The first question to ask any prospective tax preparer is whether they have experience specifically with your type of entity and industry. A preparer who does mostly individual W-2 returns and occasionally takes on a small business is a fundamentally different level of service from one who works primarily with LLCs, S-Corps, and small businesses day-to-day. Ask directly: how many returns of this type do you prepare each year?
Ask what happens if they make an error that results in a penalty. The answer tells you a great deal about how they stand behind their work. A preparer who says "we would help you through the process" is saying something meaningfully different from one who says "if an error on our part causes a penalty, we cover it." The latter is a written accuracy guarantee.
The Difference an Accuracy Guarantee Actually Makes
Consider a small business owner whose previous tax preparer made an error miscalculating estimated quarterly payments, resulting in an underpayment penalty of just over $1,100 when the return was ultimately filed. The preparer's response was to explain the mistake and suggest the owner request penalty abatement directly from the IRS themselves, offering no compensation or further assistance beyond that suggestion, since nothing in their engagement letter addressed preparer errors specifically.
Switching to a firm offering a written accuracy guarantee the following year, this same owner experiences a different, smaller calculation error on an estimated payment. This time, the firm covers the resulting penalty directly, as spelled out in their engagement agreement from the start, and handles the IRS correspondence on the owner's behalf without any additional cost. The service itself wasn't necessarily better in either case, mistakes happen even at good firms, but the difference in what happened after the mistake was significant, and it's a difference worth asking about before signing with any preparer, not after an error has already occurred.
Find out who will actually be working on your return. Many tax firms have a senior advisor who closes the sale and a junior staff member who does the actual work. If your engagement is going to be handed off, you should know that upfront, and you should be able to talk directly to the person doing the work when questions arise.
Understand the pricing structure before signing anything. Hourly billing with an open-ended scope is a common source of sticker shock, an engagement that was described as "a few hundred dollars" can balloon when the preparer bills for every email and question. Flat-rate pricing tied to a defined scope of work eliminates that uncertainty.
Ask how they handle communication during the year, not just at tax time. A bookkeeper or tax preparer who is only reachable in January through April is not providing advisory value, they are providing a filing service. A real advisor helps you make decisions, payroll, owner compensation structure, equipment purchases, retirement contributions, when those decisions can still affect your tax bill, not after the year closes.
Finally, ask for references or reviews from clients with similar businesses. A preparer's reviews give you direct insight into what the client experience actually looks like, turnaround time, communication quality, and whether the relationship lasts beyond year one.
PTIN, EA, CPA: What Each Credential Actually Means
Anyone paid to prepare federal tax returns must hold a PTIN, but that alone doesn't indicate a specific level of training. An Enrolled Agent (EA) has passed a comprehensive IRS exam and can represent clients before the IRS in any matter. A CPA is licensed at the state level, often with a broader accounting and audit background, and can also represent clients before the IRS. Neither credential is automatically "better" than the other for tax preparation specifically, both are qualified, but each brings a different professional background worth understanding when evaluating who you're working with.
Asking directly what credentials a preparer holds, and what that credential actually qualifies them to do (particularly around IRS representation if you're ever audited), is a reasonable and increasingly common question, not an awkward one.
It's also reasonable to ask for a sample of the actual deliverables you'd receive, a sample financial statement package or a redacted example return, before committing. This gives you a concrete sense of the quality and clarity you can expect, rather than relying entirely on a sales conversation to judge the fit.