A note before you read: ABFI offers both, as one accounting department with CFO-level help available, so we have a view. We've tried to explain the difference fairly enough that you could act on it with anyone.
The simplest way to see the difference
Think of the accounting firm as the people who make sure the map is accurate. The CFO is the person who uses the map to plan the route.
| Outsourced accounting firm | Fractional CFO | |
|---|---|---|
| Main question | "What happened, and is it recorded correctly?" | "What should we do next, and can we afford it?" |
| Looks | Backward and at the present | Forward |
| Typical work | Bookkeeping, payables, receivables, reconciliations, month-end close, financial statements | Cash flow forecasts, budgets, pricing, KPIs, lender and investor work, scenario plans |
| Rhythm | Every week and every month | Monthly or quarterly meetings, plus projects |
| What it needs from the other | Direction on what to track | Accurate, on-time books |
| You notice it's missing when | Statements are late, wrong or never arrive | You're surprised by cash or guessing on big decisions |
For a deeper look at the CFO side, read what is a fractional CFO and what a fractional CFO actually does all month.
What an outsourced accounting firm does
An outsourced accounting firm takes over the accounting work an in-house team would do. Depending on the firm and the plan, that usually includes:
- Bookkeeping: categorizing every transaction and keeping the ledger current
- Payables: entering bills, routing them for approval and scheduling payments
- Receivables: sending invoices, applying payments and following up on late payers
- Reconciliations: matching bank, card, loan and payment-processor accounts to statements
- Month-end close: accruals, adjustments, review and locking the period
- Reporting: a profit and loss statement, balance sheet and cash flow statement each month. See monthly financial reporting
Some firms, ours included, also include a controller who reviews the close before it's final. See fractional controller.
What a fractional CFO does
A fractional CFO is a senior finance leader you share with other companies, for a set number of hours or a monthly fee. Typical work:
- A rolling cash flow forecast, often the 13-week cash flow forecast
- Annual budget and monthly budget-vs-actual review
- Pricing and margin analysis by service, product, client or job
- KPIs and a dashboard the owner actually reads
- Bank and lender relationships, and preparing for financing or investors
- Scenario plans: hiring, opening a location, buying equipment, selling the business
What it costs and what drives the price: fractional CFO cost.
Why the order matters
A CFO's advice is only as good as the numbers under it. If revenue is recorded when cash arrives instead of when it's earned, if card charges are sitting uncategorized, or if the balance sheet hasn't been reconciled in months, a forecast built on those books will be wrong in ways nobody can see.
That's why most businesses should fix the books first, or at the same time. A good fractional CFO will tell you this on the first call, and many will refuse to forecast until the books are reconciled.
Signs you need an accounting firm first
- Statements arrive late, or you don't get them at all
- Your bank balance and your books don't match
- You're months behind, or the year-end scramble is getting worse
- You or a family member are still doing the books at night
- Your CPA keeps sending back long lists of questions
Signs you're ready to add a CFO
- The books close on time and you trust them
- You're asking "can we afford to hire?" or "should we raise prices?" and nobody can answer with numbers
- You've been surprised by a cash crunch while profitable. See profitable but no cash
- A lender or investor is asking for forecasts and a budget
- You're planning a big move: a new location, an acquisition, a sale
The longer list: signs you need a CFO.
Can you get both from one place?
Yes, and there are two common ways to set it up.
- Separate providers. An accounting firm closes the books, and an independent fractional CFO uses them. This works well when the two talk monthly and agree who owns what. The risk is gaps: each assumes the other is handling something.
- One provider for both. The same team closes the books and provides the forward-looking work. This removes the handoff and the finger-pointing. The trade-off is that you depend on one provider for the whole function, so check their depth on both sides.
ABFI works the second way: an accounting department that closes and reviews your books every month, with CFO-level depth (forecasting, budgeting and scenario support) in the Fractional Department plan. Plans are flat monthly fees, listed on our pricing page. If you'd rather keep them separate, see our list of the best fractional CFO services.
Related roles, in case you're comparing those too
Keep reading
Sources
- ABFI Accounting, Pricing, www.abfiaccounting.com/pricing. Checked November 6, 2026.
- ABFI Accounting, Your Accounting Department, www.abfiaccounting.com/your-accounting-department. Checked November 6, 2026.
Questions owners ask
What's the difference between a fractional CFO and an outsourced accountant?
An outsourced accounting firm records and closes the books. A fractional CFO uses those books to plan cash, budgets, pricing and big decisions.
Do I need a CFO if I have a bookkeeper?
Not always. If your books are accurate and you're making growth decisions without the numbers to back them, CFO help is worth adding. A bookkeeper alone usually won't build forecasts or budgets.
Should I hire a fractional CFO before cleaning up my books?
Usually not. Clean, current books come first, or at least at the same time, because a forecast built on messy books will be wrong.
Can one firm do both?
Yes. Some firms, including ABFI, close the books and provide CFO-level help as one team. Others prefer separate providers who coordinate monthly.
How much does a fractional CFO cost compared with an accounting firm?
CFO work is senior, so it's usually priced higher per hour of work. See our guide to fractional CFO cost and compare it with the accounting firm's monthly plan.
Not sure which one you need?
The Diagnostic looks at your books and tells you whether to fix the base, add CFO help, or both. Start with a complimentary Business Accounting Diagnostic.