After completing this lesson, you’ll be able to explain what a budget is and why it matters, prepare a simple operating budget, compare actual results to budgeted amounts (variance analysis), and describe the different types of budgets businesses use.
What a budget is
A budget is a financial plan expressed in numbers. It takes what the business expects to happen — revenue, expenses, capital purchases, cash needs — and puts it in the same format as the financial statements. This creates a benchmark: once the period ends, the business can compare what actually happened to what was planned.
Budgeting is where accounting shifts from recording the past to shaping the future. Every number in a budget is a prediction, and predictions are wrong — but the process of making them forces the business to think through its assumptions, identify risks, and coordinate across departments.
Why budgets matter
Budgets serve four overlapping purposes:
- Planning. The budget forces the business to think ahead about revenue expectations, staffing needs, purchase timing, and cash requirements. A business that doesn’t plan is guessing.
- Coordination. Different departments have to agree on assumptions. The sales forecast drives the production plan, which drives the purchasing budget, which drives the cash budget. If sales expects to sell 10,000 units and production plans for 5,000, the business has a problem — and the budgeting process is where that gets caught.
- Control. Comparing actual results to the budget reveals problems early. If expenses are 20% over budget in March, the business can investigate before the year is over. Without a budget, there’s no benchmark to trigger that investigation.
- Performance evaluation. Managers are often evaluated on their ability to meet budgeted targets [citation needed]. The budget sets a standard for what “good” performance looks like.
The master budget
A master budget is the collection of all the individual budgets a business prepares. For a simple business, the key components are:
- Sales budget — Projected revenue based on expected unit sales and prices. This is the starting point because almost everything else depends on it.
- Production/purchases budget — What needs to be produced or purchased to support the sales forecast. A retailer budgets purchases; a manufacturer budgets production.
- Operating expense budget — Planned spending on rent, salaries, utilities, marketing, and other operating costs.
- Cash budget — Projected cash inflows and outflows to ensure the business doesn’t run out of cash. This is critical — a profitable business can fail if it runs out of cash, because revenue recognition and cash collection don’t happen at the same time.
- Budgeted income statement — The expected income statement based on the budgets above.
- Budgeted balance sheet — The expected balance sheet at the end of the budget period.
Each budget feeds into the next. Change the sales forecast and every downstream budget changes with it.
Preparing a simple operating budget
Worked example. A small retail business is budgeting for Q2 (April through June).
Assumptions:
- Sales forecast: April 35,000, June $40,000
- Cost of goods sold runs at 60% of revenue
- Monthly fixed operating expenses: Rent 8,000, Utilities 1,000
Budgeted income statement:
| April | May | June | Q2 Total | |
|---|---|---|---|---|
| Revenue | $30,000 | $35,000 | $40,000 | $105,000 |
| COGS (60%) | $18,000 | $21,000 | $24,000 | $63,000 |
| Gross Profit | $12,000 | $14,000 | $16,000 | $42,000 |
| Rent | $2,000 | $2,000 | $2,000 | $6,000 |
| Salaries | $8,000 | $8,000 | $8,000 | $24,000 |
| Utilities | $500 | $500 | $500 | $1,500 |
| Marketing | $1,000 | $1,000 | $1,000 | $3,000 |
| Total Operating Expenses | $11,500 | $11,500 | $11,500 | $34,500 |
| Net Income | $500 | $2,500 | $4,500 | $7,500 |
Notice how the fixed expenses stay flat at 500 net income) — if the sales forecast is even slightly off, April could show a loss. That’s useful to know in advance.
Variance analysis
After the period ends, the business compares actual results to the budget. The difference between actual and budgeted amounts is a “variance.”
- Favorable variance — Actual is better than budget. Higher revenue or lower expenses than planned.
- Unfavorable variance — Actual is worse than budget. Lower revenue or higher expenses than planned.
Worked example. Here’s how Q2 actually turned out compared to the budget:
| Budget | Actual | Variance | F/U | |
|---|---|---|---|---|
| Revenue | $105,000 | $100,000 | ($5,000) | Unfavorable |
| COGS | $63,000 | $62,000 | $1,000 | Favorable |
| Gross Profit | $42,000 | $38,000 | ($4,000) | Unfavorable |
| Rent | $6,000 | $6,000 | $0 | — |
| Salaries | $24,000 | $25,000 | ($1,000) | Unfavorable |
| Utilities | $1,500 | $1,400 | $100 | Favorable |
| Marketing | $3,000 | $3,000 | $0 | — |
| Total Operating Expenses | $34,500 | $35,400 | ($900) | Unfavorable |
| Net Income | $7,500 | $2,600 | ($4,900) | Unfavorable |
Revenue came in 1,000 below budget, a favorable result — the business negotiated better prices from suppliers. But salaries ran 4,900 short of the plan.
