A pro forma income statement is a projected P&L — next year’s revenue, costs and profit built from assumptions instead of history. It is the centerpiece of budgets, pitch decks and loan applications, and the part of Pro Forma Financial Statements that gets read first.
Build it in five steps
- Project revenue from a driver, not a wish: units × price, customers × ARPU, or capacity × utilization. “Revenue grows 40%” is a hope; “sales team of 6 closing 3 deals/month at $8K” is a model.
- Split costs by behavior: variable costs as a percentage of revenue, fixed costs from known commitments (Fixed Costs helps classify).
- Subtract to operating income — the line that shows whether the business itself works (see Operating Income).
- Layer in interest and tax to reach projected net income.
- Sanity-check the margins against your own history and industry norms — projected margins that beat the best year ever need a written reason.
Mini example
Current year: revenue $1.0M, variable costs 40%, fixed costs $420K → operating income $180K. Pro forma: revenue $1.4M (two new salespeople, modeled), variable stays 40% ($560K), fixed rises to $520K (their salaries + tools) → projected operating income $320K. Every number traces to an assumption someone can challenge — that traceability is the whole difference between a model and a spreadsheet-shaped guess.
The three classic sins
Hockey-stick revenue with flat costs; forgetting that growth consumes cash (receivables and inventory grow too); and “conservative” scenarios that are just the base case minus 10%. A credible pro forma shows the downside case honestly — lenders and investors trust the document more, not less, when it admits what could go wrong.
What is the difference between a budget and a pro forma income statement?
A budget is an internal target with accountability attached; a pro forma is a projection for planning or external presentation. Same skeleton, different job.
How many years should a pro forma cover?
One year monthly for operations, three to five annually for investors — beyond five, assumptions dominate and credibility fades.
Should a pro forma follow GAAP?
The format should be recognizably GAAP-shaped, but pro formas are by nature non-GAAP; public companies must reconcile them to GAAP figures.