PRACTICAL SME GUIDE
Budget versus forecast: which planning question each answers
A budget and a forecast both look forward, but they answer different questions. A budget is the plan you approved: what you intend to earn, spend and allocate. A forecast is your current best estimate of what is actually likely to happen, updated when new information arrives. Keeping the two separate — and comparing both with actual results — is what turns planning into a decision tool rather than a single set of numbers.
What does a budget tell you?
A budget sets the reference point for a period. It states the revenue you are aiming for, the costs you plan to incur to reach it, and how resources are allocated between activities. It is normally held steady for the period so that performance can be measured against a stable target. A budget can still be revised deliberately — for example when it is formally re-approved — but the approved version is kept so that the comparison stays meaningful. If the budget is rewritten every time conditions change, there is no fixed reference left. A budget is an estimate and a decision about priorities, not a guarantee of the result.
What does a forecast tell you?
A forecast answers a different question: based on the latest information and recent trends, what do we now expect? It is meant to change. Weaker sales or orders, a lost contract or an unexpected new order should all move the forecast, because its purpose is to support the decisions you make now. Regular reforecasting keeps the picture current without pretending the original plan never existed.
What do actual results show?
Actual results are the evidence: what was earned and what was spent in the period. Comparing actuals with the budget shows the variance, but only when the comparison is like-for-like — the same period, the same revenue-recognition basis and the same scope of income and costs. If the budget uses revenue and the actuals use cash receipts, the difference mixes a timing effect with a performance effect and the variance explains less than it appears to. A variance on its own is a number, not yet a lesson — the useful part is the explanation of why it happened and what, if anything, will be done differently.
How do the three views compare?
| Budget | Forecast | Actuals | |
|---|---|---|---|
| What it is | The approved plan for the period | The latest best estimate of what is likely | What actually happened |
| What it is for | Setting targets and allocating resources | Supporting the decisions you make now | Providing the evidence for variance analysis |
| How it changes | Held steady for the period; revised only by a deliberate re-approval | Updated whenever new information materially changes expectations | Recorded results; may be corrected or adjusted |
| Relation to the others | The reference point | Moves against the reference | Compared like-for-like with the budget |
How should an owner review them each month?
A short, repeatable routine is usually enough:
- Compare the period’s actuals with the budget on the same basis.
- Explain the material variances in one or two sentences each.
- Update the forecast for the months ahead using what you now know.
- Keep the original target in view, so improvement or slippage stays measurable.
The loop is budget → actual → forecast, repeated each period. The budget stays as the reference; the forecast moves; the actuals are the evidence. None of the three replaces the others.
What does this guide not tell you?
A budget is not a prediction and a forecast is not a commitment. A variance is not proof of good or poor management, and none of these views is a funding, tax, audit or legal opinion. This guide is general education, not advice for a specific transaction, and it makes no claim about any business’s results.
Budget and forecast questions
Should a forecast replace the budget?
No. Keep the approved budget as the reference point and update the forecast as new information changes the likely outcome.
How often should an SME update its forecast?
Update it when new information materially changes expectations. A short monthly review is a practical starting rhythm for many SMEs.
Why must actuals and budget use the same basis?
A like-for-like comparison uses the same period, revenue-recognition basis and scope. Otherwise the variance mixes timing or classification differences with performance.
Discuss your bookkeeping and planning
EGA’s Finance & Bookkeeping Core support covers monthly bookkeeping, bank and key-ledger reconciliations, and reporting packs with financial observations. Budgets, forecasts and variance reviews are planning support under Management & CFO Advisory, so they can be discussed separately and are not assumed to be part of every bookkeeping scope. Share how planning currently works in your business so the right scope can be discussed.
Discuss your bookkeeping on WhatsAppTax, audit and legal opinions are separate unless arranged with an appropriately qualified professional.
Which public sources support this guide?
- ACCA, Planning, budgeting and forecasting: an eye on the future — https://www.accaglobal.com/an/en/professional-insights/global-profession/planning-budgeting-and-forecasting-an-eye-on-the-future.html (accessed 20 September 2026).
- Australian Government, Create a budget — https://business.gov.au/finance/financial-tools-and-templates/create-a-budget (accessed 20 September 2026).