Both models are legitimate, and plenty of businesses start with one and move to the other. This page compares the models, not specific companies. (For specific companies, see our outsourced bookkeeping list.)
ABFI is an outsourced accounting department, so we've tried to be especially clear about when the other model is the better choice.
What each one actually does
| Online bookkeeping service | Outsourced accounting department | |
|---|---|---|
| Categorize and reconcile | Yes | Yes |
| Monthly financial statements | Yes | Yes |
| Pay bills, send invoices, chase receivables | Often not included | Usually included |
| Payroll coordination | Sometimes an add-on | Usually included at higher tiers |
| Reviewed, locked monthly close | Varies | Yes |
| Controller oversight | Rarely | Yes. See bookkeeper vs controller |
| Industry reporting (jobs, clients, channels, entities) | Limited | Yes |
| Forecasts, budgets, planning | Rarely | Available (fractional CFO) |
| CPA coordination | Hands over a file | Works with your CPA through the year |
| One accountable owner | A support team | A named manager |
| Typical pricing | Packaged, lower | Higher, based on scope |
The phrase for the second model is often "fractional accounting." Our explainer on what fractional accounting is goes deeper.
Who the online bookkeeping model fits
- Sole proprietors and small businesses with simple, repeating transactions
- No inventory, few employees, one entity
- The owner handles bills and invoices and mainly needs tidy books for year end
- Budget is the main constraint
If that's you, an online bookkeeping service is likely the right choice. See Bench alternatives, QuickBooks Live alternatives and Merritt alternatives for options.
Who the accounting department model fits
- Businesses with employees, payables and receivables to manage, inventory, jobs or several entities
- Owners making hiring, pricing or financing decisions from the numbers
- Lenders, investors or buyers asking for reliable monthly financials
- Owners tired of being the person who connects the bookkeeper, the CPA and the bank
That's ABFI's Fractional Accounting Department.
Signs you've outgrown an online bookkeeping service
- You're still paying the bills, invoicing and chasing customers yourself, and it's eating your week.
- The monthly statements arrive, but nobody explains them, and you don't trust them enough to act.
- Your CPA finds problems every year.
- You need job, client, location or channel profitability.
- A lender asked for something the service doesn't produce.
What about cost?
An accounting department costs more because it does more. Compare what you'd otherwise pay for: an in-house bookkeeper, a part-time controller, CFO help, plus your own hours coordinating them. Our guides to outsourced accounting cost and in-house vs outsourced accounting lay out the comparison. ABFI's pricing estimator shows a planning range.
Wondering where AI fits? See AI bookkeeping software vs an accounting team.
Keep reading
Sources
- ABFI Accounting, Pricing, www.abfiaccounting.com/pricing. Checked November 6, 2026.
- ABFI Accounting, How We Work, www.abfiaccounting.com/how-we-work. Checked November 6, 2026.
Questions owners ask
What's the difference between a bookkeeping service and an accounting firm?
A bookkeeping service records and reconciles transactions. An outsourced accounting department also runs payables and receivables, closes and reviews the books, adds controller oversight and planning, and coordinates with your CPA.
Is an online bookkeeping service enough for a small business?
For simple businesses, often yes. Once employees, inventory, several entities or outside stakeholders enter the picture, many businesses need more.
How much more does an outsourced accounting department cost?
More than packaged bookkeeping, because the scope is wider. Compare it with the cost of the people and time it replaces.
Can I start with an online service and switch later?
Yes. Many businesses do. Keep your books in your own accounting file so switching is easy.
Does an accounting department do taxes?
Some do. ABFI doesn't; we hand clean books to your CPA.
Not sure which model you need?
ABFI's complimentary Business Accounting Diagnostic looks at your books and tells you honestly which model fits.