Definition
A Preparer Tax Identification Number (PTIN) identifies a paid tax return preparer on the returns they prepare. Anyone who prepares or helps prepare all or substantially all of a federal return for compensation must have one, and must renew it each year. CPAs, attorneys, and enrolled agents are not exempt from the PTIN requirement when they prepare returns for pay. The preparer registers through the IRS online system.
Why it matters in an audit or review
PTINs matter to firms because staff who work on tax returns need current numbers, and a firm's compliance program should track renewals. Staff who occasionally help prepare returns should check whether their role meets the all-or-substantially-all test; a clerical employee who only enters data does not. The IRS can penalize a paid preparer who does not furnish an identifying number on a return (IRC section 6695(c)).
Example
Illustrative: a manager prepares a client's partnership return in busy season but has not renewed the PTIN for the new year. The firm's checklist catches the lapse before filing, and the manager renews it first.
Common mistakes
Letting a PTIN lapse at year end and filing returns under the expired number.
FAQ
Does an audit-only professional need a PTIN?
Generally not, unless they prepare returns for compensation.
Sources
- 26 CFR 1.6109-2, Furnishing identifying number of tax return preparer
- https://www.ecfr.gov/current/title-26/section-1.6109-2
- IRS, PTIN Requirements for Tax Return Preparers
- https://www.irs.gov/tax-professionals/ptin-requirements-for-tax-return-preparers
- Internal Revenue Code section 6695(c), failure to furnish identifying number
Definitions paraphrase AICPA and FASB guidance; read the standard itself before relying on a requirement. Example figures are illustrative. This page is guidance, not professional advice. Report an error