Bookkeeper, Controller or Fractional CFO? Outsourced Accounting for Startups

A startup before seed needs a bookkeeper and a tax preparer. A funded seed company needs bookkeeping with monthly controller review. A company raising or holding a Series A needs that plus part-time CFO and FP&A support. Most companies hire their first full-time finance person between Series A and Series B. Everything before that point is usually cheaper and better done by an outsourced team.

The mistake we see most often runs in both directions. Some founders hire a full-time CFO at seed, who then spends two years doing controller work at CFO pay. Others run a $4M ARR company on a bookkeeper alone and find out during Series A diligence that deferred revenue was never recorded. The table below is the default we start from. Treat the stage, ARR and headcount bands as typical patterns, not rules.

Each finance role answers a different question. The bookkeeper answers "what happened," the controller answers "is it right," FP&A answers "what happens next" and the CFO answers "what should we do about it." The staff accountant sits between bookkeeper and controller and does the adjusting work.

• Bookkeeper. Categorizes bank, card and payment-processor activity, enters bills, issues invoices, matches receipts and reconciles cash accounts. Works from rules and does not decide accounting treatment.
• Staff or senior accountant. Books accruals, prepaid amortization, deferred revenue, fixed assets and depreciation, payroll journal entries and balance sheet reconciliations. This is the person who turns cash-basis records into accrual books.
• Controller. Owns the close calendar and signs off on the financial statements. Decides accounting policy (ASC 606 revenue recognition, ASC 718 stock compensation, capitalization thresholds), designs controls such as approval limits and segregation of duties, keeps the compliance calendar (sales tax, 1099s, Delaware franchise tax, state filings) and gets the company ready for its first audit.
• FP&A. Builds the budget and the driver-based operating model, runs budget-versus-actual analysis, maintains the headcount plan and produces SaaS metrics such as ARR, net revenue retention, gross margin, CAC payback and burn multiple.
• CFO. Owns runway and cash strategy, fundraising and the data room, the finance section of the board deck, banking and debt relationships, pricing decisions and, eventually, the finance team itself.

One decision rule follows from this list. If you cannot name the person who signs off on your monthly financials, you do not have a controller function, no matter who else you have hired. A fractional CFO who also does the controller review is fine at seed, as long as the engagement letter says so explicitly.

The most reliable trigger for adding a finance role is an event, not a revenue number: a priced round, a first audit, a debt facility, a second legal entity or a revenue model your current team cannot account for. Revenue and headcount bands are useful as a cross-check.

Add controller review (if you only have a bookkeeper) when any of these is true:

• You have closed a priced round or raised more than about $1M on SAFEs, so investors will expect accrual-basis, GAAP-style financials.
• You sell annual or multi-year contracts and need a deferred revenue schedule.
• You have employees on payroll in two or more states, or a foreign subsidiary.
• You issued stock options and need ASC 718 expense booked.
• You are past roughly 300 transactions a month across bank, card and processor accounts.

Add part-time CFO or FP&A support when any of these is true:

• You plan to raise a priced round in the next 6-9 months. Start the CFO about three months before you open the round so the model and metrics are built from closed books.
• Runway is under 12 months and you need a plan that the board will accept.
• You are negotiating venture debt, a bank line with covenants or a large customer contract with unusual payment terms.
• Your board asks for a monthly or quarterly finance package and nobody owns it.

Plan a full-time finance hire when two or more of these are true: headcount above roughly 60-75, ARR above roughly $5M, an annual audit required by investors or a lender, more than one entity to consolidate, or a fractional CFO engagement that has grown to more than about 8-10 days a month. None of these thresholds comes from regulation. They are the points where we see outsourced teams start to cost more than they save.

Outsourced finance fees are not published by any government source, so the outsourced ranges below are typical market ranges from published provider pricing and our own market observations as of October 2026. They move with transaction volume, number of entities and revenue complexity. The in-house column uses Bureau of Labor Statistics median pay for May 2025, from the Occupational Outlook Handbook.

The 0.70 divisor comes from the BLS Employer Costs for Employee Compensation release: in June 2026, wages were 70.0% and benefits 30.0% of private-industry compensation. That benefits figure already includes legally required items. For a $83,680 accountant, employer Social Security and Medicare alone is 7.65%, or $6,401.52, because the salary is under the 2026 Social Security wage base of $184,500. Federal unemployment tax adds $42 per employee (0.6% net on the first $7,000) if you get full state credit.

