How can I verify a CPA's license?

Every state has a public CPA license lookup database maintained by the State Board of Accountancy. In most states, you can search by name and verify that the license is active, see the expiration date, and check for any disciplinary actions. The NASBA CPA Verify tool at cpverify.org aggregates most state records into a single search.

What should I do if my CPA made an error on my tax return?

First, document the error in writing. Contact the CPA firm and request a corrected return and payment of any penalties or interest caused by the mistake. If they refuse, you can file a complaint with your State Board of Accountancy. In cases of negligence causing significant financial harm, you may have grounds for a civil claim. The IRS also has a Return Preparer Complaint form (Form 14157).

Is it a red flag if my CPA guarantees a refund?

Yes — absolutely. No legitimate CPA can guarantee a specific refund before reviewing all of your documents. Anyone who promises a large refund upfront is likely inflating deductions or fabricating credits, which exposes you to IRS penalties and potential fraud charges — not just the preparer.

My CPA wants me to sign a blank return. Is that normal?

No. Never sign a blank or incomplete tax return. You are legally responsible for everything filed under your Social Security number, regardless of who prepared it. A preparer who asks you to sign blank forms is a serious red flag and may be engaged in fraud.

How do I find a trustworthy CPA if I've had bad experiences?

Look for CPAs with active state licenses in good standing, verifiable credentials (CPA designation, ideally with specializations like ABV or PFS), client reviews that mention specific outcomes rather than generic praise, and clear, written engagement letters. Personal referrals from other business owners in your industry are often the most reliable path to a good fit.

CPA Red Flags: 10 Signs of a Bad Accountant to Avoid in 2026

April 25, 2026

Why Choosing the Wrong CPA Is Expensive

A bad accountant doesn't just cost you their fee — they can expose you to IRS penalties, missed deductions, and in serious cases, federal tax fraud charges. The IRS processed over 150,000 Return Preparer Complaints in the last five years. Many of those complaints originated from clients who ignored early warning signs.

Here are the ten most common red flags, and what each one actually means for your finances.

Red Flag #1: They Promise a Large Refund Before Reviewing Your Documents

Any CPA or tax preparer who quotes you a refund amount before analyzing your income, deductions, and credits is either guessing or planning to inflate your return. A legitimate CPA cannot know your refund until they've reviewed your W-2s, 1099s, expense records, and prior-year return. If you're being recruited with promises of a big refund, walk away.

Red Flag #2: They Don't Ask Many Questions

A thorough CPA asks a lot of questions — about life changes, new income streams, major purchases, travel for business, home office use, and more. A preparer who takes your W-2, plugs in numbers, and hands you a return in 20 minutes isn't doing tax planning — they're doing data entry. You're likely leaving deductions on the table.

Red Flag #3: Their Fee Is Based on Your Refund

The IRS explicitly prohibits tax preparers who are attorneys, CPAs, or enrolled agents from basing fees on the size of a refund. Any preparer who charges a percentage of your refund has a financial incentive to inflate your return — which puts you at risk, not them. Legitimate fees are flat-rate or hourly.

Red Flag #4: They Can't Be Reached After April 15

Tax planning is a year-round activity. If your CPA is impossible to reach between May and January, you're not getting the proactive advice that actually saves money. Q3 and Q4 are when smart tax moves happen — Roth conversions, retirement contributions, equipment purchases, year-end income acceleration or deferral. A CPA who disappears during those months is a compliance-only service.

Red Flag #5: They Ask You to Sign a Blank or Incomplete Return

Never sign a tax return that doesn't have all fields completed. You are legally responsible for every number on your return, regardless of who filled it in. A preparer who asks for your signature before the return is complete is either cutting corners or creating room to alter the return after you've signed — both are serious problems.

