Buying a bookkeeping business: what to check in the numbers
Short answer
A bookkeeping business is mostly a list of monthly recurring clients. Check each one: monthly fee, what's included, how long they've been a client, hours spent versus fee (some clients are unprofitable), who does the work, and whether the client agreement can be assigned. Verify fees against bank deposits and the business's tax returns.
Then plan the handover: access to each client's accounting software, payroll and bank feeds has to move to you without disruption.
Bookkeeping practices are one of the more accessible businesses to buy: recurring monthly revenue, low overhead, no inventory. They're also easy to overestimate, because a client list doesn't tell you how much work each client really takes.
Client-level analysis
Illustrative example, not a real business
Two clients each pay $600 a month. Client A takes about 5 hours a month; Client B takes about 18. If you pay a bookkeeper $35 an hour, Client A costs $175 in labor and leaves $425; Client B costs $630 and loses $30 a month before any overhead. The client list looks the same; the economics don't.
Recurring revenue, one client at a time
A bookkeeping firm's revenue line is the sum of many small monthly fees, which is good news for verification: you can rebuild it from the bottom. Ask for a client schedule with each client's monthly fee, start date and services (bookkeeping only, payroll, sales tax filings, catch-up work), then multiply it out and compare with the P&L and bank deposits. The schedule should also show clients lost in the last 24 months. Annual churn is the single most useful number you'll get, and most sellers have never calculated it.
| Revenue type | Quality | What to check |
|---|---|---|
| Monthly bookkeeping retainers | Solid if documented | Engagement letters, fee history, tenure |
| Payroll processing | Solid, sticky | Who owns the payroll software account |
| Catch-up and cleanup projects | Shaky: one-off | Remove from recurring; ask how many per year |
| Year-end and tax-season extras | Shaky: seasonal | Who does tax work, and are they licensed to? |
What to check
- Client list: monthly fee, services, start date, cancellation history.
- Fees invoiced vs collected; deposits in the bank match.
- Hours by client (time tracking, or staff estimates).
- Who serves each client; staff vs contractors; any non-solicit agreements.
- Client agreements: scope, price increases, assignability.
- Software: who owns each subscription and admin access.
- Data security: how client credentials and files are stored.
- Errors and omissions insurance and any claims.
Add-back traps
- The owner does the hardest clients. SDE includes the owner's time; if you won't do that work, price in a bookkeeper.
- Year-end cleanup projects presented as recurring revenue.
- Contractors who own the relationship. If they leave, so may the client.
The handover
Bookkeeping clients care about continuity: their payroll must run and their books must close. Plan for the seller to introduce you, move software access client by client, and stay available through at least one month-end and, ideally, one year-end. For larger practices with tax and attest work, see buying an accounting practice.
Data security and client consent
A bookkeeping firm holds bank logins, payroll data and tax documents for every client. Ask how credentials are stored, who has access, and whether there has ever been a breach. If the firm prepares tax returns, the FTC's Safeguards Rule (16 CFR Part 314) applies and requires a written information security program; ask your attorney whether the rest of the practice is covered. Engagement letters may restrict assignment or require client consent before their files move to a new owner, so read a sample before you count on every client transferring.
Worked example: what the client list is really worth to you in earnings
Illustrative example, not a real practice
The seller's schedule shows 60 clients averaging $500 a month: 60 × $500 × 12 = $360,000 of annual recurring fees. The P&L shows $395,000, the extra $35,000 coming from cleanup projects. Costs are two contract bookkeepers at $95,000 combined, software at $14,000 and other overhead at $21,000, so profit is $395,000 − $130,000 = $265,000 before the owner's pay. The owner works full time on clients. If you hired a senior bookkeeper for $70,000 to do that work, earnings fall to $195,000. Remove the one-off cleanup revenue (and say it carried little extra cost) and the recurring picture is closer to $160,000. Last, the schedule shows 9 clients lost last year: 9 ÷ 60 = 15% churn, which you'll need to replace to stand still.
