidance elsewhere references acknowledgment generally within ninety days. Treat sixty days as the point to start following up. Treat ninety as the point where something has likely gone wrong.

Filing season lengthens both timelines. A Form 2553 submitted in early March competes with peak return volume. The same form submitted in June often processes faster. Nothing about the deadline changes, but expectations should.

Delivery method affects speed as well. Faxed submissions reach a processing queue immediately with a timestamped record. Mailed submissions add transit time on both ends. Either way, silence is not acceptance and should never be read that way.

Several notices travel in this family, and each means something specific. Receiving the wrong one is informative rather than alarming. The table below identifies each and what triggers it. Match yours before deciding what to do next.

A denial notice is not the end of anything. It explains the defect and indicates when you may reapply. Most denials trace to a simple eligibility or signature problem. Fix the defect and refile rather than appealing.

A referral notice means the file went to Chief Counsel for review. Those cases take considerably longer than routine processing. File as a C corporation in the meantime if a return comes due. Amend once the determination arrives.

The IRS does not reissue CP261, which catches people off guard. A substitute verification letter is available instead. The steps below cover both the missing letter and the lost one. Work them in order.

• Wait sixty days from your submission date before initiating contact
• Gather the employer identification number and your proof of filing
• Call the business and specialty tax line at 800-829-4933
• Ask whether the election is on file and what effective date shows
• Request Letter 385C, the verification letter, if the election is recorded
• Request a copy of the filed Form 2553 in the same call if needed
• Refile with a reasonable cause statement if no record exists

The substitute letter typically arrives within about two weeks by mail. It confirms current S status and the election date. It serves every practical purpose the original served. The request process is shared elsewhere in practitioner guidance.

Scan the original the day it arrives. Store the file somewhere that survives an accountant change. That single habit prevents the entire problem.

This is the point almost every article misses. The acknowledgment is an administrative item, not the election itself. Your S corporation status flows from a valid Form 2553, not from the notice. A missing letter does not invalidate anything.

Published guidance confirms this directly. It also confirms that no letter ruling is available for a missing acknowledgment. There is nothing to rule on, because nothing is defective. Request the substitute letter and move forward.

The same guidance addresses a related worry. Filing a return inconsistent with the election, such as a partnership or C corporation return, does not by itself terminate S status. The taxpayer must file consistent returns for open years. That principle is explained by professionals in current commentary.

None of this means paperwork is optional. Inconsistent filings create real complications and invite examination. But an administrative gap is not a fatal defect. Fix the record rather than assuming the election collapsed.

CP261 confirms your S election, its effective date, and your accounting period. Expect it within about sixty days, and start following up at that point. Verify the name, identification number, and date the moment it arrives. Then store it permanently, because no duplicate will ever be issued.

If it never comes or goes missing, call and request the verification letter instead. Remember that the notice acknowledges your election rather than creating it. A valid Form 2553 is what makes you an S corporation. The letter is proof, not the thing itself.