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IRS statutes of limitation, explained by a tax attorney

Every IRS clock has a start, a pause and an end.

The IRS gets a fixed window to assess tax, another to collect it, and you get one to claim money back. Those windows open on specific dates, stop for specific events and close for good. Knowing which clock you are on is the first move in every case I handle.

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Written by Darrin T. Mish, admitted to The Florida Bar in 1993 and to the United States Tax Court.

The three federal tax clocks

  1. ASED Assessment

    3 yrs

    from filing, IRC 6501(a)

  2. RSED Refund claim

    3 yrs / 2 yrs

    IRC 6511(a)

  3. CSED Collection

    10 yrs

    from assessment, IRC 6502(a)

Base periods only. Fraud, unfiled returns, consents, deficiency notices, bankruptcy and pending requests change the math. Each exception has its own guide on this site.

Start here

The three clocks

ASED

How long the IRS has to assess

Three years from the date the return was filed is the base rule. A big omission, fraud or no return at all changes the answer.

Read the rules →

CSED

How long the IRS has to collect

Ten years from assessment, unless something suspends the clock. Most of the fights in collection cases are about what counts.

Read the rules →

RSED

How long you have to claim a refund

Three years from filing or two years from payment, and a separate cap on how much you can get back. Miss it and the money stays put.

Read the rules →

The deadline guides

Every rule, on one calendar

Thirty guides to the legal rules behind IRS deadlines: what starts each clock, what stops it and how to use the timing in your favor.

AssessmentAssessment Deadlines (ASED)

  1. The Three-Year Assessment Statute: When the IRS Runs Out of Time to Assess

    3 years from the date the return is filed

  2. The Six-Year Rule: When Omitted Income Doubles the IRS Assessment Window

    6 years from filing when omitted income exceeds 25%

  3. No Return, No Clock: Why Unfiled Years Stay Open to IRS Assessment

    No limit until a valid return is filed

  4. The Fraud Exception: When the IRS Assessment Statute Never Expires

    No limit

  5. Form 872 Consents: Your Right to Refuse or Limit an IRS Statute Extension

    Only by written consent signed before the deadline

  6. Payroll Tax Statutes of Limitation: The April 15 Rule for Quarterly Returns

    3 years from April 15 of the following year

  7. Amended Returns and IRS Deadlines: What Filing a 1040-X Does and Does Not Change

    Assessment window stays open 60 days after receipt

  8. Unfiled Foreign Information Returns Keep the Whole Tax Year Open

    Open until 3 years after the information is furnished

  9. Prompt Assessment Requests: Shortening the IRS Clock to 18 Months With Form 4810

    18 months after the request, never later than 3 years after filing

  10. How a Notice of Deficiency Stops the IRS Assessment Clock

    90 days (150 if abroad), plus any Tax Court case, plus 60 days

  11. Transferee Liability Deadlines: How Long the IRS Has to Pursue People Who Received Assets

    1 year after the transferor's period ends

CollectionCollection Deadlines (CSED)

  1. The Ten-Year Collection Statute: The Legal Rules Behind the CSED

    10 years from each assessment

  2. What Pauses the IRS Collection Clock: Every CSED Suspension Event Explained

    Clock stops, then resumes where it left off

  3. Form 900 Collection Statute Waivers: When the IRS Can Extend the Ten Years

    Only with an installment agreement or a post-CSED levy release

  4. When the IRS Sues to Beat the Clock: Suits to Reduce Tax Assessments to Judgment

    Collection continues until the judgment is satisfied or unenforceable

  5. Planning the Final Years of the IRS Collection Statute

    12 months or less remaining

  6. Money the IRS Takes After the Collection Statute Expires Is an Overpayment

    Treated as an overpayment

RefundsRefund Deadlines (RSED)

  1. The Refund Statute: How Long You Have to Claim Money Back From the IRS

    3 years from filing or 2 years from payment, whichever is later

  2. The Refund Lookback Rule: Why a Timely Claim Can Still Recover Nothing

    Tax paid in the 3 years plus extension before the claim

  3. Deemed Payment Dates: When the IRS Says Your Withholding Was Paid

    Deemed paid on the 15th day of the 4th month after year end

  4. Late Returns and Lost Refunds: The Three-Year Window for Unfiled Years

    Return must be filed within 3 years of the original due date

  5. Protective Refund Claims: How to Hold Your Place Before the Deadline Passes

    Preserves a contingent refund before the RSED expires

  6. Financial Disability: The One Way to Stop the Refund Clock for Illness

    Suspended while the individual is financially disabled

  7. The Refund Suit Deadline: Two Years From the IRS Disallowance Letter

    2 years from mailing of the notice of disallowance

  8. When the IRS Wants Its Money Back: Erroneous Refund Suits and Their Deadlines

    2 years from the refund (5 if induced by fraud or material misrepresentation)

  9. Longer Refund Windows: Bad Debts, Worthless Securities, Carrybacks and Foreign Tax Credits

    7 years from the return due date

Tolling & filingFiling, Mailing & Tolling Rules

  1. The Last Known Address Rule: Why an IRS Notice You Never Saw Can Still Start the Clock

    Mailed to your last known address = legally sufficient

  2. The Mitigation Provisions: Reopening a Closed Year When the Same Item Is Taxed Twice

    As if 1 year remained after the determination

  3. The Mailbox Rule for IRS Deadlines: When the Postmark Is the Filing Date

    Treated as filed on the postmark date

  4. Can a Missed IRS Deadline Be Excused? Equitable Tolling After Brockamp and Boechler

    Not subject to equitable tolling

From the archive

Rights & procedure library

Earlier guides on hearings, appeals, resolution options and emergency procedures.

Talk it through

Know which clock you are on before you act.

One call with a tax attorney maps your assessment, collection and refund dates and the moves that fit them. The first consultation is free.

Call (813) 229-7100Or see how consultations work