A non-signing tax return preparer is anyone paid to work on a substantial portion of a federal tax return or refund claim without signing it, and federal law treats that person as a paid preparer with nearly all the same duties and penalties as the person whose signature appears on the return. If you calculate a major credit, prepare a schedule that drives the tax owed, or advise on the tax treatment of a completed transaction that shapes a large entry, you can be classified as a non-signing preparer even if you never see the final filing.
When Your Work Crosses the Line
Federal law defines a tax return preparer as any person who prepares a return or refund claim for compensation, including anyone who prepares a substantial portion of one.1Office of the Law Revision Counsel. 26 USC 7701 – Definitions Treasury regulations split that definition in two: the signing preparer has primary responsibility for accuracy and physically signs, and the non-signing preparer contributes to a substantial portion without signing.
The regulations give you a concrete safe harbor. Your work falls below the “substantial portion” threshold if the income, deductions, or credit amounts you handled are either less than $10,000, or both less than $400,000 and less than 20 percent of the taxpayer’s gross income (adjusted gross income for individuals).2eCFR. 26 CFR 301.7701-15 – Tax Return Preparer If you touched multiple schedules or entries on the same return, add them together before applying the safe harbor.
Timing of the advice also matters. Advice you give on a proposed transaction, before it happens, generally does not make you a preparer if you have no further input after the deal closes. Advice tied to events that have already occurred is different: if that advice directly determines a substantial entry on the return, you’re a non-signing preparer even if you never touch the document. There’s also a 5-percent rule for time. If post-event advice on the relevant positions accounts for less than 5 percent of your total time on the engagement, you typically fall outside the classification.
You Need a PTIN
Every person who receives compensation for preparing or helping prepare a federal return must have a Preparer Tax Identification Number.3Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers That applies whether you sign or not, and whether you worked on one return or a thousand.
Most preparers apply and renew online through the IRS PTIN system in about 15 minutes. The fee is $18.75 for 2026 and is non-refundable.4Internal Revenue Service. PTIN Requirements for Tax Return Preparers You’ll provide your Social Security number, business details, and any professional credentials, disclose felony convictions, and confirm you’re current on your own federal taxes. A felony conviction is not an automatic bar, but being incarcerated for one generally is.5Internal Revenue Service. Instructions for Form W-12 – IRS Paid Preparer Tax Identification Number (PTIN) Application and Renewal PTINs must be renewed each year.
Circular 230 Applies to You
Non-signing preparers do not escape the ethical rules by staying off the signature line. Treasury Department Circular 230 explicitly subjects anyone who prepares or assists in preparing a substantial portion of a tax submission to the conduct duties in Subpart B and the sanctions in Subpart C.6Internal Revenue Service. Treasury Department Circular No. 230
Two provisions hit hardest. Section 10.22 requires due diligence in preparing, approving, and filing tax documents, including verifying representations made to clients and the IRS. Section 10.34 prohibits advising a client to take a position, or preparing a portion of a return containing a position, that lacks a reasonable basis, is unreasonable, or reflects a willful attempt to understate tax.7eCFR. 31 CFR 10.34 – Standards With Respect to Tax Returns The circular’s best practices also call for documenting the questions you asked the taxpayer and the answers you received at the time. Those contemporaneous notes are often the evidence that decides a penalty case later.
Understatement Penalties Under Section 6694
The biggest financial exposure comes from Section 6694, which builds two tiers of penalties around how badly the work missed.
The first tier covers unreasonable positions. If you knew or should have known that a position lacked adequate support and it produced an understatement of tax, the penalty is the greater of $1,000 or 50 percent of the income you earned from that return.8Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer For a non-signing preparer charging several thousand dollars for specialized advice, the percentage calculation usually beats the flat floor.
The second tier targets willful or reckless conduct. When an understatement results from intentional disregard of the rules or a reckless approach to the facts, the penalty rises to the greater of $5,000 or 75 percent of the income derived from the return.8Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer That’s 75 percent, not the full fee, which matters when the numbers get large.
Reasonable Cause Defense
The first-tier penalty has an escape valve. No penalty applies if you can show reasonable cause for the understatement and that you acted in good faith.8Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer The IRS looks case by case at whether you used ordinary business care and prudence. This is where your contemporaneous notes prove their worth. The second-tier penalty for willful or reckless conduct has no reasonable cause defense, which is why the real gap between the tiers is much wider than the dollar figures suggest.
