How-To

How to Choose a US Accounting Firm: Verify First, Compare Second

Written & reviewed by Ram Singh, founder, Numerawise Solutions · Last reviewed August 27, 2026

Choosing a US accounting firm: credentials to look for, questions to ask, pricing tiers, and decision framework.

Before you compare a single price, run three checks that take about ten minutes and cost nothing. Does the person who will sign your return hold a PTIN, and will they sign it? Do they have unlimited or limited rights to represent you if the IRS comes back with questions? And do they appear where the IRS says you can verify them? Fee, responsiveness and software all matter — but they matter after those three, because those three decide what happens on the worst day of the engagement rather than the best one.

Check 1 — the PTIN, and the signature

Every paid preparer must hold a current Preparer Tax Identification Number and must sign the returns they prepare. The IRS puts it plainly: a paid preparer “is required to sign the return and include their preparer tax identification number (PTIN).” Failing to sign and failing to furnish the identifying number are two separate penalties, under IRC §6695(b) and §6695(c). For returns filed in 2026 the inflation-adjusted figure is $65 per failure for each, capped at $32,500 a year each.

A preparer who charges you but leaves the paid-preparer box blank is what the IRS calls a “ghost preparer,” and it named them again in the 2026 Dirty Dozen: a ghost preparer “prepares a return but refuses to sign it.” The return is then filed as though you prepared it yourself, which means every position on it is yours alone to defend. This is not a technicality or a paperwork quibble. It is the single clearest signal to walk away.

One belief worth correcting, because it is repeated constantly: preparers who work under supervision and never sign are not exempt from the PTIN requirement. The IRS is explicit that they still need one, whether or not they sign. If a firm tells you its junior staff do not need PTINs because a partner reviews the work, that is wrong.

Check 2 — representation rights, which is the thing nobody asks about

Preparing a return and defending it are different privileges, and only some credentials carry both. In the IRS’s words, “enrolled agents, certified public accountants, and attorneys have unlimited representation rights before the IRS,” and may represent clients “on any matters including audits, payment/collection issues, and appeals.”

Everyone else is limited, or has nothing. Participants in the voluntary Annual Filing Season Program hold limited rights: they “may only represent clients whose returns they prepared and signed, but only before revenue agents, customer service representatives, and similar IRS employees, including the Taxpayer Advocate Service.” Crucially, “they cannot represent clients regarding appeals or collection issues even if they did prepare the return.” And a preparer who holds a PTIN but does not participate in that programme has no representation rights at all — for returns filed after 31 December 2015, preparation is the only authority they have.

Translate that into the scenario that matters. An examination letter arrives two years from now. If your return was signed by a CPA, an enrolled agent or an attorney, that person can stand in front of the IRS for you, through Appeals and Collections included. If it was signed by an Annual Filing Season Program participant, they can talk to a revenue agent about that one return and nothing further. If it was signed by an uncredentialed preparer, you are on your own from the first letter. Ask which of the three you are buying before you engage — not after the letter arrives.

Check 3 — verify the answer instead of believing it

The IRS runs a public Directory of Federal Tax Return Preparers with Credentials and Select Qualifications at irs.treasury.gov/rpo/rpo.jsf, and says it “can help you find preparers in your area who currently hold professional credentials recognized by the IRS.” It lists attorneys, CPAs, enrolled agents, enrolled retirement plan agents, enrolled actuaries and Annual Filing Season Program participants, all holding active PTINs, and it is refreshed weekly. You can search by name, ZIP code or credential.

Read its limits honestly, because they cut both ways. The directory “does not list non-credentialed return preparers who are not Annual Filing Season Program (AFSP) participants,” and some eligible preparers opt out. The IRS itself notes that preparers who are not listed “may provide quality return preparation services.” So a listing is real confirmation; an absence is a question to ask, not a verdict to reach.

For the credentials themselves, go to the issuer. A CPA is licensed by a state board of accountancy, the District of Columbia or a US territory — not by the IRS — so verification runs through the state board that issued the licence. An enrolled agent is the opposite: licensed by the IRS directly, and the IRS calls it “the highest credential the IRS awards.” EA status is earned by passing a three-part IRS examination or through qualifying IRS employment, and it is maintained with 72 hours of continuing education every three years, including 6 hours of ethics, with a minimum of 16 hours in any single year. To confirm an EA is current, use the IRS Office of Enrollment contact form — the email address that older articles give for this no longer appears on the IRS page.

