CSED Tolling — Events That Extend the IRS Collection Window — Definition Glossary

Defined by Sarah Mitchell, CPA | Reviewed by: James Okafor, EA | Updated May 2026

Full Definition

The Collection Statute Expiration Date (CSED) is normally 10 years from assessment, but certain events “toll” (pause) the statute, effectively extending the IRS’s collection window beyond the base 10-year period. Key tolling events: (1) Pending OIC: the CSED is tolled for the entire period an OIC is under review, plus 30 days after final rejection — a 24-month OIC review extends the CSED by 2 years plus 30 days; (2) Bankruptcy: the CSED is tolled for the entire bankruptcy period plus 6 months; (3) CDP Hearing: tolled during the CDP proceeding; (4) Innocent spouse claim: tolled during the review period; (5) Collection waiver agreement: when the taxpayer agrees to extend the CSED (Form 900); (6) Military service in a combat zone; (7) Living outside the US for 6+ months. For businesses and business owners with long-running 941 tax debt, multiple OIC attempts, or bankruptcy history, the actual CSED can be substantially later than the nominal 10-year date — sometimes by 5-10 additional years.

Why This Matters for Businesses With Tax Debt

Understanding CSED Tolling — Events That Extend the IRS Collection Window is essential for any business owner navigating IRS enforcement or business tax debt. This term directly affects the resolution options available — including whether tax debt financing is a viable solution, how federal tax liens affect the business, and what the IRS can legally collect.

Related Tax Terms

• Collections Statute Expiration Date
• Offer in Compromise
• Bankruptcy and Business Tax Debt

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Sources: IRS.gov; Internal Revenue Code (IRC); IRS Publications 1, 594, 1660, 594. Tax Funds is a financing marketplace — not a lender, CPA firm, or law firm. Content is for informational purposes only and does not constitute tax or legal advice.