If your tax preparer made a mistake on your return, you are the one the IRS will come after for the unpaid tax, penalties, and interest, because the signature on the return is yours. The fix has four parts that run in parallel: file an amended return on Form 1040-X, pay any new balance immediately to stop penalties growing, ask the IRS to remove the penalties, and pursue the preparer separately for the costs their error caused you.
You Still Owe the Tax
This is the part most people resist, and it is worth settling first. When you signed the return, you took on responsibility for everything on it. The IRS does not care that you paid someone else to do the math. If the return understated your income or overstated your deductions, the additional tax is yours. Pointing at a negligent preparer does not change what you owe the government.
The preparer is not off the hook entirely. Federal law imposes separate penalties on preparers who cause understatements, and those penalties come out of the preparer’s own pocket.1Office of the Law Revision Counsel. 26 U.S. Code 6694 – Understatement of Taxpayer’s Liability by Tax Return Preparer But that is a separate track. Your job is to get the return corrected, pay what is due, then go after the preparer for what their mistake cost you.
Your strongest protection throughout all of this is documentation. Pull together every email, every document you handed over, and the engagement letter you signed. If the preparer ignored correct figures you gave them, that paper trail proves fault was theirs. If you handed over bad numbers, the blame shifts back to you.
What Penalties and Interest Are Running Right Now
Three penalties show up most often when a preparer’s error leads to additional tax, and they can stack.
- Failure-to-pay penalty: 0.5 percent of the unpaid tax for each month it remains unpaid, capped at 25 percent.2Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
- Failure-to-file penalty: 5 percent per month of the unpaid tax, capped at 25 percent, which applies if your preparer never actually filed the return. When both penalties apply in the same month, the failure-to-file amount is reduced by the failure-to-pay amount.3Internal Revenue Service. Failure to File Penalty
- Accuracy-related penalty: a flat 20 percent of the underpayment where the understatement is due to negligence or is “substantial.” Substantial means more than the greater of $5,000 or 10 percent of the tax that should have been shown.4Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
Interest runs on top of all of this, from the original due date of the return. For the first quarter of 2026, the individual underpayment rate is 7 percent, compounded daily.5Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 Interest is almost never waived. It stops only when the balance is paid.
File an Amended Return on Form 1040-X
The correction tool is Form 1040-X, Amended U.S. Individual Income Tax Return. You generally have three years from the date you filed the original return, or two years from the date you paid the tax, whichever is later.6Internal Revenue Service. File an Amended Return Miss that window and you lose the ability to claim a refund on the corrected figures.
Pull Your Documents First
Gather every record tied to the error: corrected W-2s or 1099s, receipts for deductions that were miscalculated, and any schedules from the original return that need updating. Then calculate the correct tax yourself, or hire a different preparer to do it. The difference between what you originally reported and the right numbers is the core of your amended return.
Complete the Form
Form 1040-X uses three columns: what you originally reported, the corrected figures, and the difference. Part III asks you to explain the changes. Be specific. “My preparer failed to include $12,000 in 1099-NEC income” tells the IRS something; “preparer error” does not. Attach any corrected schedules and supporting documents.
You can e-file Form 1040-X for the current tax year and the two prior years. Older years, or amendments for a prior year where the original was filed on paper earlier in the current year, must be mailed.7Internal Revenue Service. About Form 1040-X, Amended U.S. Individual Income Tax Return Processing typically takes 8 to 12 weeks, sometimes up to 16.8Internal Revenue Service. Amended Return Frequently Asked Questions You can track it with the “Where’s My Amended Return?” tool on the IRS website.
Filing an amendment does not, by itself, restart the three-year audit clock on your original return. The clock still runs from when the original was filed.
Pay the New Balance Immediately
Here is where people lose money unnecessarily. Many file the amended return and wait to pay until the IRS processes it. Penalties and interest keep running from the original due date, not from the date the IRS gets around to reviewing your 1040-X. If the corrected return shows a balance, pay it when you submit the amendment. The IRS accepts electronic payments directly on its website, and you can authorize a direct debit at the time of e-filing.9Internal Revenue Service. Instructions for Form 1040-X Every day of delay adds to the total.
Cannot pay in full? Paying something still reduces the base that penalties and interest accrue on. An installment agreement drops the monthly failure-to-pay penalty from 0.5 percent to 0.25 percent for as long as the agreement is active.2Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
Get the Penalties Removed
Penalties are negotiable in ways interest is not. The IRS offers two main paths, and they cover different penalties. Picking the wrong one wastes your time.
First Time Abatement
If you have a clean compliance record for the three years before the penalty year, you can request First Time Abatement. The requirements: you filed all required returns for those three prior years, you had no penalties assessed during that period (or any were removed for an acceptable reason), and you have paid or arranged to pay the current balance.10Internal Revenue Service. Administrative Penalty Relief
The limit is scope. First Time Abatement only wipes out failure-to-file, failure-to-pay, and failure-to-deposit penalties. It does not touch the 20 percent accuracy-related penalty, which is the one most commonly triggered by preparer errors that understate tax. Request it by calling the number on your IRS notice. Many representatives can approve it during the call.
