There is a difference, but it is less about the math and more about ownership, controls, review, and consequences of getting it wrong.
For both an SMB and a public company, financial modeling should be done by someone who understands the business drivers, not just Excel. But in a public company, the model usually needs a formal process around it because it may support guidance, board materials, liquidity planning, impairment analyses, debt covenant forecasts, investor communications, or SEC reporting.
The simple answerFor an SMB, financial modeling can often be owned by the founder, CEO, controller, finance manager, outsourced CFO, or fractional CFO, depending on complexity. The goal is usually practical decision-making: cash runway, hiring, pricing, debt capacity, inventory, margin, expansion, or fundraising. In other words....me.
For a large public corporation, financial modeling should generally be owned by the FP&A / corporate finance function, with input from business-unit finance, accounting, treasury, tax, legal, investor relations, and operations. Final accountability typically rolls up to the CFO, with board/audit committee oversight for material matters. Public companies have additional reporting and internal-control obligations; annual and quarterly filings provide investors with financial results, risks, and management’s discussion of business performance.
Best-practice ownership model| Company type | Who builds the model | Who owns it | Who reviews/challenges it |
|---|---|---|---|
| Small SMB | Founder, operator, bookkeeper, controller, outsourced finance consultant, or fractional CFO | Owner/CEO or finance lead | CPA, lender, investor, advisor, or board member |
Growing SMB / lower middle market | Controller, finance manager, FP&A hire, fractional CFO, or consultant | CFO/VP Finance/CEO | CEO, department heads, CPA, lender, board |
Private equity-backed / debt-heavy SMB | CFO/FP&A with operating-team inputs | CFO | Sponsor, board, lender, accounting, outside diligence advisors |
| Large private company | FP&A team, business-unit finance, treasury, strategy | CFO / corporate finance leadership | Controller, internal audit, board, external advisors |
| Public company | FP&A/corporate finance, business-unit finance, treasury, tax, accounting, IR, strategy | CFO and finance leadership | Controller, disclosure committee, legal, internal audit/SOX team, audit committee, external auditor where relevant |
Not every model needs the same rigor.
A decision model helps management decide whether to hire, expand, raise prices, buy equipment, acquire a company, or conserve cash. In an SMB, this can be lightweight and fast as long as assumptions are clear.
A reporting-support model supports numbers or judgments that may flow into financial statements, SEC filings, investor guidance, debt covenant compliance, impairment testing, tax planning, stock compensation, or liquidity disclosures. In a public company, those models usually need documentation, version control, assumptions approval, change logs, access controls, and independent review. Public companies are subject to internal-control-over-financial-reporting expectations; PCAOB standards address audits of management’s assessment of internal control over financial reporting, and SOX Section 404 requires management to assess internal controls, with auditor attestation applying to many public companies.
Who should not be the sole ownerThe model should not be owned solely by someone who lacks business context. A technically skilled analyst can build a beautiful but useless model if they do not understand sales cycles, margins, working capital, churn, capex, seasonality, pricing, or operational constraints.
It also should not be owned solely by the business sponsor without finance review. A sales leader, founder, or division head may understand the business deeply but may be too optimistic or may not properly link revenue, costs, cash, balance sheet impacts, taxes, covenants, and accounting treatment.
For public companies, the external auditor should generally not build management’s model if it is something they will later audit or rely on, because auditor independence rules matter. PCAOB rules require registered public accounting firms to be independent of audit clients throughout the engagement, and SEC auditor-independence guidance warns that prohibited non-audit services can impair independence.
What to consider when deciding who should do itThe right person or team depends on these factors:
1. Purpose of the model
A cash forecast for payroll survival is different from a board forecast, valuation model, lender model, public-company guidance model, or impairment model.
2. Materiality
The more money, investor reliance, debt exposure, or reporting consequence attached to the model, the more formal the process should be.
3. Complexity of the business
Multiple products, locations, countries, entities, currencies, inventory, deferred revenue, recurring revenue, capex, debt, tax jurisdictions, or acquisitions all increase modeling complexity.
4. Accounting linkage
A good model should usually connect the income statement, balance sheet, and cash flow statement. SMB models often fail because they forecast revenue and EBITDA but ignore cash conversion, working capital, taxes, debt service, and capex.
5. Operational input
Finance should not invent the assumptions alone. Sales should inform pipeline and bookings. Operations should inform capacity and labor. Procurement should inform costs. HR should inform hiring. Treasury should inform liquidity and debt. Accounting should reconcile actuals.
6. Controls and review
At an SMB, this might mean a second person checking formulas, reconciling to accounting records, and documenting assumptions. At a public company, this can mean formal internal controls, access restrictions, review evidence, tie-outs to source systems, audit trails, and disclosure controls. COSO’s internal-control framework is widely used as a basis for designing and evaluating controls over reporting and risk.
7. Bias and incentives
Models are often political. A founder may need the model to justify a raise. A sales leader may want aggressive bookings. A cost center may sandbag expenses. A CFO may want to manage guidance. The modeler should surface assumptions clearly enough that bias can be challenged.
For an SMB, the best setup is usually:
Business owner/operator provides assumptions → finance-capable person builds the model → CPA/fractional CFO/advisor reviews it.
For a public company, the best setup is usually:
Business units provide drivers → FP&A consolidates and models → accounting/controller validates actuals and accounting treatment → CFO owns the forecast → legal/IR/disclosure teams review investor-facing use → internal audit/SOX reviews controls where material → board/audit committee reviews high-stakes outputs.
Rule of thumbThe person doing the modeling should have three things:
- Business understanding — knows what actually drives revenue, margin, working capital, and cash.
- Financial/accounting skill — can build an integrated model and avoid cash/accounting mistakes.
- Independence and discipline — can document assumptions, challenge optimism, and produce a model someone else can audit or review.
So, yes, there is a difference. In an SMB, the model can be more founder-led and practical. In a public company, the model needs to be institutionally owned, controlled, documented, and reviewed because it can affect investor-facing reporting, governance, and regulatory risk.
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Article found in Accounting and Finance.
