Does "my accountant said it was fine" protect me from the IRS?
The claim: “My accountant said it was fine, so that ends the issue.”
Partly true: it depends on the facts behind the reliance
Partly. Under United States v. Boyle, 469 U.S. 241 (1985), relying on an agent to meet a filing deadline is not reasonable cause for a late return, but relying on an accountant's or attorney's advice on a substantive question of tax law can be. For accuracy-related penalties, IRC §6664(c) and Treas. Reg. §1.6664-4(c) require reasonable, good-faith reliance on advice based on all pertinent facts. The tax itself is still owed.
Reviewed by Ebot Mbi, CPA, EA · Last reviewed · Law and figures current as of September 17, 2026
Key takeaways
- Boyle: meeting a filing deadline is your own duty, and delegating it to an agent is not reasonable cause for late filing.
- Boyle also recognizes that relying on an accountant's or attorney's advice on a matter of tax law can be reasonable.
- Treas. Reg. §1.6664-4(c)(1) requires the advice to be based on all pertinent facts and not on unreasonable assumptions.
- IRM 20.1.1.3.2 makes reasonable cause a facts-and-circumstances determination, and IRM 20.1.1.3.2.2.5 addresses claims of erroneous advice or reliance.
- Penalty relief never removes the underlying tax.
Where the claim comes from
When an IRS notice arrives, many taxpayers respond that their accountant handled it or told them it was fine. That response feels complete, because the taxpayer relied on a professional in good faith.
Reliance can matter, but the law separates two situations: relying on someone to meet a deadline, and relying on someone's advice about what the law requires. The Supreme Court drew that line in Boyle.
What the law actually says
In United States v. Boyle, 469 U.S. 241 (1985), an executor relied on his attorney to file an estate tax return, and the return was filed late. The Supreme Court held that the failure to make a timely filing is not excused by the taxpayer's reliance on an agent, and that such reliance is not reasonable cause for a late filing under IRC §6651(a)(1). The Court explained that it requires no special training or effort to ascertain a deadline and make sure that it is met.
The Court distinguished reliance on substantive advice. It stated that when an accountant or attorney advises a taxpayer on a matter of tax law, such as whether a liability exists, it is reasonable for the taxpayer to rely on that advice.
For the accuracy-related penalty, IRC §6664(c)(1) bars the penalty on any portion of an underpayment where the taxpayer shows reasonable cause and good faith. Treas. Reg. §1.6664-4(b)(1) makes that a case-by-case determination based on all pertinent facts and circumstances. Treas. Reg. §1.6664-4(c)(1) requires, at a minimum, that the advice be based on all pertinent facts and circumstances and the law as it relates to them, and that it not rest on unreasonable factual or legal assumptions. The Tax Court often asks whether the adviser was a competent professional, whether the taxpayer provided necessary and accurate information, and whether the taxpayer actually relied on the advice in good faith (Neonatology Associates, P.A. v. Commissioner, 115 T.C. 43 (2000)).
IRS procedures follow the same structure. IRM 20.1.1.3.2 describes reasonable cause as based on all the facts and circumstances in each situation. IRM 20.1.1.3.2.2.5, on erroneous advice or reliance, first asks whether the taxpayer is claiming they followed specific advice or relied on someone else to comply on their behalf. It states that relying on another party to comply is generally not a basis for reasonable cause, particularly for filing or paying obligations, because the taxpayer is responsible for meeting their tax obligations and that responsibility cannot be delegated. Claims based on advice are evaluated under the ordinary business care and prudence standard and all the facts presented.
What is true and what is not
It is true that genuine reliance on qualified advice can support relief from accuracy-related penalties, and that Boyle itself recognizes reliance on advice about a matter of tax law. Separately, the IRS's first-time abatement policy may relieve failure-to-file and failure-to-pay penalties for taxpayers with a clean recent compliance history, whatever the reason for the lateness.
It is not true that the sentence alone ends the matter. Reliance does not excuse a missed deadline, does not help when you withheld facts or ignored obvious problems, and does not reduce the tax.
- Agent missed the filing deadline: generally not reasonable cause under Boyle.
- Adviser gave substantive advice based on full facts, and you followed it in good faith: may be reasonable cause.
- You gave incomplete information or the advice was unreasonable on its face: reliance is unlikely to help.
- Any outcome: the tax and interest on it remain owed.
What to do instead
Track your own filing and payment deadlines, even when a professional prepares the return, and confirm that returns were actually filed and accepted. Give your adviser complete facts, ask specific questions, and keep written advice and the documents you provided.
If a penalty has been assessed, request relief in writing. Explain the facts, attach the advice and records, and consider whether first-time abatement applies to any failure-to-file or failure-to-pay penalty.
How ebotCPA helps
We analyze the penalty, identify whether reasonable cause, first-time abatement, or another basis for relief fits your facts, and prepare the request with supporting documentation.
Book a $497 Case Analysis to have Ebot Mbi, CPA, EA review your facts before you act.
Assumptions: Tax year 2026 individual income tax return, filed and the $20,000 balance paid exactly three months after the unextended due date; no extension was filed.; Failure-to-file penalty of 5% per month, reduced by the 0.5% per month failure-to-pay penalty for the same months under IRC §6651(c)(1). Interest is not computed.; The taxpayer has no penalties in the prior three years, so first-time abatement may be available; reasonable cause based on the preparer's delay is not.
| Unpaid tax | $20,000 |
|---|---|
| Failure-to-file penalty (4.5% × 3 months × $20,000) | $2,700 |
| Failure-to-pay penalty (0.5% × 3 months × $20,000) | $300 |
| Total penalties before relief | $3,000 |
| Relief based on reliance on the preparer to file (Boyle) | Not available |
| Penalties if first-time abatement is granted | $0 |
| Tax still owed | $20,000 |
Under these assumptions, reliance on the preparer does not excuse the $3,000 of late-filing and late-payment penalties, though first-time abatement may, and the tax remains owed.
Illustration only; not a projection of your results.
Frequently asked questions
Is my accountant's mistake reasonable cause for a late filing penalty?
Generally no. Under United States v. Boyle, relying on an agent to file on time is not reasonable cause. First-time abatement may still be available if your recent history is clean.
When does reliance on a tax professional count as reasonable cause?
When the adviser was competent, you gave complete and accurate information, the advice addressed a substantive tax question, and you relied on it in good faith.
Does written advice matter?
Written advice is easier to prove and shows what facts the adviser considered. Keep it with the documents you provided.
If reasonable cause applies, do I still owe the tax?
Yes. Reasonable cause removes penalties, not the tax, and interest on the tax generally remains.
Have facts like these?
Book a $497 Case Analysis to have Ebot Mbi, CPA, EA review your facts before you act.