Administrative Penalties Under Section 6695
Section 6695 stacks a separate set of fines onto procedural failures. Each is smaller than the understatement penalties, but they add up quickly for a preparer who gets sloppy with compliance.
- Failing to include your PTIN on a return. The statutory amount is $50 per failure with a $25,000 annual cap, but the figures are adjusted for inflation. For returns filed in 2025 the amounts are $60 per failure and $31,500 for the year.9Office of the Law Revision Counsel. 26 USC 6695 – Other Assessable Penalties With Respect to the Preparation of Tax Returns for Other Persons10Internal Revenue Service. Tax Preparer Penalties
- Failing to keep either a copy of returns you helped prepare or a list of client names and taxpayer identification numbers. Same per-failure penalty and annual cap.
- Failing to furnish a copy of the completed return to the taxpayer. Same structure, aimed at signing preparers.
Each of these can be avoided by showing the failure was due to reasonable cause rather than willful neglect.
Due Diligence Penalty With No Cap
Section 6695(g) is different, and worse. It creates an uncapped penalty for preparers who fail to meet due diligence on returns claiming the earned income credit, the child tax credit, the American Opportunity credit, or head-of-household filing status.9Office of the Law Revision Counsel. 26 USC 6695 – Other Assessable Penalties With Respect to the Preparation of Tax Returns for Other Persons The base is $500 per failure, adjusted for inflation, and there is no annual ceiling. A preparer who processes many returns claiming these benefits and skips the due diligence steps faces enormous exposure. The obligation requires you to not ignore red flags in what a client tells you and to make reasonable inquiries when something looks wrong or incomplete.
Criminal Exposure
When carelessness becomes fraud, the consequences shift from civil to criminal. Willfully helping prepare a fraudulent return, or one that is false as to any material matter, is a felony carrying up to three years in prison and fines up to $100,000 ($500,000 for a corporation).11Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements Non-signing preparers are squarely covered because the statute reaches anyone who aids, assists, or advises in preparing a fraudulent document. The IRS can also seek a court injunction permanently barring a preparer from the industry, which ends a career without any prison sentence at all.
How Long the IRS Has to Come After You
The assessment window depends on which penalty is in play. For the first-tier understatement penalty under Section 6694(a) and the administrative penalties under Section 6695, the IRS has three years from either the client return’s due date or the date it was filed, whichever is later.12Internal Revenue Service. Preparer Penalty Procedures for SB/SE Employment Tax For the second-tier willful or reckless penalty under Section 6694(b), there is no statute of limitations. The same open-ended timeline applies to injunction actions. And extending the statute of limitations on the client’s return does not extend it for preparer penalties. Those clocks run independently.
You Probably Cannot Represent the Client in an Audit
This is where non-signing preparers most often misjudge their position. Whether you can represent the taxpayer during an audit or appeal depends entirely on your credentials, not on the work you did. Attorneys, CPAs, and enrolled agents have unlimited practice rights before the IRS. Everyone else is sharply restricted.
An unenrolled return preparer can only appear before revenue agents and customer service representatives. They cannot appear before appeals officers, revenue officers, or IRS counsel.13Internal Revenue Service. Publication 947, Practice Before the IRS and Power of Attorney They cannot execute closing agreements, extend assessment periods, or sign documents for the taxpayer. For returns prepared and signed after December 31, 2015, even that limited representation requires completing the IRS Annual Filing Season Program, a voluntary program built around continuing education, PTIN renewal, and consent to Circular 230.14Internal Revenue Service. Frequently Asked Questions: Annual Filing Season Program A PTIN holder without the AFSP and without other credentials has no representation rights for post-2015 returns. If you are an unenrolled non-signing preparer, that means no ability to help the client through an examination of the return you helped shape.
What to Keep and for How Long
Federal law requires preparers to keep either a completed copy of every return worked on or a list of client names and taxpayer identification numbers. The retention period is three years after the close of the return period, and the records must be available for IRS inspection on request.15Office of the Law Revision Counsel. 26 USC 6107 – Tax Return Preparer Must Furnish Copy of Return to Taxpayer and Must Retain a Copy or List
For a non-signing preparer, this means preserving the workpapers, calculations, and written advice behind the entries you passed to the signer. Digital storage is standard, but the system needs to be secure and quick enough to produce records if the IRS asks. If your work drove a schedule or entry that later gets audited, those records are your defense, both for showing due diligence under Circular 230 and for supporting reasonable cause if preparer penalties are proposed.