Most founders choose an accounting firm the way they choose a plumber: get a referral, compare a couple of quotes, pick one. The problem is that accounting is not a one-time repair. You are hiring the function that produces every number you will use to make decisions, raise money, and file taxes. Choose badly and you find out months later, usually during a fundraise or an audit, when the books turn out to be a mess and switching costs you a quarter.
Here is how to vet a firm properly, and the questions that surface the difference between a real finance partner and a service that just categorizes transactions.
1. Nail down the scope in writing
"We do your accounting" can mean anything from monthly bookkeeping to a full controller-and-CFO stack. Before you compare price, compare scope. Ask exactly what is included: transaction categorization, bank and credit card reconciliation, the monthly close, accruals and deferrals, financial statements, payroll and AP support, cash reporting, and any advisory. A cheap quote that only covers categorization is not cheaper, it is smaller.
2. Ask who actually does the work
This is the question that reveals the most. In many firms, a senior partner sells the engagement and an offshore junior does the books with little review. That is fine for simple categorization and a problem the moment your situation gets complicated. Ask who touches your books day to day, who reviews their work, and who you call when something looks wrong. The right structure is usually a bookkeeper on the mechanics, a controller reviewing the close, and senior eyes available when a real question comes up.
3. Get a specific close timeline
A good firm closes your books within a predictable window every month, commonly five to ten business days after month-end, and tells you that number up front. If the answer is vague ("it depends," "a few weeks"), that is a sign the close is not a disciplined process. Late books are not just annoying. They mean you are steering the business on data that is weeks stale.
4. Check the systems and integrations
Ask what accounting platform they standardize on, how they handle your bank feeds, and how your other tools connect: payroll, expense cards, billing, e-commerce, or point of sale. A firm that insists on manual entry when clean integrations exist will be slower and more error-prone, and will bill you for the extra hours. You also want to confirm you own your data and can export it cleanly if you ever leave.
5. Understand the pricing model
Hourly billing quietly punishes you for asking questions and gives the firm an incentive to spend more hours. A fixed monthly fee for a written scope aligns everyone: you know your number, and a quick question costs you nothing. Whatever the model, make sure you understand what triggers extra charges, because "out of scope" surprises are where relationships sour.
6. Confirm they know your kind of business
Revenue recognition for a SaaS company, inventory and COGS for e-commerce, and job costing for a services firm are genuinely different disciplines. A firm that has never handled deferred revenue should not be your first SaaS bookkeeper. Ask for examples of businesses like yours and how they handled the tricky parts.
The red flags
- Vague scope. If they cannot tell you exactly what is included, the gaps become your problem.
- No named close timeline. A firm without a close cadence does not have a real process.
- You cannot reach anyone senior. When a hard question comes up, you need judgment, not a ticket queue.
- They discourage questions. Your accountant should make you more confident about the numbers, not less.
- They own your data. You should always be able to export clean books and leave.
The real test
The best question to end on is simple: "If I asked you why gross margin moved last month, could you tell me?" A data-entry service will point you back to the statements. A real finance partner will already know, because they closed the books with their brain engaged, not just their fingers. That difference is the whole point of outsourcing to begin with.
If you want a partner who works on a fixed monthly fee, closes on a set timeline, and can actually explain your numbers, that is exactly how our accounting and controller services are built.