Introduction – What is Publication 4687?
IRS Publication 4687, titled “Paid Preparer Due Diligence,” is the primary handbook published by the Internal Revenue Service to guide professional tax preparers through their legal responsibilities. It outlines the specific steps preparers must take when filing tax returns that claim high-value refundable tax credits and specific filing statuses.
According to the official IRS release data, the latest revision is IRS Publication 4687 (Rev. 9-2026), bearing a revision date of September 2026 and officially posted by the IRS on September 18, 2026. This updated version ensures tax practitioners are aligned with current compliance benchmarks, updated credit guidelines, and strict verification rules for the upcoming filing season.
Due diligence means taking reasonable steps and asking appropriate questions to verify that client tax claims are honest, accurate, and fully supported by law. This publication ensures that tax preparers act as the first line of defense against erroneous or fraudulent claims on federal tax returns.
Who Should Read This Publication
The primary audience for Publication 4687 is paid tax return preparers, including Certified Public Accountants (CPAs), Enrolled Agents (EAs), tax attorneys, and un-enrolled preparers who file returns for compensation. Firm owners and tax office managers should also read it to build standardized onboarding and review procedures for their staff.
Students studying federal taxation or financial planning will find this publication helpful to understand real-world compliance duties. Everyday taxpayers can benefit from reading it as well, because it explains why legitimate tax preparers ask detailed, personal questions before filing their tax forms.
Key Topics Covered
Publication 4687 covers the mandatory compliance standards set under Treasury Regulation Section 1.6695-2. It breaks down the requirements into clear operational guidelines that every preparer must follow.
- The Four Core Due Diligence Requirements: The administrative checklist, calculation worksheets, interview knowledge rules, and document retention rules.
- Covered Tax Benefits: Specific rules applying to the Earned Income Tax Credit (EITC), Child Tax Credit (CTC), Additional Child Tax Credit (ACTC), Credit for Other Dependents (ODC), American Opportunity Tax Credit (AOTC), and Head of Household (HOH) filing status.
- Client Interview Standards: How to evaluate client statements and identify inconsistencies or missing information.
- Penalty Structures: An explanation of statutory fines under Internal Revenue Code Section 6695(g) for failing to meet due diligence requirements.
Detailed Breakdown of Main Concepts
The core of Publication 4687 revolves around four mandatory pillars. Failing to complete any single pillar can lead to significant financial penalties for the tax practitioner.
1. Complete and Submit Form 8867
Preparers must complete Form 8867 (Paid Preparer’s Due Diligence Checklist) for every tax return claiming any of the covered credits or Head of Household status. The completed checklist must be submitted electronically or attached to paper filings, with all questions answered accurately based on client facts.
2. Compute the Credits Correctly
The preparer must calculate each tax credit using the official IRS calculation worksheets found in the Form 1040 instructions or other related tax guides. Preparers can use professional tax software to perform these calculations, provided they review the outputs for computational accuracy.
3. Meet the Knowledge Requirement
Preparers cannot simply accept information from a client if it appears incorrect, inconsistent, or incomplete. Under this requirement, the tax professional must ask reasonable follow-up questions whenever a sensible, well-informed person would suspect an issue, and they must write down those questions and answers immediately.
4. Keep Thorough Records
Preparers must maintain a secure paper or electronic archive of all working documents for at least three years. This file must contain Form 8867, calculation worksheets, notes explaining when and how facts were obtained, and copies of any documents the client provided that were relied upon to claim the tax benefits.
Practical Examples or Scenarios
Publication 4687 provides practical examples to show how due diligence functions during everyday tax interviews. These scenarios demonstrate the line between accepting client facts and making reasonable inquiries.
Scenario 1: Claiming a Niece or Nephew
A new client visits a preparer and wishes to claim their 6-year-old nephew for the Earned Income Tax Credit. Because the child is not the client’s direct son or daughter, the preparer must ask where the biological parents live and confirm that the child lived with the client for more than half the year. The preparer documents the family situation and records notes showing why the client has legal custody or primary care.
Scenario 2: Cash-Only Self-Employment Income
A taxpayer reports earning exactly $10,000 in cash doing yard maintenance, with zero reported business expenses, placing them in the maximum refund bracket for the EITC. A knowledgeable preparer cannot accept this round figure at face value. The preparer must inquire about customer logs, mileage books, equipment purchases, and receipt books to verify that the business and income are legitimate.
How This Publication Relates to Specific Forms
Publication 4687 acts as an instructional manual that links individual tax returns to specific schedules and compliance disclosures. The following table highlights the primary tax forms associated with this publication.
| Tax Form | Form Name / Role | Relevance to Publication 4687 |
|---|---|---|
| Form 8867 | Paid Preparer’s Due Diligence Checklist | The mandatory due diligence form that must be completed and submitted with every eligible return. |
| Schedule EIC | Earned Income Credit Qualifying Child Information | Used to report qualifying child details, subject to strict age, residency, and relationship checks. |
| Schedule 8812 | Credits for Qualifying Children and Other Dependents | Used to compute the Child Tax Credit and Additional Child Tax Credit following due diligence guidelines. |
| Form 8863 | Education Credits (American Opportunity and Lifetime Learning) | Requires verification of qualified tuition expenses, student half-time enrollment status, and eligible institutions. |
Common Misunderstandings Clarified
A widespread misconception is that due diligence requires tax preparers to act as private investigators or law enforcement officers. In reality, preparers are not required to conduct independent background checks, but they cannot ignore obvious red flags or nonsensical claims.
Another common mistake is believing that taxpayers who file their own returns need to complete Form 8867. Due diligence rules and Publication 4687 apply exclusively to paid tax return preparers, not self-filers using retail software.
Finally, some preparers assume that saving a copy of Form 8867 in their software is sufficient. The IRS clearly states that preparers must also maintain contemporaneous written notes showing what questions were asked, who answered them, and the specific date the discussion occurred.
Why This Publication Matters for Taxpayers
While Publication 4687 is targeted at professionals, everyday taxpayers feel its direct effects during their tax appointments. When a tax preparer asks for school records, medical bills, or lease agreements, they are not doubting the taxpayer’s honesty; they are fulfilling their legal obligations under federal law.
Working with a preparer who follows Publication 4687 protects taxpayers from severe audit penalties and delayed refund checks. If an unverified credit is disallowed by the IRS, the taxpayer may face an outright ban from claiming that credit for two to ten years.
Frequently Asked Questions
What is the penalty for a preparer who fails due diligence?
The IRS imposes an indexed penalty under Internal Revenue Code Section 6695(g) for each failure to meet due diligence rules. This penalty applies separately to each credit claimed on a return, meaning a single return with multiple credit errors can generate several thousand dollars in fines for the preparer.
Do preparers have to demand original birth certificates or receipts?
No, preparers are not universally required to inspect original birth certificates or receipts for every client. However, if the client’s information seems contradictory or unreliable, the preparer must request supporting documentation before signing the tax return.
How long must tax preparers keep due diligence files?
Preparers must keep complete due diligence records for a minimum of three years from the date the return was due or filed, whichever is latest. These files must be made available promptly if requested during an IRS compliance review.
Conclusion
IRS Publication 4687 plays a crucial role in maintaining fairness and accuracy throughout the United States tax system. By setting clear standards for interviews, calculations, checklists, and records, it shields both preparers and taxpayers from costly filing errors.
Whether you are a tax professional reviewing the September 2026 revision or a curious taxpayer preparing for your annual appointment, understanding these due diligence rules ensures a transparent and smooth filing experience.