Two caveats. BLS medians cover all employers nationwide, and startup controllers in San Francisco or New York often cost more. And the fully loaded figure leaves out recruiting fees, software seats, equity and the cost of a vacancy when your only accountant leaves.

Outsourcing is usually cheaper until the work fills several full-time seats. Here is the arithmetic for a hypothetical company, not a client.

The company is a Series A SaaS business with 30 employees, $3M ARR on annual contracts billed upfront, one US entity, payroll in four states and quarterly board meetings. It needs a monthly close with deferred revenue, a controller who signs off, FP&A and CFO-level fundraising support for a Series B in about 18 months.

Option 1: build in-house. A controller at the professional-services median of $174,170 costs $248,814 fully loaded ($174,170 / 0.70). A staff accountant at $83,680 costs $119,543. An FP&A analyst at $103,570 costs $147,957. Total: $248,814 + $119,543 + $147,957 = $516,314 a year. That team still has no one with fundraising experience leading the Series B, so most companies would add a fractional CFO on top.

Option 2: outsource. An accounting package with bookkeeping, close and controller review at $5,000 a month is $60,000 a year. A fractional CFO at $8,000 a month, covering FP&A and board reporting, is $96,000. Total: $156,000 a year, a difference of $516,314 - $156,000 = $360,314.

Option 3: hybrid. One in-house staff accountant ($119,543), outsourced controller review at $1,500 a month ($18,000) and the same fractional CFO ($96,000). Total: $233,543. This makes sense when you have a lot of transactions or want someone on site, but it costs $77,543 more than Option 2 for roughly the same output.

The decision rule we use: when the outsourced fee for one role passes about 60-70% of the fully loaded cost of hiring that role, get quotes for the hire. In this example the accounting package ($60,000) is 50% of one loaded staff accountant ($119,543), and the CFO fee ($96,000) is about 39% of a loaded controller-level hire ($248,814), so outsourcing wins easily at this stage.

Every role should hand you something specific each month, by a specific business day. If a provider cannot list its deliverables this way, you are paying for hours, not outputs.

Bookkeeper, by business day 5:

• All bank, card, payroll and payment-processor accounts reconciled to statements
• Uncategorized transactions cleared or listed with questions
• AP aging and AR aging reports
• Receipts matched for card spend above your policy threshold

Staff accountant, by business day 8:

• Accrual entries for unbilled vendor costs and payroll
• Prepaid and deferred revenue schedules rolled forward
• Fixed asset and depreciation schedule
• Balance sheet reconciliation for every account with a balance

Controller, by business day 10-15:

• Signed-off income statement, balance sheet and cash flow statement on an accrual basis
• Flux analysis explaining material month-over-month changes
• Close checklist with every task marked complete or carried forward
• Compliance calendar for the next 60 days (sales tax returns, payroll filings, 1099s, franchise tax)

FP&A, by business day 15:

• Budget-versus-actual report with explanations
• Updated rolling forecast and headcount plan
• SaaS metrics pack: ARR bridge, net revenue retention, gross margin, CAC payback and burn multiple
• 13-week cash forecast, updated weekly if runway is under 12 months

CFO, monthly and quarterly:

1. A one-page monthly investor or founder update covering cash, burn, runway and key metrics.
2. The finance section of the board deck, with scenarios.
3. A treasury review covering where cash sits, and how much of it is above the FDIC standard insurance amount of $250,000 at any one bank.
4. A fundraising readiness checklist and data room status when a round is within six months.

For more detail on what investors expect in the package, see our post on investor-ready financial packages.

A startup finance stack has five layers, and each one should have a named owner on the finance team. The tools matter less than whether they are connected, so that transactions flow into the general ledger without manual re-entry.

• General ledger. QuickBooks Online or Xero for most companies through Series B; an ERP such as NetSuite when you have multiple entities, complex revenue or audit-driven requirements. Owner: controller.
• Spend and AP. Corporate cards and bill-pay tools such as Ramp, Brex or BILL, with approval workflows set to your approval matrix. Owner: bookkeeper, with controller-defined rules.
• Payroll and HR. A payroll provider such as Rippling or Gusto that posts a journal entry to the ledger each pay run. Owner: operations or people team, reviewed by the staff accountant.
• Billing and revenue. Stripe Billing or a subscription billing tool, plus a revenue recognition schedule (Stripe offers revenue recognition as a paid add-on) or a spreadsheet maintained by the accountant. Owner: controller.
• Planning and reporting. A spreadsheet model at seed; a dedicated FP&A tool once the model has many departments and scenarios. Owner: FP&A or CFO.

