Plain definition
A budget is an approved plan for how a business intends to earn, spend, invest, and use cash over a stated period. It translates choices into limits and commitments: which hires can start, which projects can proceed, and how much cash must remain available.
A budget is different from both a target and a forecast. A target states the result management wants. A forecast states the result management currently expects. The budget is the agreed resource plan against which managers explain changes and request new approval.
Illustrative example
Monetary examples use Saudi riyals (SAR). The same principles apply in other currencies.
Suppose a company prepares a monthly cash budget. It expects customer collections of , supplier payments of , payroll of , and marketing payments of . The listed flows give net cash of before other operating costs, tax, investment, and financing flows.
In the month, collections are rather than . The plan does not mean the company should pretend the original figure will occur. It shows the decision now required: defer spending that can wait, improve collections, revise the forecast, or approve a different use of cash.
A budget can include contingency for a named risk. Hiding an unexplained cushion to make a target easier is budgetary slack, not contingency.
Why it matters
Without an approved resource plan, a founder can approve several sensible expenses separately and discover too late that they compete for the same cash or capacity. Comparing actual results with the budget also makes the reason for a miss visible: price, volume, timing, cost, or a decision that changed the plan.
Practical consequence
Build the budget from the operating choices that cause the numbers: customer volume and price, the capacity to fulfil orders, hiring dates, supplier terms, capital commitments, and collections timing. Name a responsible person for each material line and state the assumption behind it.
At each review, compare actual results and the latest forecast with the approved budget. Explain the material difference, decide whether to correct operations or formally reallocate resources, and keep the original budget visible so the decision trail is not lost.