The point of variance analysis isn’t to assign blame — it’s to understand why reality differed from the plan and to improve the next forecast. Was the revenue shortfall caused by a bad sales estimate, a lost customer, or an economic slowdown? Each explanation leads to a different response.
Types of budgets
Not all budgets work the same way. The approach a business uses depends on its size, stability, and management philosophy.
Static budget. Set at the beginning of the period and doesn’t change. Simple to prepare and easy to understand, but it can be misleading if actual volume differs significantly from planned volume. If you budgeted expenses assuming 1,000 units of sales but actually sold 1,200 units, expenses will naturally be higher — and a static budget comparison makes it look like the business overspent.
Flexible budget. Adjusts for actual volume. If the business planned for 1,000 units but sold 1,200, the flexible budget recalculates variable costs at the 1,200-unit level. This separates volume effects (we sold more, so costs went up) from efficiency effects (we spent more per unit than we should have). Flexible budgets give a fairer picture of performance.
Zero-based budget. Every expense must be justified from scratch each period — no carrying forward amounts “because we spent it last year.” This prevents spending inertia, where departments keep getting the same allocation regardless of whether they need it. Zero-based budgeting takes more work but can uncover waste that traditional budgeting misses [citation needed].
Rolling budget. Continuously updated by adding a new month or quarter as one expires. If the current budget covers January through December, when January ends, the business adds the following January, so the budget always covers twelve months ahead. Rolling budgets keep the planning horizon constant and force regular re-evaluation of assumptions.
Self-check exercises
Exercise 1. A business budgeted 30,000 in expenses for March. Actual revenue was 28,500. Calculate the variances and identify each as favorable or unfavorable.
Answer
Revenue variance = 50,000 = ($2,000) Unfavorable. The business earned less than planned.
Expense variance = 30,000 = ($1,500) Favorable. The business spent less than planned. (For expenses, “less than budget” is favorable.)
Net income variance: Budgeted net income was 30,000 = 48,000 − 19,500. The net variance is ($500) unfavorable — the revenue shortfall more than offset the expense savings.
Exercise 2. Why might a profitable business need a cash budget?
Answer
Because revenue recognition and cash collection don’t happen at the same time. Under accrual accounting, a business recognizes revenue when it’s earned — not when the customer pays. A business can show $100,000 in profit on the income statement while its bank account is empty because customers haven’t paid their invoices yet.
A cash budget tracks the timing of actual cash inflows and outflows. It answers: “Will we have enough cash in the bank next month to cover payroll, rent, and supplier payments?” Without one, a profitable business can fail simply because it ran out of cash before collections caught up.
Exercise 3. A business forecasts selling 500 units at 8 per unit. Fixed costs are $3,000 for the period. Prepare a simple budgeted income statement.
Answer
| Amount | |
|---|---|
| Revenue (500 × $20) | $10,000 |
| Variable Costs (500 × $8) | $4,000 |
| Contribution Margin | $6,000 |
| Fixed Costs | $3,000 |
| Net Income | $3,000 |
The contribution margin (12 (8) toward fixed costs. The business needs to sell at least 250 units (12) just to break even.
Exercise 4. A manager’s department spent 10,000. The manager argues the budget is unfair because actual sales volume was 20% higher than planned. Is this a valid argument?
Answer
Yes — if the department’s costs are variable (meaning they rise and fall with volume), a static budget comparison is misleading.
If the budget assumed 1,000 units and actual volume was 1,200 units (20% higher), a flexible budget would adjust the expense target upward. At the original rate of 10,000 / 1,000 units), the flexible budget for 1,200 units would be $12,000 — exactly what the manager spent.
Under a flexible budget comparison, the manager has zero variance. The apparent $2,000 overspend was entirely caused by higher volume, not inefficiency. The static budget made the manager look bad by comparing actual costs at one volume level to budgeted costs at a different volume level.
This is precisely why flexible budgets exist — they separate the volume effect from the efficiency effect, giving a fairer evaluation of performance.
What comes next
Budgeting connects accounting to planning and decision-making — it’s where the record-keeping discipline starts to become a management tool. With the foundational topics covered, subsequent lessons can explore specialized areas: cost behavior and how costs respond to changes in volume, managerial accounting decisions, or the standards frameworks (GAAP, IFRS) that govern financial reporting.