What goes wrong:

• The company, not the provider, should own every subscription and admin login. When you change firms, you should not have to ask for your own books.
• Payroll posted as one lump "payroll" expense hides department costs and breaks gross margin.
• Stripe payouts booked as revenue, instead of gross charges less fees and refunds, understate both revenue and cost.
• Upgrading to an ERP before you have a clean chart of accounts just moves the mess to a more expensive system.

We do not quote software prices here because vendors change them often. Check current plans on the vendor sites before you budget.

Evaluate a firm on three things: who will actually do the work, what they deliver by which business day, and how they handle the parts of your business that are hard to account for. Price comes after those three.

Questions to ask before you sign:

1. Who is on my team by name and role, and who signs off on the monthly financials? Is that person a CPA?
2. What business day do you close by, and what is in the monthly package?
3. How many clients does my controller or CFO carry at once?
4. Show me a sample (redacted) deferred revenue schedule and board finance section for a company like mine.
5. How do you handle ASC 606 for annual prepaid contracts, usage-based pricing or implementation fees?
6. Who prepares the federal and state tax returns, and how do the books hand off to them?
7. Have you taken a client through a first financial statement audit? What did the auditors ask for?
8. What is included in the fixed fee, what is hourly, and what triggers a price change?
9. What happens to our data, logins and workpapers if we leave?

Red flags:

• Books kept on a cash basis after you have raised a priced round.
• No close calendar, or financials that arrive "when they are ready."
• A fractional CFO who cannot name the controller reviewing your books, or says one is not needed.
• The firm owns your accounting software subscription.
• Pricing quoted only in hours, with no description of deliverables.
• Reluctance to provide references from companies at your stage.

A tax point if you hire an individual rather than a firm: payments of $2,000 or more to an unincorporated contractor for services in 2026 require a Form 1099-NEC, up from $600 before 2026. And if that person works set hours under your direction, read the IRS common-law control factors (behavioral, financial and relationship) before you call them a contractor.

A switch to outsourced accounting, or from one firm to another, takes about one quarter to stabilize. Plan it so the first clean close lands at least one month before any board meeting or fundraise.

Days 1-30: access and cleanup.

1. Sign an engagement letter that lists deliverables, close day, team members and fees.
2. Grant admin access to the ledger, banks, cards, payroll, billing and the cap table, all under company-owned logins.
3. The new team reviews the last 12 months of books and lists cleanup items: unreconciled accounts, cash-basis entries, missing deferred revenue, uncategorized transactions.
4. Agree on a chart of accounts with department tracking.

Days 31-60: first close under the new process.

1. Complete cleanup entries and reconcile every balance sheet account to a supporting schedule.
2. Run the first monthly close against the new close checklist, even if it finishes late.
3. Set approval rules in the spend and bill-pay tools to match an approval matrix you sign off on.
4. Build the compliance calendar for the next 12 months.

Days 61-90: forward-looking work.

1. Hit the target close day for the first time.
2. The CFO or FP&A lead builds or rebuilds the operating model from the closed actuals.
3. Deliver the first full monthly package, including the metrics pack and 13-week cash forecast.
4. Hold a 90-day review: what was late, what was wrong, what needs to change in scope or price.

If you are leaving a previous provider, ask for the trial balance, all reconciliations and workpapers for the last two years before the last invoice is paid.

Hire your first full-time finance person when the outsourced work for one role would fill most of a full-time week, or when an audit, multiple entities or a full-time CFO's agenda makes daily in-house presence worth paying for. For most venture-backed companies that is between late Series A and Series B.

The first hire should usually be a senior accountant or controller, not a CFO. A finance team of one or two people works best like this:

• One person: an in-house senior accountant or controller who owns the close, the vendors and the auditors, working with an outsourced firm for bookkeeping volume and tax, and a fractional CFO for fundraising and the board.
• Two people: a controller plus a staff accountant or FP&A analyst, with the fractional CFO still in place until the company is ready to hire a full-time VP Finance or CFO.

Hire the CFO first only if a large raise, an acquisition or a debt process is the main job of the next 12 months and your books are already reliable. A CFO hired into messy books spends the first year as a very expensive controller.

When you do hire, keep the outsourced firm through at least two closes so the new person inherits working processes, not a handoff file. Use the 60-70% rule from the worked example, run it again each time you renew the engagement, and plan around the specific facts of your company; this guide is general information, not tax or accounting advice for your situation.