CSED stands for Collection Statute Expiration Date. It is the deadline after which the IRS can no longer legally collect a federal tax debt from you. Under 26 U.S.C. ยง 6502, the agency generally has ten years from the date it formally assesses a tax liability to collect the balance through levies, liens, or lawsuits.1Office of the Law Revision Counsel. 26 USC 6502 Collection After Assessment Once that window closes, the debt is effectively gone, along with any accumulated penalties and interest. Certain actions by both the IRS and the taxpayer can pause the clock, so the real expiration often falls later than a simple ten-year count from the assessment date.
The Ten-Year Rule in Plain Terms
Congress built the ten-year limit into Internal Revenue Code Section 6502 to keep the IRS from chasing old debts indefinitely.1Office of the Law Revision Counsel. 26 USC 6502 Collection After Assessment If the agency doesn’t collect the full balance within that window, the legal obligation to pay is removed. The one narrow exception: if you sign a written agreement extending the collection period as part of a partial payment installment arrangement, the IRS can collect beyond the ten years, but only up to 90 days past the agreed extension date.2Office of the Law Revision Counsel. 26 US Code 6502 – Collection After Assessment
When the Clock Starts
The countdown begins on the date the IRS formally assesses the tax, not the day you file your return. Assessment is when the agency officially records the liability on its internal books, usually a few weeks after a return is processed. File on April 15, and if the IRS doesn’t assess until June 1, the CSED runs from June.1Office of the Law Revision Counsel. 26 USC 6502 Collection After Assessment
Each tax year you owe carries its own assessment date and its own CSED. If you have unpaid balances from both 2019 and 2020, each liability has a separate clock. One debt might expire while the other remains collectible for another year. You don’t have a single CSED; you have as many as the number of tax years with outstanding balances.
When the IRS adjusts your liability after an audit, the additional assessment gets a fresh ten-year clock. The original self-reported amount keeps its original CSED, but the audit-generated increase starts from the date the IRS records the adjustment. A single tax year can therefore have two different expiration dates: one for the amount you reported and one for the amount added later.
What Pauses the Clock
Several actions trigger “tolling,” which freezes the ten-year countdown and pushes the CSED further into the future. Every day the clock is frozen adds a day to the back end. Many of the moves people make to get relief from collection activity are the same moves that extend how long the IRS can collect, so it’s worth knowing which is which before you file anything.
Bankruptcy
Filing for bankruptcy suspends the CSED from the date you petition through the date the court closes, dismisses, or discharges the case, plus an additional six months.3Internal Revenue Service. Time IRS Can Collect Tax A bankruptcy that takes two years to resolve pushes the CSED forward by roughly two and a half years.
Offer in Compromise
Submitting an Offer in Compromise pauses the clock while the IRS evaluates your proposal. If the IRS rejects the offer, the suspension continues for another 30 days to allow an appeal. If you do appeal, the pause extends through the entire appeals process.4Internal Revenue Service. 5.1.19 Collection Statute Expiration A contested Offer in Compromise that drags on for 18 months adds roughly that same amount of time to the CSED.
Installment Agreement Requests
This is where taxpayers get tripped up. Requesting an installment agreement, typically through Form 9465, pauses the clock while the IRS considers your application. If the request is rejected, the suspension continues for 30 days. If an agreement is terminated, the CSED is suspended for another 30 days after termination, and during any appeal of the rejection or termination.5Internal Revenue Service. 5.14.2 Partial Payment Installment Agreements and the Collection Statute Expiration Date
Once the IRS accepts your installment agreement and you start making payments, the CSED is no longer suspended. The clock resumes running. The Internal Revenue Manual is explicit: “The CSED is not suspended while an installment agreement is in effect.”4Internal Revenue Service. 5.1.19 Collection Statute Expiration An active agreement can actually work in your favor. You make affordable monthly payments while the clock ticks down, and if the CSED arrives before you’ve paid the full balance, the remaining amount is no longer collectible.
