IRS Accuracy-Related Penalties: 20% & 40% Explained
Last updated 09/16/2025 by
Andrew Latham
Edited by
Andrew Latham
Summary:
Quick answer: The IRS accuracy-related penalty is usually 20% of the underpayment caused by negligence or substantial understatement. It rises to 40% for gross valuation misstatements. Relief may be possible if you can show reasonable cause or relied on professional advice.
Accuracy-related penalties are among the most common IRS charges after failure-to-file and underpayment penalties. They can be steep, but understanding the triggers and defenses can save you thousands.
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When IRS accuracy penalties apply
The IRS can impose an accuracy-related penalty if it finds your tax return contains significant errors or you disregarded rules. Common triggers include:
- Negligence: Failing to make a reasonable attempt to comply with tax laws.
- Substantial understatement: Understating your tax by more than the greater of 10% of the correct amount or $5,000.
- Valuation misstatements: Overstating deductions or credits due to inflated asset values.
20% vs. 40% penalty explained
| Situation | Penalty Rate | Example |
|---|---|---|
| Negligence or disregard of IRS rules | 20% | Failing to keep records and deducting unsupported expenses |
| Substantial understatement of income tax | 20% | Reporting $40,000 tax owed when the correct liability was $55,000 |
| Gross valuation misstatement | 40% | Claiming a $200,000 charitable donation for property worth $20,000 |
Common triggers and examples
- Claiming deductions without receipts or logs.
- Overstating business expenses for self-employed work.
- Relying on aggressive tax shelters without documentation.
- Overvaluing charitable contributions or property basis.
Penalty relief options
There are defenses that may reduce or eliminate accuracy-related penalties:
- Reasonable cause: If you acted with ordinary care but circumstances prevented accuracy (illness, disaster, missing records).
- Reliance on professional advice: If you can show you reasonably relied on a qualified tax professional.
- First-Time Penalty Abatement: May apply in some cases if you otherwise have a clean compliance record.
How to prevent accuracy-related penalties
- Keep detailed receipts and documentation for deductions and credits.
- Use reputable tax software or a qualified preparer.
- Cross-check IRS guidance on complex issues.
- Avoid inflating valuations for property or donations.
IRS notices to watch for
Accuracy penalties often surface after IRS reviews or audits. Common notices include:
- CP2000 — Underreported income notice
- Audit letters — Requesting more information or adjustments
Real-Life Scenarios
Examples of how accuracy-related penalties have been addressed:
- Negligence penalty removed: A taxpayer relied on incorrect written IRS guidance. With documentation, they received penalty relief under reasonable cause.
- Substantial understatement: An investor misreported stock basis, triggering a 20% penalty. They amended the return and negotiated a reduction through an Offer in Compromise.
- Valuation misstatement: A property owner overstated a deduction. After an appeal, the IRS dropped the 40% penalty, keeping only tax owed and interest.
Takeaway: If errors were unintentional or based on reasonable reliance, accuracy-related penalties may be reduced or removed.
Trusted Tax Relief Companies
If you’re facing accuracy-related penalties tied to a larger tax debt, professional help may be worth it:
Optima Tax Relief helps clients negotiate with the IRS, including penalty relief and audit representation.
Justice Tax Relief specializes in audit defense, penalty removal, and complex IRS negotiations.
Key Takeaways
- The IRS accuracy-related penalty is 20% in most cases, 40% for gross valuation misstatements.
- Negligence, substantial understatement, and inflated valuations are common triggers.
- Relief is possible through reasonable cause, reliance on professional advice, or penalty abatement.
- Prevention starts with documentation, compliance, and conservative reporting.
Next Steps
- See how IRS Penalties compare and when they apply.
- Learn how to remove penalties with First-Time Penalty Abatement or Reasonable Cause Relief.
- Explore broader options like an Offer in Compromise or IRS Installment Agreement if you owe a larger balance.
Related Guides
- Failure-to-File vs. Failure-to-Pay Penalties — Which costs more and how to fix it fast.
- IRS Underpayment Penalty — Safe harbor rules, calculation, and relief explained.
- Reasonable Cause Penalty Relief — How to argue for penalty removal with documentation.
- IRS Notices & Letters Guide — What common IRS letters mean and how to respond.
Common Questions
Is negligence the same as tax fraud?
No. Negligence is a lack of reasonable care and triggers a 20% penalty. Fraud involves intentional wrongdoing and carries penalties up to 75% plus possible criminal charges.
Can both the 20% and 40% penalties apply?
No. The IRS applies one accuracy-related penalty per portion of underpayment, either 20% or 40%, depending on the circumstances.
Can accuracy penalties be waived?
Yes, if you show reasonable cause or that you relied on professional advice. First-time abatement may also apply in some cases.
How do I avoid accuracy-related penalties?
Keep documentation, avoid inflating deductions, follow IRS guidance, and seek qualified tax advice for complex issues.
Andrew is the Content Director for SuperMoney, a Certified Financial Planner®, and a Certified Personal Finance Counselor. He loves to geek out on financial data and translate it into actionable insights everyone can understand. His work is often cited by major publications and institutions, such as Forbes, U.S. News, Fox Business, SFGate, Realtor, Deloitte, and Business Insider.
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