Errors on tax returns happen — sometimes because of missing documents, sometimes because of a misunderstood rule, and occasionally because a preparer was careless or incompetent. What matters is knowing what to do when you discover a mistake, understanding who bears responsibility, and knowing when professional help is needed to fix the situation before it becomes worse.
Whose Responsibility Is a Tax Error?
The IRS holds the taxpayer — not the preparer — ultimately responsible for the accuracy of a filed return. This is stated clearly on the return itself, which carries your signature (or electronic authentication) as confirmation that the information is correct to the best of your knowledge. A preparer who makes a mistake that results in underpaid tax cannot generally be sued to cover your tax liability, though they may face other consequences.
That said, preparers are not entirely insulated. The IRS can impose preparer penalties under Sections 6694 and 6695 of the Internal Revenue Code for unreasonable positions, negligence, or willful misconduct. California has parallel preparer penalties under state law. And if a preparer committed fraud — deliberately falsifying information to generate a larger refund — criminal exposure may apply to them, not just civil penalties.
From a practical standpoint, understanding that you bear primary liability makes it urgent to fix errors promptly. Waiting does not reduce penalties; it compounds them.
Common Types of Tax Preparer Errors
Mathematical and Transcription Errors
These are usually simple mistakes — transposing numbers, entering a figure from the wrong box on a 1099, or miscalculating a carry-forward amount. The IRS often catches mathematical errors during processing and corrects them automatically, sending you a notice explaining the change. These are typically the least serious type of error.
Missing Income
If a preparer omitted income — perhaps because a 1099 arrived after the return was filed — the IRS will eventually match what payers reported to what your return showed and send a notice. This is a legitimate situation for an amended return and is generally not treated as fraud unless there was a pattern of concealment.
Incorrect Filing Status
Filing as single when you qualify as head of household, or filing jointly when married filing separately would have been more beneficial, can produce a significantly different tax result. Some of these errors are reversible through amendment; others may have time limits.
Missed or Overstated Deductions and Credits
A preparer who claimed deductions you did not qualify for — a home office you did not use regularly and exclusively for business, charitable deductions without adequate documentation, or a dependent you were not entitled to claim — creates a liability that the IRS may eventually challenge. Conversely, a preparer who missed deductions you were entitled to left money on the table that may be recoverable through amendment.
Wrong Bank Account for Direct Deposit
A transposed routing or account number on a direct deposit instruction can redirect a refund to the wrong account. This is recoverable through the IRS, but the process can take weeks or months.
What to Do When You Find an Error
Step 1: Contact the Preparer First
The first step is to contact the preparer who prepared the return and explain the error clearly. Reputable preparers will acknowledge mistakes and either prepare an amended return at no additional charge or at a reduced fee, depending on the circumstances. Document this communication in writing — an email or letter is preferable to a phone call that leaves no record.
Step 2: Assess the Error’s Impact
Not every error produces a tax liability. If the preparer understated a deduction, the government owes you money, not the other way around. Amended returns to claim additional refunds are generally allowed within three years of the original filing deadline.
If the error produced an underpayment of tax, you will owe the tax plus interest (which accrues from the original due date) and potentially a penalty. Fixing the error quickly reduces the amount of interest that accumulates.
Step 3: File an Amended Return
Federal amended returns are filed on Form 1040-X. California amended returns use Form 540X for most individual filers. An amended return replaces the incorrect return for the affected items and either claims a refund or pays the corrected amount owed.
If the preparer refuses to help or is unreachable, you may need to hire a different professional — preferably a CPA or enrolled agent — to prepare the amendment and correct the original work.
Step 4: Respond to Any IRS or FTB Notices
If the error triggered a notice from the IRS or California FTB before you discovered it, respond within the deadline stated on the notice. Never ignore a tax notice. If the notice relates to an error your preparer made, bring it to their attention and ask for their assistance in responding. If you have lost confidence in the preparer, engage a new one for the response.
When to Consider Reporting the Preparer
Not every error warrants reporting a preparer, but some behaviors go beyond honest mistakes:
- A preparer who inflated deductions without your knowledge or approval
- A preparer who claimed credits you clearly did not qualify for
- A preparer who refused to give you a copy of your return
- A preparer who directed your refund to their own account
- A preparer who signed a blank return and had you fill it in later
- A preparer who promised a specific refund amount before reviewing any documents
These behaviors can be reported to the IRS through Form 14157 (Complaint: Tax Return Preparer) and to the California Franchise Tax Board for state return issues. For licensed professionals — CPAs and attorneys — complaints can go to the California Board of Accountancy and the State Bar, respectively. For enrolled agents, complaints go to the IRS Office of Professional Responsibility. For CTEC-registered preparers, the California Tax Education Council has a complaint process as well.
Protecting Yourself Going Forward
After dealing with a preparer error, it makes sense to be more selective about future choices. Beyond checking credentials and PTIN status, ask prospective preparers how they handle errors — a preparer who cannot explain their error-correction policy clearly may not have one. Consider asking whether they carry errors and omissions (E&O) insurance, which covers the cost of correcting mistakes in some circumstances, though it does not transfer your liability to the insurer.
When you switch preparers, the new preparer should review prior-year returns for any issues before preparing the current year’s return. Carry-forward items, missed deductions, and filing status questions all become visible at this stage.
Frequently Asked Questions
Am I personally liable for tax my preparer underpaid on my behalf?
Yes. The IRS holds the taxpayer responsible for taxes owed on a filed return, regardless of who prepared it. If your preparer made an error that led to underpaid tax, you owe the tax, interest, and potentially penalties. You may have a civil claim against the preparer in some circumstances, but this does not eliminate your obligation to the government.
How long do I have to file an amended return?
To claim a refund, 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). There is no statutory deadline for filing an amended return that results in additional tax owed, but interest and potential penalties accrue from the original due date, so acting quickly is in your interest.
What if I signed a return I didn’t review?
Your signature on a tax return is legally your attestation that the information is correct. Signing without reviewing creates risk. Going forward, review every line of a return before signing — a qualified preparer should walk you through the return or at minimum be available to answer questions about it. If you signed something that turned out to contain fabricated or inflated items, you may need to demonstrate that you had no knowledge of the false information to avoid fraud liability.
Can my preparer be held responsible if they filed a return with an error?
The IRS can impose penalties on preparers for negligence, unreasonable tax positions, or willful misconduct under Sections 6694 and 6695. However, preparer penalties do not reduce or eliminate what you owe. Your recourse against the preparer is primarily civil — either through the preparer’s errors and omissions insurer or through legal action — not through the IRS.
Should I work with the same preparer to fix their mistake?
If the error was a good-faith mistake and the preparer acknowledges it and offers to correct it at no cost, working with them again is reasonable. If the error appears to have been negligent or deliberate, or if the preparer is unresponsive or dismissive, finding a different qualified professional to handle the amendment is the safer choice.