The Collection Statute Expiration Date, or CSED, is the date after which the IRS generally can no longer collect a particular assessed liability by levy or court proceeding. The common shorthand—“the IRS has ten years”—is only the starting point.
The clock usually begins with assessment
Under Internal Revenue Code section 6502, the collection period is generally ten years from the assessment date. It is not necessarily measured from the tax return’s original due date, the date a notice arrives, or the date a taxpayer first learns about the debt.
A single tax year can also contain more than one assessment, each with its own history. For example, an original return assessment and a later audit assessment may not share the same expiration date.
Events can suspend the clock
Federal law can suspend, or toll, the running of the collection period. Events that may affect the calculation include:
- Bankruptcy and the related statutory extension.
- A pending offer in compromise.
- Certain installment-agreement requests, appeals, and terminations.
- A Collection Due Process hearing and related judicial review.
- Extended absence from the United States.
- Litigation or a written agreement extending the period where legally permitted.
Why transcripts need interpretation
Account transcripts show assessment and event codes, but the printed CSED or a quick ten-year calculation should not be accepted blindly. Some events suspend the period for their duration plus an additional statutory period. The effect depends on dates and procedural posture.
The CSED can influence whether an installment agreement, partial-payment agreement, hardship status, or other strategy makes sense. It should be evaluated before a taxpayer signs an agreement that could affect collection rights.