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CFO responsibilities fall into two buckets. The first is keeping the company's financial house in order: accurate books, enough cash, controls that stop errors and fraud, and tax and regulatory filings that go in on time. The second is using that information to decide where the company goes next, from pricing and hiring to fundraising and an eventual sale. A bookkeeper or controller can handle much of the first bucket. The second is what founders are really paying for when they bring in a chief financial officer.
The chief financial officer is the senior executive accountable for a company's finances. The CFO usually reports to the CEO, sits on the executive team and is the main finance contact for the board, investors, lenders and auditors. The controller, accounting staff and FP&A team (if there is one) report up to the CFO.
The U.S. Bureau of Labor Statistics describes the CFO as the executive "responsible for the accuracy of an organization's financial reporting," and notes that experienced financial managers often advance into the role. Most CFOs come up through public accounting, corporate finance, or FP&A and controller roles, and many hold a CPA license, an MBA or both.
| Responsibility | What it involves | What it looks like in a $5M company | What it looks like in a $50M company |
|---|---|---|---|
| Planning and analysis (FP&A) | Budget, forecast, scenario models, variance reviews | CFO builds the model personally | CFO directs an FP&A team |
| Cash and treasury | Cash forecasting, banking, credit lines, working capital | Weekly cash forecast, one bank, one line of credit | Treasury policy, multiple banks, covenant tracking |
| Financial reporting | Close, GAAP statements, board and lender reporting | Oversees an outsourced or one-person accounting team | Owns audit relationship, consolidations, management reporting |
| Controls and risk | Internal controls, insurance, fraud prevention | Approval limits, segregation of duties, bank access | Documented control framework, audit committee reporting |
| Capital and investors | Equity and debt raises, cap table, investor updates | Leads the seed or Series A data room | Manages bank syndicates, investor relations, possibly IPO readiness |
| Tax oversight | Strategy and compliance across federal, state and payroll | Works with the outside CPA on structure and estimates | Manages a tax provision, multistate and possibly international filings |
| Business performance | Unit economics, pricing, KPIs, cost management | Defines the five or six metrics the founder watches | Runs a performance cadence across business units |
| Transactions | Acquisitions, divestitures, exit preparation | Prepares the company for diligence | Leads deals, integration and purchase accounting |
The CFO owns the annual budget and the rolling forecast that replaces it during the year. In a small company this is usually one driver-based model: headcount, pricing, volume and collection timing flowing into a projected P&L, balance sheet and cash flow. Our step-by-step guide to creating a business budget covers how to build the first version.
The forecast only earns its keep if someone compares it with actual results each month and explains the gaps. That monthly review, covered in our guide to variance analysis, is where a CFO spots margin erosion or a slipping sales pipeline before it shows up in the bank balance.
Scenario modeling is the other half. Before a founder opens a second location or adds ten engineers, the CFO models the base case, a downside case and the cash each one consumes, so the decision is made on runway rather than optimism.
Profitable companies still run out of cash when receivables stretch, inventory builds or a large customer pays late. The CFO forecasts cash at a level of detail that matches the risk. For a company with a tight runway, that means a 13-week cash flow forecast updated every week. For a stable business, a monthly forecast built with the cash flow forecasting tools and techniques that fit its seasonality may be enough.
Treasury work includes setting up bank relationships and credit lines before they're needed, negotiating payment terms with customers and vendors, deciding where idle cash sits, and tracking loan covenants so a breach never comes as a surprise.
The CFO doesn't post journal entries, but they're accountable for the numbers being right and on time. In practice that means owning the close calendar, approving key judgments (revenue recognition, reserves, capitalization policies), and reviewing the financial statements before they go to the board, lenders or investors.
Once a company needs audited or reviewed financial statements, the CFO also manages the auditor relationship. If you're deciding how to split this work between a controller and a part-time CFO, our article on controller vs fractional CFO roles lays out a practical 90-day division of labor.
Controls are the procedures that keep errors and fraud out of the books: approval limits on payments, separation between who sets up vendors and who pays them, bank reconciliations reviewed by someone other than the preparer, and restricted system access. Larger companies and their auditors usually map these against the COSO Internal Control framework. Smaller companies can start with a short list and test it, as described in our guide to internal controls testing for small businesses.
Beyond accounting, the CFO typically owns the insurance program, customer concentration and credit risk, and interest rate and currency exposure.
When a company raises equity or debt, the CFO builds the financial model behind the ask, prepares the data room and answers diligence questions. Good preparation means investors see clean historicals, a forecast whose assumptions tie to actual results, and a use-of-funds plan linked to specific milestones. Our article on how fractional CFOs help attract investors covers what that preparation looks like for seed through Series B rounds. After the round closes, the CFO owns investor updates, board reporting and the cap table.
Most CFOs aren't tax preparers, but they're responsible for the tax position. That includes entity structure, estimated payments, sales tax and payroll tax compliance, and planning around law changes. The One Big Beautiful Bill Act, signed in July 2025, is a recent example: it restored immediate deduction of domestic research and experimental expenditures for tax years beginning after December 31, 2024, according to the IRS summary of the law's provisions. For a software or product company, that single change can move cash taxes materially, and it's the CFO's job to make sure the company and its outside CPA act on it.
The CFO decides which metrics leadership watches and makes sure they're calculated consistently. For a SaaS company that might be net revenue retention, gross margin and CAC payback (our SaaS CFO dashboard lists six we use). For a services firm it is utilization, realization and margin by client.