Where a bookkeeper stops and a preparer starts

This line confuses buyers of outsourced accounting more than any other, and the IRS draws it clearly. A bookkeeper who “gathers client receipts and invoices, and organizes and records all information” is not a tax return preparer and needs no PTIN. But once the work involves “making determinations that affect tax liability,” a PTIN is required — and that applies to business returns, not only individual ones. Forms 1065, 1120 and 1120-S do not appear on the IRS’s exemption list.

So a firm can lawfully keep your books all year without anyone holding a PTIN, and still need a credentialed person for the return. The question to ask is who does which part, and whether the person signing the return is the person who has actually seen the books. A firm that hands a stranger a trial balance in March is a different product from one where the same team carries the file all year, even where the headline fee looks similar. If you are weighing that structural question more broadly, our comparison of outsourced versus in-house accounting covers the trade-offs in detail.

The paperwork you sign says more than the proposal does

Two IRS forms tell you exactly what you have granted. Form 8821 is a Tax Information Authorization: it lets a named person or firm inspect your confidential tax information, and nothing more. The instructions are explicit that it does not authorise your designee to speak on your behalf or represent you in any other manner before the IRS. Any individual or entity can be named on it — no credential is required.

Form 2848 is a Power of Attorney, and it does authorise representation — which is why the representative must be eligible to practise before the IRS and must sign a declaration under penalties of perjury. If a firm promises to “handle any IRS issues” but only ever puts an 8821 in front of you, the promise and the paperwork do not match. Ask why before you sign, not afterwards.

What actually moves the price

Most fee differences between firms are not margin. They are scope, and the same five variables explain nearly every quote we have issued or been asked to beat:

1. monthly transaction volume;
2. the number of bank, card and loan accounts to reconcile;
3. whether payroll is in scope, and in how many states;
4. sales tax exposure and the number of jurisdictions;
5. how many months of catch-up or cleanup sit between today and a clean opening balance.

Two quotes are comparable only if those five are identical, and they usually are not. Ask each firm to state them explicitly in the proposal. For reference, our own bookkeeping engagements start at $300 a month and simple conversions at $500, fixed-price and quoted within 24 hours — the detail sits on bookkeeping, payroll and QuickBooks conversion. The number matters less than whether the firm will put the scope in writing and then hold the price.

A related question worth asking early: is the cheapest quote cheap because the work is genuinely smaller, or because the cleanup has been left out and will be billed later? If nobody has looked at your file, nobody can price it. That is why a scoping review of the actual data should come before a proposal rather than after one. If your books are the unknown in that equation, our free QuickBooks File Analyzer will tell you what shape the file is in before anyone quotes on it.

The IRS’s own red flags

You do not need a private list for this. The IRS publishes one, and it is short:

• “Avoid tax return preparers who base their fees on a percentage of the refund.”
• Preparers “who offer to deposit all or part of your refund into their financial accounts.”
• A preparer who refuses to sign or to provide a PTIN — “that is a major red flag.”
• Anyone claiming they can obtain a larger refund than other preparers can.
• Never sign a blank tax form.
• Cash-only fees with no receipt, or e-filing from a pay stub instead of a W-2.
• Consider “whether the individual or firm will be around for months or years” after filing.

Add one of our own, drawn from cleanup work rather than from the IRS: a firm that will not tell you which named person owns your file is telling you something. Staff turnover inside a firm is normal and expected; refusing to name the file owner is not.

A ten-minute checklist before you sign anything

1. Ask for the credential in plain words: CPA, enrolled agent, attorney, AFSP participant, or none.
2. Search that name in the IRS directory at irs.treasury.gov/rpo/rpo.jsf.
3. For a CPA, confirm the licence with the issuing state board; for an enrolled agent, confirm through the IRS Office of Enrollment.
4. Get written confirmation that they will sign the return and enter their PTIN.
5. Ask who prepares, who reviews, and who holds the file between January and December.
6. Get scope in writing against the five variables above — volume, accounts, payroll states, sales tax jurisdictions, catch-up months.
7. Check whether you are being asked for Form 2848 or Form 8821, and whether that matches what was promised.

Nothing on that list requires accounting knowledge, and together they eliminate most of the ways this decision goes wrong.