ACCOUNTING FIRM OR FRACTIONAL CFO. THE SCOPE IS THE DIFFERENCE.
An accounting firm produces clean books and tax returns. A fractional CFO does that plus monthly WIP, 13 week cash flow forecasting, owner advisory, and operational decisions about pricing, billing, and bonding. The accounting firm is reactive and reports last quarter's numbers, while the fractional CFO is forward looking and drives next quarter's decisions. Commercial subcontractors over $1.5M revenue almost always need the fractional CFO scope.
The reason this question comes up is that both providers hold themselves out as doing your accounting, and both are telling the truth about a different half of it. An accounting firm's deliverable is a clean P&L, a balance sheet, and a tax return, produced after the period closed. A fractional CFO's deliverable is all of that plus a monthly action list that turns the financial data into operating moves, produced while you can still change the outcome. The line usually gets crossed somewhere around $1.5M to $2M of revenue, when the business takes on bonding, multiple GC customers, prevailing wage exposure, or a line of credit that has to be watched.
WHAT EACH ONE DOES.
| Capability | Accounting Firm | Fractional CFO |
|---|---|---|
| Bookkeeping and monthly close | Yes, monthly or quarterly | Yes, monthly |
| Year end statements and tax return | Yes, that's the core of it | Clean books to the CPA, who files the return |
| Job costing aligned to the estimate | No | Yes |
| Monthly WIP schedule | Rarely, most firms don't produce one | Yes |
| 13 week cash flow forecast | No | Yes |
| Bonding and banking strategy | No | Yes |
| Input on a bid before you send it | No | Yes, through the overhead rate and margin targets |
| Monthly working session with the owner | No | Yes, ending in a written action list |
| Time direction | Backward, last quarter | Forward, next quarter |
| Cost for a $5M commercial sub | Roughly $1,200 to $1,800 a month | Priced by trailing twelve month revenue, see the pricing page |
Both columns are real work and the left one isn't optional. The question this page is answering is who owns the rows the accounting firm leaves blank, because in most companies the answer is the owner, at whatever hour is left.
WHEN THE WORK IS COMPLIANCE.
An accounting firm covers compliance work, and it covers it well. Monthly or quarterly bookkeeping, year end financial statements, tax preparation, sales tax filings, payroll tax filings, and W-2 and 1099 generation all sit inside that scope. The work is largely retrospective by design, so the firm tells you what happened, keeps your IRS reporting correct, and minimizes what you owe.
Below $1.5M and running level, the accounting firm works. A residential subcontractor under $1M with simple pay terms, no bonding, no line of credit, and a consistent customer base doesn't need a fractional CFO, because the owner can read the monthly P&L themselves and decide from it. A commercial subcontractor at $1M to $1.5M with one or two GC customers, no bonding pressure, and a simple cost structure can operate the same way, since the complexity below that band is manageable without dedicated CFO support.
For price context, a construction accounting firm for a $5M commercial sub runs roughly $1,200 to $1,800 a month. That number is worth knowing because it's the comparison most owners are running in their head, and it's a fair comparison as long as you also compare what's inside it. The rows the accounting firm leaves blank don't stop being work, they just move onto the owner's desk.
WHEN THE WORK IS COMPLIANCE PLUS OPERATIONS.
A fractional CFO firm covers everything an accounting firm does, plus operational finance. That means job costing aligned to the estimate, a monthly WIP schedule, 13 week cash flow forecasting, a monthly working session with the owner, bonding strategy, banking relationship management, owner compensation structure, and operational decisions about pricing, billing cadence, and where capital goes next.
There are four signals that tell you the accounting firm scope has been outgrown. First, you wait six months for last year's numbers, the firm closes the year, gives you a P&L in March, and you find out the company made less than you thought with nothing left to do about it. Second, the numbers don't match what you saw in the field, the P&L says a job was profitable and you watched the crew run over hours, and nobody can reconcile the difference because the cost codes don't line up with the estimate.
Third, your bank or your bonding agent is asking for documents your accounting firm can't produce, a monthly WIP schedule, a 13 week cash forecast, normalized financials. Most accounting firms don't produce those and fractional CFO firms do. Fourth, you're making operational decisions by feel, pricing a bid, deciding whether to take a job, hiring a controller, expanding bonding, and none of those get help from an accounting firm because they aren't accounting questions.
WHERE WE COME OUT.
We don't replace your CPA. Tax preparation, tax planning, and audit defense stay where they are. What we bring is clean job costed books, a monthly WIP schedule, cash flow forecasting, and CFO advisory to the owner, and the CPA receives financials at year end that are clean enough to file from without a cleanup phase first.
That's the typical engagement: we operate as the fractional CFO while your existing CPA stays in place for tax work. We rebuild the job costing structure, run monthly WIP, and produce year end financials that make the CPA's engagement materially faster. Most CPAs welcome the arrangement, because clean books mean less cleanup in January and a planning conversation with you that's about next year instead of catching up on last year. The two roles are complementary, not competitive.
Where this comes out for a commercial subcontractor is the line around $1.5M to $2M. Below it, the accounting firm scope is sufficient and paying for more is paying for capacity you won't use. Above it, the accounting firm scope leaves operational questions unanswered, and what that costs is the bid you priced off a stale overhead rate and the job you didn't catch until it closed, neither of which appears in a fee comparison.
FREQUENTLY ASKED.
