---
name: Revenue Forecast & FP&A
description: Build a driver-based revenue forecast and FP&A model that a board will trust — grounded in unit economics, tested with scenarios and sensitivities, and honest about its assumptions, in the forward-looking financial-planning tradition EY is known for. For founders and finance leads forecasting revenue for a plan, a raise, or a runway decision.
audience: founder · CFO · FP&A analyst · finance lead
---

# Revenue Forecast & FP&A

## What this is

A method for forecasting revenue the way a defensible plan is built: bottom-up from drivers (customers × conversion × price × retention), not a top-down "we'll grow 20%." It grounds the model in real unit economics, makes every assumption explicit and sourced, tests the forecast with base/upside/downside scenarios and sensitivity on the variables that actually move the outcome, and reconciles the forward numbers to historical actuals so the plan is anchored, not aspirational. The deliverable is a model whose assumptions a board can interrogate line by line.

## What this is NOT

Not affiliated with or endorsed by EY or any advisory firm — it uses the publicly understood driver-based FP&A and scenario-planning discipline as a reference lens, not their methodology or brand. Not a prediction and not a promise — a forecast is a structured set of assumptions with a range, and anyone presenting a single number as certainty is misleading. Not audited, not investment advice, and not a valuation — those route to a CPA, counsel, or a licensed advisor. Every input is labelled assumption, estimate, or historical actual.

## Method

1. **Anchor on historical actuals.** Start from what actually happened — the base rates, the real conversion and retention — so the forecast is extrapolating reality, not inventing it.
2. **Model bottom-up from drivers.** Build revenue from its components (leads → conversion → customers → price → expansion → churn), not from a growth rate assumed onto last year. The drivers are where the argument lives.
3. **Make every assumption explicit and sourced.** Each driver's value is stated, justified, and labelled (historical, benchmark, or estimate) — a hidden assumption is an un-testable one.
4. **Ground in unit economics.** Tie the forecast to CAC, LTV, payback, and contribution margin so the growth is economically coherent, not just a rising line.
5. **Run scenarios.** Base, upside, and downside — each a coherent set of assumptions, not just the base ± 10% — so the range is real and the downside is genuinely stressed.
6. **Sensitise the drivers that matter.** Identify the two or three variables the outcome is most sensitive to and show how the forecast moves with them; that's where management attention belongs.
7. **Reconcile and sanity-check.** Tie the forward model back to actuals and to external reality (market size, capacity, sales headcount) — a forecast that implies impossible share or hiring is wrong somewhere.
8. **State the range and the risks.** Present the forecast as a range with its key assumptions and the risks to each, not a false-precision single number — and say what would make you revise it.

## Quality bar

The forecast is anchored on historical actuals · revenue is modelled bottom-up from drivers, not an assumed growth rate · every assumption is explicit, sourced, and labelled · it is grounded in unit economics (CAC/LTV/payback/margin) · base/upside/downside scenarios are coherent and the downside is genuinely stressed · sensitivities on the vital variables are shown · the model reconciles to actuals and external reality · the output is a range with assumptions and risks, not false-precision.

## Guardrails & escalation

An analytical method in the FP&A tradition — not affiliated with EY or any firm. A forecast is assumptions with a range, never a prediction or a promise; single-number false precision is avoided by construction. This is not audited financials, valuation, tax, or investment advice — a raise, a valuation, or a filing routes to a licensed CPA, valuation specialist, or counsel. Every input is labelled assumption, estimate, or actual, and the method states plainly what would change the forecast.

## References

- Catalogue: https://edwson.com/consumer-design-system.html · Contracts: https://edwson.com/cds/components.json · Agent brief: https://edwson.com/cds/AGENTS.md
- Related within this kit: the P&L & EBITDA, spend-analysis, market-position, and enterprise-health-score skills. Valuation, audit, and filings route to licensed professionals.