Collection Due Process Hearings
Requesting a Collection Due Process hearing after receiving a Notice of Federal Tax Lien Filing or a Final Notice of Intent to Levy suspends the CSED from the date the IRS receives your request until you withdraw it or the IRS Independent Office of Appeals issues a final determination, including any subsequent court appeals.3Internal Revenue Service. Time IRS Can Collect Tax
Innocent Spouse Relief
Filing Form 8857 to request innocent spouse relief pauses the collection clock from the date the IRS receives your form until the case is fully resolved, including any time the Tax Court spends reviewing it. After the case closes, the CSED is extended by the entire length of the suspension plus an additional 60 days.6Internal Revenue Service. Publication 971 Innocent Spouse Relief
Living Abroad or Serving in a Combat Zone
If you live outside the United States for a continuous period of six months or more, the CSED is suspended for the entire time you’re abroad, and the collection period may be extended by at least six additional months after you return.3Internal Revenue Service. Time IRS Can Collect Tax Service members in a designated combat zone, contingency operation, or qualified hazardous duty area receive a suspension from the date they enter the zone through the exit date plus 180 days.4Internal Revenue Service. 5.1.19 Collection Statute Expiration
What Does Not Pause the Clock
Not every IRS action tolls the CSED. Being placed in Currently Not Collectible status, where the IRS temporarily halts collection efforts because you can’t afford to pay, does not suspend the ten-year clock. The IRS may shelve your account, but the countdown keeps running in the background. That makes CNC status one of the most favorable positions for a taxpayer who owes more than they can pay: no monthly payments, no active collection, and the CSED ticking steadily toward expiration.
Annual balance-due reminders (CP71 notices) also do not extend the CSED. The IRS sends these each year to inform you of the remaining balance, and the notices themselves confirm they will continue until the statute of limitations for collection expires. They are informational only.
How to Find Your CSED
The IRS does not print the CSED on notices or correspondence. The most reliable way to work it out is to pull your IRS Account Transcript for the tax year in question, either through the Get Transcript tool at IRS.gov or by mailing Form 4506-T.7Internal Revenue Service. Get Your Tax Records and Transcripts The transcript shows the history of every transaction, payment, and adjustment for that year.
On the transcript, look for Transaction Code 150, which marks the date of your original assessment and starts the ten-year clock. Other codes flag tolling events. Transaction Code 480 indicates a pending Offer in Compromise. Transaction Code 971 with Action Code 043 marks a pending installment agreement suspension, while TC 971 with AC 063 signals that the suspension ended because the agreement was established.4Internal Revenue Service. 5.1.19 Collection Statute Expiration Transaction Code 520 with certain closing codes signals IRS litigation that may also suspend the CSED.8Internal Revenue Service. Section 8A Master File Codes – Transaction, MF and IDRS
Calculating the exact CSED requires adding up every tolling period and tacking those days onto the original ten-year mark. If you believe the IRS has the date wrong, you can dispute it through the IRS Independent Office of Appeals.9Internal Revenue Service. Preparing a Request for Appeals Keep in mind that a Collection Due Process hearing request will itself pause the CSED while the dispute is resolved.
What Happens When the CSED Expires
Once the CSED passes, the IRS loses all authority to collect that specific debt. The agency cannot levy bank accounts, garnish wages, or file a lawsuit for the expired balance.10Taxpayer Advocate Service. Collection Statute Expiration Date (CSED) Any federal tax lien recorded against your property must be released within 30 days of the expiration date.11Taxpayer Advocate Service. Lien Release If the IRS doesn’t release it on time, you can contact the agency or the Taxpayer Advocate Service to push the process along.
The IRS also cannot offset your future tax refunds against a liability whose CSED has already expired. Internal procedures require that a refund credit be applied only to the earliest unexpired liability.12Internal Revenue Service. 21.4.6 Refund Offset Research, Reversals, and Injured Spouse Processing If a refund is applied to a year you believe is past its CSED, that’s worth investigating right away.
One detail surprises most taxpayers. If you voluntarily send a payment on a debt that has passed its CSED, the IRS is required to tell you the payment is not legally required and to ask whether you want the money returned. The agency cannot solicit voluntary payments on expired debts, and any payment you insist on making is treated as a gift to the U.S. Treasury rather than a tax payment.4Internal Revenue Service. 5.1.19 Collection Statute Expiration Once the CSED is gone, you truly owe nothing.
A Note on State Tax Debt
The ten-year CSED applies only to federal tax debt owed to the IRS. State tax agencies operate under their own collection statutes, which vary widely. Some states allow as few as six years; others permit 20 years or have no expiration at all for certain liabilities like unfiled returns. If you owe state taxes alongside a federal balance, check with your state’s department of revenue for the applicable collection period.