What is a PTIN?
Preparer Tax Identification Number
Short answer
A PTIN is the number every paid tax return preparer must have and renew each year. It goes on every return the preparer signs.
What it is
A PTIN (Preparer Tax Identification Number) is the IRS number a person must hold to prepare, or help prepare, federal tax returns for payment. It is personal, renewed every calendar year through the IRS online system, and printed in the paid-preparer box of each return.
Enrolled agents, CPAs and attorneys need one too. Staff who only key in data without exercising judgement do not, but the line is narrow: anyone who makes a decision about an entry on a return is a preparer.
Why it matters for a tax firm
Returns signed without a valid PTIN, or with an expired one, expose the preparer to penalties and the client to delays. Renewal opens each October. A firm should check every preparer's PTIN before the season starts.
Related terms
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Sources
Questions about PTIN
Is a PTIN the same as an EFIN?
No. A PTIN identifies a person who prepares returns. An EFIN identifies the firm that is allowed to e-file them. A sole practitioner usually has both.
When does a PTIN expire?
On December 31 each year. Renewal for the next year opens in mid-October.
Last reviewed: October 16, 2026. This glossary explains terms; it is not legal or tax advice. Check the cited source for the current rule.
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