Reasonable Cause
For the accuracy-related penalty, you have to argue reasonable cause. This is where reliance on a tax professional actually matters. The IRS looks at whether you gave the preparer complete and accurate information, whether the preparer had the expertise for your situation, and whether your reliance was objectively reasonable given the complexity involved.11Internal Revenue Service. Reasonable Cause and Good Faith
One important limit: the Internal Revenue Manual states that your duty to file and pay on time generally cannot be excused by reliance on a tax advisor.12Internal Revenue Service. 20.1.1 Introduction and Penalty Relief “My preparer told me I did not need to file” is unlikely to get a failure-to-file penalty removed through reasonable cause. Use First Time Abatement for those, and save reasonable cause for the accuracy-related penalty where it carries real weight.
For the accuracy-related penalty, submit a written request using Form 843, Claim for Refund and Request for Abatement.13Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement Lay out the facts: what information you gave the preparer, what the preparer did wrong, and why you had no reason to suspect the error. Wait until the IRS has finished processing your amended return and formally assessed the penalty before sending this.
Amend Your State Return Too
A federal change almost always affects your state tax.14Internal Revenue Service. Topic No. 308, Amended Returns Most states require an amended state return within a set window after a federal adjustment, commonly 60 to 180 days depending on where you live. Some states treat failure to report the federal change as its own violation with separate penalties. Contact your state tax agency as soon as you file the federal amendment. If the same preparer handled both returns, the state return likely has the same errors.
Get Your Money Back From the Preparer
Correcting the return is one track. Getting compensated for the costs of the preparer’s negligence is another, and you should not wait for the first to finish before starting the second.
What You Can Recover
The general rule in professional malpractice is that you can recover costs that would not have existed if the preparer had done the job right. That typically covers penalties, interest, the fee you paid the preparer, and fees paid to a second professional to fix the error. You generally cannot recover the underlying tax itself if it was money you legitimately owed anyway. The test is causation: would the cost exist without the preparer’s mistake?
One wrinkle: if the preparer reimburses you for penalties or interest, that payment may be taxable income depending on what it is replacing. Keep records of any settlement and ask a new advisor how to report it.
How to Pursue It
Start with a direct written demand. Send the preparer a copy of the amended return, the IRS notice showing penalties and interest, and a specific dollar amount you want reimbursed. Many reputable preparers carry errors and omissions insurance for exactly this situation, and a cooperative preparer may route the claim through their insurer with little friction.
Reread the engagement letter you signed. Some contracts cap the preparer’s liability at the amount of their fee. These clauses hold up in many situations but may not protect the preparer against claims of gross negligence or intentional misconduct.
If the preparer refuses to cooperate, small claims court handles disputes that typically range from $2,500 to $25,000 depending on your jurisdiction. For larger amounts, a tax attorney who handles professional liability cases can tell you whether a formal malpractice suit is worth filing.
Report the Preparer to the IRS
Beyond recovering your money, you can report the preparer. For any paid preparer, including those with no professional designation, the IRS takes complaints through Form 14157. You can submit it online, by fax to 855-889-7957, or by mail to the IRS Return Preparer Office.15Internal Revenue Service. Make a Complaint About a Tax Return Preparer If the misconduct directly affected your return or refund, also complete Form 14157-A, the Tax Return Preparer Fraud or Misconduct Affidavit, with supporting documentation such as copies of what the preparer gave you, payment records, and any correspondence.
If the preparer is a CPA, enrolled agent, or attorney, the IRS Office of Professional Responsibility can investigate and discipline practitioners who violate Treasury Circular 230. OPR can censure, suspend, or disbar a practitioner from representing anyone before the IRS.16Internal Revenue Service. Office of Professional Responsibility Frequently Asked Questions For a CPA, you can also file with the state board of accountancy where the CPA is licensed.
If Your Preparer Was a “Ghost”
A ghost preparer prepares your return for a fee but refuses to sign it or include their Preparer Tax Identification Number. They print the return, hand it to you, and make it look like you prepared it yourself. This is illegal and a serious red flag, because a preparer who hides their identity has little reason to get your return right.
If you discover your preparer did not sign, report them using both Form 14157 and Form 14157-A.17Internal Revenue Service. Form 14157-A, Tax Return Preparer Fraud or Misconduct Affidavit Gather everything that proves you used a paid preparer: business cards, advertisements, cancelled checks or credit card statements showing payment, emails or texts about the return, and any copies of Form 8879 if the preparer e-filed on your behalf. Mail the forms and documentation to the address on any IRS notice you received, or to the address where you would normally file Form 1040 if no notice was sent.
The harder problem with ghost preparers is that they tend to disappear when things go wrong, which makes reimbursement difficult. If you are shopping for a new preparer, confirm they have a valid PTIN and will sign the return before you hand over any documents or payment.