Tax return red flags and the duty to ask more questions

Every preparer knows the feeling. The client's story is plausible on paper, but something about it doesn't sit right. Maybe the numbers are too clean. Maybe the explanation changes slightly each time you ask a follow-up question. That instinct isn't a distraction from the job. It is the job.

Trust matters, but it isn’t unlimited

Preparers are generally allowed to rely in good faith on what clients tell them, and most of the time that reliance is reasonable. Clients aren't required to hand over an audit-ready file just to get a return prepared. But that trust has a ceiling. The moment information looks incorrect, incomplete or inconsistent, the standards shift from "take it at face value" to "ask more questions." Reasonable inquiry isn't optional once red flags appear, and skipping that step is where good preparers get into avoidable trouble.

Learn to spot the pattern, not just the number

Problem returns rarely walk in the door labeled as such. They show up as details that quietly don't line up. Watch for:

• A business that reports losses year after year with no obvious source of funding
• Activity that doesn't match the client's industry, margins or apparent lifestyle
• Income that seems low next to bank deposits, Forms 1099 or last year's return
• Deductions that are large, repetitive or missing the paperwork to back them up
• Ownership, basis, loans or related-party details that don't hold together
• A client explanation that contradicts something already in the file

None of these facts prove a return is wrong. What they prove is that the preparer can't stay passive and simply type in the numbers.

Ask before you agree, not after

The best time to test a shaky fact pattern is early in the engagement, not after the return is halfway built. A useful sequence looks like this:

1. Name exactly what doesn't fit.
2. Ask direct, specific follow-up questions.
3. Request the records that should exist if the client's story is accurate.
4. Compare the answer against prior filings and third-party documents.
5. Decide whether the explanation actually holds up.

If a client claims a sizable deduction, ask what generated it and what documentation supports it. If a business never seems to turn a profit, ask how it stays funded and whether a genuine profit motive exists. If deposits and lifestyle outpace reported income, ask for a reconciliation. These aren't accusations. They're the ordinary due diligence that separates a defensible return from a liability.

Know where reasonable reliance ends

There's a real difference between trusting a client in good faith and choosing not to see what's in front of you. Preparers aren't expected to audit every return that crosses their desk, but they can't wave away facts that suggest something is off. Section 6694 backs this up directly. A preparer penalty may apply when an understatement stems from an unreasonable position the preparer knew or reasonably should have known about, unless the reasonable-cause and good-faith exception applies. When the conduct crosses into willful or reckless territory, the penalty climbs sharply.

Write it down

If you decide to move forward, your file should be able to explain that decision without you in the room. Note the red flag, the questions you asked, the client's answers, the records you reviewed, any lingering uncertainty and whether disclosure came up. A few contemporaneous notes today can be the difference between a defensible position and a difficult conversation later, whether that conversation happens with the IRS, a malpractice attorney or a licensing board.

Finally, sometimes the answer is no

Not every fact pattern resolves itself with better questions. If a client stonewalls reasonable requests, can't provide enough information to support the return or pushes for aggressive reporting with no support, declining the engagement is a legitimate, professional outcome. Walking away protects the client from bad advice and protects your practice from a problem that was never yours to fix.

Trust your instincts, then back them up with process. That combination is what turns a nagging feeling into sound professional judgment.