Collection Statute Expiration Date: 10-Year Rule, Tolling, and Form 900

The IRS generally has ten years from the date a tax is assessed to collect what you owe, and that deadline is called the Collection Statute Expiration Date, or CSED. Once it passes, the IRS loses the legal authority to levy your accounts, garnish your wages, or sue you for the debt.¹ The catch is that several common taxpayer actions pause the clock, so the actual expiration date is often later than a simple ten-year count from your filing.

How the Ten-Year Clock Works

Under Internal Revenue Code Section 6502, tax may be collected by levy or court proceeding only if the levy is made or the proceeding started within ten years after the assessment.² The assessment date is the day the IRS officially records the liability on its books. That usually happens when you file a return showing a balance due or when the IRS finishes an audit and determines you owe more. If you never file, the IRS can prepare a substitute return and assess tax from that.

Each assessment gets its own ten-year clock. A balance from your 2018 return assessed in April 2019 expires on a completely different date than additional tax assessed after a 2021 audit. The IRS tracks these dates independently, and one expiring does not affect the others. People with several years of tax debt often have CSEDs scattered across a wide range, with the earliest only months away and the latest stretching years into the future.

Finding Your Assessment Date and CSED

Calculating your expiration date starts with the exact assessment date, and the most reliable source is an IRS Account Transcript, which shows a chronological record of everything that happened on a tax year’s account. You can request one online through the IRS Get Transcript tool, by calling 1-800-908-9946, or by mailing Form 4506-T.³

On the transcript, look for Transaction Code 150, which marks the original return filing and initial assessment. The date next to that code is where your ten-year clock started for the base tax. If additional tax was assessed later through an adjustment or examination, you will see Transaction Code 290 or Transaction Code 300, each with its own date and its own separate CSED.⁴ Also watch for codes that signal the clock was paused: Transaction Code 480 indicates a pending offer in compromise, and Transaction Code 520 indicates IRS litigation. If either appears, your actual CSED is later than a straight ten-year calculation would suggest.

Events That Pause the Ten-Year Clock

Federal law identifies specific situations where the clock stops running, called tolling, because the IRS is legally barred from taking collection action during that time. The statute of limitations is suspended for as long as the prohibition lasts.⁵ Interest and penalties keep accruing during these pauses, so tolling both extends the collection window and increases the balance.

Offer in Compromise

When you submit an Offer in Compromise, the IRS cannot levy your property while the offer is under review, and that levy prohibition suspends the collection statute for the entire time the offer is pending. If the IRS rejects the offer, the clock stays paused for another 30 days, and if you appeal within those 30 days, it stays paused through the appeal.⁵ An offer that takes eight months to process, followed by a rejection and no appeal, adds roughly nine months to your CSED. Multiple offers over the years can easily add several years to the collection window.

Installment Agreements

Requesting a payment plan also pauses the clock, and this is one of the most common tolling events. The statute is suspended while a proposed agreement is pending, for 30 days after a rejection, for 30 days after a termination, and during any appeal of a rejection or termination.⁵ Standard installment agreements, where you will pay the full balance within the ten-year window, do not extend the CSED beyond those tolling periods. Partial payment installment agreements, where the plan will not cover the full debt before the CSED, can involve a voluntary extension covered in the next section.

Collection Due Process Hearings

If you receive a notice of intent to levy or a notice of federal tax lien filing, you can request a Collection Due Process hearing using Form 12153. Filing that request suspends the collection statute for the entire time the hearing and any subsequent appeal are pending. The statute also provides a floor: the CSED will not expire before the 90th day after the hearing reaches a final determination, even if more time technically remained on the clock.⁶ Appealing the outcome to Tax Court extends the pause through the litigation.

Bankruptcy

Filing for bankruptcy under any chapter triggers an automatic stay that prevents the IRS from collecting. The collection statute is suspended for the entire period the IRS is prohibited from collecting because of the bankruptcy case, plus an additional six months after the case is discharged or dismissed.⁷ A two-year bankruptcy case pushes the CSED out by roughly two and a half years.

Innocent Spouse Relief Requests

If you file Form 8857 to request relief from tax liability attributed to a spouse or former spouse, the IRS cannot collect on the tax year in question while the request is pending. The CSED is extended by the total time the request was under review, plus an additional 60 days. A request is pending from the date the IRS receives it through final resolution, including any time the Tax Court is considering the claim.¹

Living Outside the United States

If you live outside the country for a continuous period of at least six months, the collection statute is suspended for the entire duration of your absence.⁷ When you return, the clock resumes with whatever time was remaining. There is a floor: if fewer than six months remained at the time of your return, the CSED will not expire until at least six months after you come back.¹

Military Service in a Combat Zone

Members of the Armed Forces serving in a designated combat zone or contingency operation get broad tax deadline relief. The collection statute is suspended for the entire period of service plus 180 days afterward.⁸ If the service member is hospitalized for injuries sustained during service, the hospitalization period is counted, though it does not further extend the collection statute beyond the standard suspension. The same protections apply to the service member’s spouse.