Red Flag #6: They Suggest Deductions You Know You Don't Qualify For

Some unscrupulous preparers inflate deductions to increase your refund — and their referral value. Charitable donations you didn't make, home office deductions on a space that doesn't qualify, vehicle expenses without a mileage log: these look good on paper until the IRS requests documentation. The client is always liable for accuracy, even when a preparer committed the error. IRS penalties for negligent underpayment start at 20% of the underpayment; fraud penalties reach 75%.

Red Flag #7: Their PTIN Is Expired or Missing

Every paid tax preparer must have a current Preparer Tax Identification Number (PTIN) issued by the IRS and must include it on every return they prepare. You can verify PTINs at the IRS Return Preparer Directory (irs.gov/taxpros). A CPA who can't provide their PTIN or whose PTIN is expired cannot legally prepare your return for compensation.

Red Flag #8: They Have No Written Engagement Letter

A professional CPA firm sends a written engagement letter before work begins. It specifies what services are included, what's excluded, what information you need to provide, the fee structure, and the timeline. A CPA who works without a written agreement leaves both parties exposed to misunderstandings — and you with no recourse if work isn't delivered as expected.

Red Flag #9: They Don't Communicate Proactively About Tax Law Changes

Tax law changes constantly. The 2026 filing season includes the first year of post-TCJA provisions that reverted, updated contribution limits, and modified standard deduction amounts. A CPA who doesn't reach out when changes affect your situation is not providing full-service advisory — they're just filing returns. Find a tax planning CPA who treats the relationship as ongoing, not annual.

Red Flag #10: You Can't Verify Their CPA License

Not everyone who calls themselves an accountant is a licensed CPA. The CPA designation requires passing the Uniform CPA Exam (one of the hardest professional licensing exams in the country), meeting state-specific education and experience requirements, and maintaining CPE (continuing professional education) credits annually. You can verify any CPA's license through your State Board of Accountancy or at cpverify.org. If someone's credentials can't be verified, treat them as unlicensed.

What to Do If You've Already Had a Bad Experience

If your previous CPA made errors, file amended returns (Form 1040-X) for any open tax years within the statute of limitations — generally three years from the original filing date, six years if there was a substantial understatement. Report dishonest preparers to the IRS using Form 14157 and to your State Board of Accountancy.

Then start over with a properly vetted CPA. Search for CPAs near you with verified credentials and client reviews. If you were in a major metro, browse verified firms in Houston, Denver, or Seattle to find a qualified replacement.

Frequently Asked Questions

How can I verify a CPA's license?: Every state has a public CPA license lookup database maintained by the State Board of Accountancy. In most states, you can search by name and verify that the license is active, see the expiration date, and check for any disciplinary actions. The NASBA CPA Verify tool at cpverify.org aggregates most state records into a single search.
What should I do if my CPA made an error on my tax return?: First, document the error in writing. Contact the CPA firm and request a corrected return and payment of any penalties or interest caused by the mistake. If they refuse, you can file a complaint with your State Board of Accountancy. In cases of negligence causing significant financial harm, you may have grounds for a civil claim. The IRS also has a Return Preparer Complaint form (Form 14157).
Is it a red flag if my CPA guarantees a refund?: Yes — absolutely. No legitimate CPA can guarantee a specific refund before reviewing all of your documents. Anyone who promises a large refund upfront is likely inflating deductions or fabricating credits, which exposes you to IRS penalties and potential fraud charges — not just the preparer.
My CPA wants me to sign a blank return. Is that normal?: No. Never sign a blank or incomplete tax return. You are legally responsible for everything filed under your Social Security number, regardless of who prepared it. A preparer who asks you to sign blank forms is a serious red flag and may be engaged in fraud.
How do I find a trustworthy CPA if I've had bad experiences?: Look for CPAs with active state licenses in good standing, verifiable credentials (CPA designation, ideally with specializations like ABV or PFS), client reviews that mention specific outcomes rather than generic praise, and clear, written engagement letters. Personal referrals from other business owners in your industry are often the most reliable path to a good fit.