How many years should startup projections cover?

There is no universal rule. Fundability’s described document tool provides three-year projections; confirm the horizon and monthly detail required by the intended funder.

What assumptions should be included?

Include the drivers of revenue, cost, payment timing, staffing, capital spending and funding. Make the source, uncertainty and effect of each material assumption clear.

Financial planning

Startup financial projections: what to include

By Fundability · Updated 7 October 2026

Startup financial projections explain how the business expects to earn, spend and manage cash. A useful forecast links profit and loss, cash flow and the balance sheet, with explicit assumptions that a founder can explain. Forecasts are scenarios, not promises of future results.

Use three connected views

The profit and loss forecast describes revenue, costs and profit over a period. Cash flow describes the timing of cash receipts and payments. The balance sheet describes assets, liabilities and equity at a point in time. They answer different questions and should reconcile.

A profitable business can still run short of cash if customers pay later than suppliers must be paid. Similarly, purchasing equipment can affect cash and the balance sheet differently from the timing of the associated accounting expense. Have an accountant check the treatment where necessary.

Build revenue from operating assumptions

Begin with measurable drivers such as customers, units, contracts, prices, conversion and delivery capacity. Avoid a revenue total justified only as a small percentage of a large market. Link staffing and other costs to the activity needed to support sales.

For illustration, 20 customers paying £100 monthly produce £2,000 of monthly revenue before refunds, tax treatment and other adjustments. If the forecast assumes 200 customers three months later, explain the acquisition process and evidence supporting that change. This is an example of model logic, not a forecast for your business.

State the source and date of each important assumption.
Separate historical results, signed business and speculative pipeline.
Include payment terms, hiring dates and material one-off costs.
Test slower sales, delays and cost increases.

Show the funding requirement and milestone

Identify the lowest forecast cash balance and the dates that create it. Explain what funding is required, what it pays for and which milestone it enables. Keep this consistent with the pitch deck’s ask.

Fundability’s public features describe three-year profit and loss, cash-flow and balance-sheet projections. The appropriate horizon and level of detail depend on the reader and business; check a prospective investor’s or lender’s actual requirements.

Review an AI-generated forecast

AI can help organise assumptions and prepare a draft. It should not invent customer traction, tax treatments or historical accounts. Check formulas, timing, signs and opening balances as well as the narrative explanation.

Keep a base scenario and a downside scenario, then write a short note explaining what would make you change course. Review the forecast when actual results diverge materially from assumptions.

Frequently asked questions

How many years should startup projections cover?: There is no universal rule. Fundability’s described document tool provides three-year projections; confirm the horizon and monthly detail required by the intended funder.
What assumptions should be included?: Include the drivers of revenue, cost, payment timing, staffing, capital spending and funding. Make the source, uncertainty and effect of each material assumption clear.