Pricing reviews, vendor renegotiations and headcount planning all run through this lens. A common early finding is that one product line or customer segment loses money once overhead is allocated.
The CFO decides what to hire, what to outsource and which systems the finance function runs on: accounting software, billing, expense management, payroll and reporting tools. Getting this wrong is expensive to unwind, so in a small company it's one of the first things a new CFO looks at.
The title carries personal exposure that founders don't always appreciate, and it differs for public and private companies.
Public companies. Under Section 302 of the Sarbanes-Oxley Act (15 U.S.C. § 7241), the principal executive and principal financial officer must certify each annual and quarterly report. They certify that they've reviewed it, that it contains no material misstatements or omissions, that the financial statements fairly present the company's condition, and that they're responsible for internal controls and have disclosed significant deficiencies and fraud to the auditors and audit committee. Section 906 adds criminal penalties for knowingly or willfully certifying a report that doesn't comply.
Every company with employees. Payroll taxes withheld from employees are trust fund taxes. If they aren't paid over to the IRS, the agency can assess the trust fund recovery penalty personally against any "responsible person" who willfully fails to pay. The penalty equals the unpaid trust fund tax. Corporate officers with authority over which bills get paid, which very often includes the CFO, are the usual targets. A CFO who lets payroll taxes slide to cover other bills during a cash crunch is putting their own assets at risk.
| Accountant / bookkeeper | Controller | CFO | |
|---|---|---|---|
| Time focus | Current transactions | Last month and quarter | Next quarter through next several years |
| Main output | Recorded, reconciled transactions | Accurate, timely financial statements | Plans, forecasts, capital and strategic decisions |
| Typical owner of | Payables, receivables, payroll entries, reconciliations | Close process, GAAP compliance, controls, audit prep | Budget, cash strategy, fundraising, board and investor reporting |
| Reports to | Controller | CFO (or CEO in smaller companies) | CEO and board |
The roles blur in small companies. A strong controller may build the budget, and a fractional CFO may review the close. Our comparison of bookkeeper vs accountant vs CPA vs CFO explains which role a company usually needs first.
Early stage (pre-revenue to roughly $2M). Most companies don't need a CFO yet. They need clean books, a bookkeeper or outsourced accountant, a simple cash forecast and an outside CPA for tax. A few hours of CFO-level help ahead of a fundraise is often enough.
Growth stage (roughly $2M to $20M). This is where fractional CFOs do most of their work. The priorities are a forecast the founder trusts, a faster close, unit economics by product or customer, the first audit, and fundraising or bank financing.
Scale stage (roughly $20M and up, or venture-backed with a large raise). A full-time CFO becomes common. The job shifts toward managing a team, running board and investor relations, multistate or international tax, M&A and, for some, IPO readiness.
These revenue bands are rough guides. A $4M company with complex inventory, debt covenants and an upcoming acquisition may need more CFO time than a simple $15M services firm.
| Option | Best fit | What to expect |
|---|---|---|
| Full-time CFO | Larger companies, frequent capital raises, public-company path | Daily involvement, leads a team; the most expensive option |
| Fractional CFO | Growth-stage companies needing strategic finance without a full-time salary | A set number of hours or days per month; often paired with outsourced accounting |
| Interim CFO | A gap after a departure, a turnaround, a transaction | Full or near-full-time for a defined period, then hands off |
Our guide to interim CFO responsibilities covers when a temporary leader makes sense. For budgeting, see current fractional CFO rates by industry. The comparison of a full-time CFO vs an outsourced CFO walks through the trade-offs in more depth.
Planning and forecasting, cash and treasury, financial reporting, internal controls, capital raising and tax oversight. In larger companies the CFO also leads acquisitions and manages the finance team.
The controller looks backward and makes sure the statements are accurate and on time. The CFO looks forward, using those statements to plan, raise capital and advise the board.
Most small businesses don't need a full-time CFO, but many benefit from part-time CFO help once revenue passes a few million dollars or when they're raising money, taking on debt or preparing for an audit. Before that point, clean books and a good outside CPA usually cover the essentials.
Yes. If payroll taxes withheld from employees aren't paid to the IRS, a CFO with authority over payments can be assessed the trust fund recovery penalty personally. At public companies, the CFO also signs SOX certifications that carry civil and criminal exposure.
In a startup the CFO is hands-on: building the financial model, managing runway, running fundraising diligence and setting up the accounting systems and controls the company will need for its first audit. Many startups use a fractional CFO for this until they reach a later funding round.
If you're doing most of this list yourself, start by listing which responsibilities are currently unowned, usually forecasting, controls and investor reporting, and decide which need a CFO and which a controller or outsourced team can handle. Madras Accountancy provides fractional CFO and outsourced accounting support for US businesses and the CPA firms that serve them. Talk to our team about the CFO support your business needs.
The section 4960 excise tax is 21% of nonprofit pay over $1M. From 2026 it covers all employees. See the medical carve-outs, Form 4720 and a worked example.
The paid family and medical leave tax credit is permanent from 2026. See the 12.5% to 25% rates, the premium option, the 6-month rule and how Form 8994 works.
Opportunity zones become permanent in 2027 under the One Big Beautiful Bill. See the new deferral, rural bonus, and the 2026 handoff.