Government Lawsuits

Before the CSED expires, the IRS can ask the Department of Justice to file a lawsuit to reduce the assessment to a court judgment. If a suit is filed in time, the collection period is extended until the resulting judgment or underlying liability is satisfied or becomes unenforceable.² A judgment lien obtained this way lasts 20 years and can be renewed for an additional 20-year period.⁹ The IRS reserves this tool mainly for large liabilities where significant assets exist.

Voluntary Extensions With Form 900

In limited situations, the IRS may ask a taxpayer to voluntarily extend the collection statute using Form 900, the Tax Collection Waiver. This happens almost exclusively with partial payment installment agreements, where scheduled payments will not fully cover the debt before the CSED expires. The IRS can only request a waiver when it sets up the agreement, not during later financial reviews or reinstatements.¹⁰

The extension is capped at five years beyond the original CSED (including any time already added by tolling), plus up to one additional year for administrative purposes. You can refuse to sign. If the IRS requests a waiver and you decline, the agency will typically recommend rejecting your installment agreement request.¹⁰ A waiver is not required when continuing the installment agreement is the only way to satisfy the remaining debt and your financial situation has not significantly changed. All Form 900 extensions require approval from an IRS group manager.

What Happens When the CSED Arrives

Once the collection statute expires on a specific assessment, the IRS must stop all collection activity tied to that debt. Active levies on bank accounts end. Wage garnishments stop. The IRS can no longer file a lawsuit to collect and cannot start any new administrative collection actions.¹¹ The liability is dead from an enforcement standpoint.

Federal tax liens must be released as well. Under Section 6325, the IRS is required to issue a certificate of release within 30 days after the liability becomes legally unenforceable.¹² Some lien notices include language that makes the lien self-releasing on expiration of the collection period, but if your credit report or property records still show the lien after the CSED has passed, you can contact the IRS to request the formal certificate.

Refunds for Payments Made After the CSED

Payments sometimes keep flowing to the IRS after the CSED has passed, often through automatic payroll deductions or bank levies that were not released promptly. If you paid any amount on a tax debt after the collection statute expired, you can request a refund of those overpayments, provided you file the request before the Refund Statute Expiration Date.¹ The IRS may send you a letter about payments received beyond the collection period, but do not wait for it. Track your CSED independently and act quickly if money was taken after the deadline.

Tracking Your CSED Accurately

The most common mistake is counting ten years from the filing date and marking the calendar. Filing date and assessment date are usually close, but they are not always the same, and a few days matter when the clock is about to expire. Tolling introduces bigger complications. Someone who submitted an offer in compromise that took a year, then set up an installment agreement, then filed for bankruptcy has potentially added three or more years to the original ten.

Pull account transcripts for every tax year with a balance due, note the assessment dates and any tolling-related transaction codes, and add up the suspended time. If tolling events cross multiple years, the math gets complicated fast. Enrolled agents, CPAs, and tax attorneys who specialize in IRS resolution handle these calculations routinely and can verify the IRS’s own CSED dates, which are occasionally wrong. Getting the date right is worth the effort, because the difference between another year of aggressive collection and a legally unenforceable debt is a date on a transcript.

1
Internal Revenue Service. Time IRS Can Collect Tax
2
Office of the Law Revision Counsel. 26 USC 6502 – Collection After Assessment
3
Internal Revenue Service. Form 4506-T – Request for Transcript of Tax Return
4
Internal Revenue Service. IRS Master File Codes
5
Office of the Law Revision Counsel. 26 USC 6331 – Levy and Distraint
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Office of the Law Revision Counsel. 26 USC 6330 – Notice and Opportunity for Hearing Before Levy
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Office of the Law Revision Counsel. 26 USC 6503 – Suspension of Running of Period of Limitation
8
Office of the Law Revision Counsel. 26 USC 7508 – Time for Performing Certain Acts Postponed by Reason of Service in Combat Zone or Contingency Operation
9
Internal Revenue Service. IRM 5.17.4 – Suits by the United States
10
Internal Revenue Service. IRM 5.14.2 – Partial Payment Installment Agreements and the Collection Statute Expiration Date
11
Taxpayer Advocate Service. Collection Statute Expiration Date (CSED)
12
Office of the Law Revision Counsel. 26 USC 6325 – Release of Lien or Discharge of Property