What an SBA lender will check
Lenders will want tax returns matched to IRS transcripts, the client schedule, and evidence that revenue doesn't depend on a handful of clients. They'll ask whether the seller stays to transition clients; under SBA rules the seller can consult for up to 24 months but can't stay as an employee or officer after a full change of ownership. Because SBA deals can't include seller earnouts, protection against client loss usually comes from how the price, seller note or holdback is set. See seller transition period and seller financing.
What moves the value of a bookkeeping practice
We don't put numbers on deals or publish multiples we can't verify. These are the features that push a practice up or down within whatever range a valuation professional finds:
| Factor | Supports a higher value | Pulls it lower |
|---|---|---|
| Revenue type | Monthly retainers and payroll | Cleanup projects and tax-season extras |
| Client tenure | Clients of many years, low churn | Recent clients, high turnover |
| Client profitability | Fees match hours; regular price increases | Underpriced clients that eat staff time |
| Who does the work | Staff who'll stay | Seller serves every client personally |
| Concentration | Many small clients | A few large clients |
| Systems | Documented processes, cloud software in the firm's name | Knowledge in the seller's head |
Red flags specific to bookkeeping firms
- Clients who are the seller's friends or family. They may leave when the seller does.
- Catch-up work counted as recurring. Large cleanups for new clients make one year look better than the next.
- Behind on work. Ask how many clients' books are not reconciled through last month. A backlog is unpaid work you'll inherit.
- Tax returns prepared without the right credentials. If the firm signs returns, check the preparer's credentials and any IRS preparer penalties.
- Credentials shared by email or spreadsheet. A breach of client bank logins is the kind of liability that ends small firms.
The first 90 days after you buy
Bookkeeping clients judge a new owner by the first month-end close. Keep the same staff on the same clients, send joint introduction letters with the seller, and get every software subscription and admin login moved before the first close. Hold any price increases until you've seen a full cycle of work for each client and know who's underpriced. Then reprice the worst-paying clients one at a time, with an explanation, and accept that some will leave; that's often the right result.
Questions to ask the seller
- Which clients have you personally served for years, and how will they react to a new owner?
- How many clients did you lose last year, and why?
- When did you last raise fees, and what happened?
- Do any staff or contractors have non-solicit agreements?
- Has a client ever claimed an error cost them money?
- Which software subscriptions are in the firm's name versus the client's?
Frequently asked questions
Do I need to be a CPA to buy a bookkeeping business?
Generally no, because bookkeeping isn't attest work. But don't present the firm as a CPA firm or offer services that require a licence in your state.
How do I check client profitability?
Compare each client's monthly fee with the hours spent (from time tracking or staff estimates). Clients who consume far more time than they pay for drag down margins and may need repricing, which can trigger churn.
Are bookkeepers employees or contractors?
Many small firms use contractors. Check classification against IRS guidance; misclassification is a liability, and contractors can take clients with them.
What about software subscriptions?
Find out whether client software subscriptions are billed to the firm or the client, and who is the account owner. You need admin access transferred cleanly.
How should a bookkeeping practice purchase be structured?
Often as an asset purchase of the client list and goodwill, with part of the price tied to client retention after closing. If you use SBA financing, note that seller earnouts are prohibited in SBA change-of-ownership deals, so retention protection usually comes through a seller note, holdback or price set after a retention review. Ask your attorney and lender before you write the LOI.
What should I look for in bookkeeping engagement letters?
Scope of services, monthly fee and how it can change, the notice period for ending the engagement, who owns the client's files and data, limitation of liability, and whether the agreement can be assigned to a new owner. If letters are missing or informal, client retention after the sale depends almost entirely on the handover.
Sources
- IRS: Independent contractor (self-employed) or employee?
- FTC Safeguards Rule, 16 CFR Part 314
- IRS: Get transcript
- SBA SOP 50 10 8.1 (change of ownership rules)
Related guides
General information, not legal, tax, financial or investment advice. Rules and lender practices change; check the linked sources and talk to your attorney, CPA and lender about your deal. Examples with named numbers are illustrations, not real businesses. OKtoBuy's Deal Check does not value businesses or give price opinions.