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What is a budget and why does a small business need one?
A budget is a plan of income and expenses by category for a given period. It answers “what do we expect and what can we afford” and creates a reference point: without a plan you cannot say whether a month went well.
A budget is not the same as a forecast or a payment calendar. The budget sets targets and limits for the period (how much we want to earn and spend). A forecast updates expectations with new data. A payment calendar shows cash movement day by day (more here). The three work together.
In a small business a budget gives three practical things: control of spending before it gets out of hand, a basis for decisions (hire, buy, raise prices) and a calmer conversation with a bank or partner.
How to build a budget: 5 steps
Define categories
List 10–25 income and expense lines. Split income by source and costs into variable (they move with sales volume) and fixed (rent, salaries). Use the same categories as in your reports so comparison is easy.
Take a baseline from past data
Gather actual amounts for the last 6–12 months by category and look at seasonality. If there is no history, rely on contracts, quotes and cautious estimates, and mark them as assumptions.
Plan income and expenses
Income first, and conservatively: it is better to underestimate. Set variable costs as a percentage of revenue and fixed costs from contracts. Do not forget one-off and annual payments such as taxes, insurance and repairs.
Build in a reserve
Allocate a separate line for a safety cushion. A common guideline is one to three months of fixed costs, though the real target depends on how stable your income is. The reserve is an allocation of profit, not an expense.
Compare plan and actual every month
After closing the month, compare actual with planned amounts, explain significant variances (for example above 10% and above a minimum amount) and update assumptions for the coming months. A budget lives as long as someone reads it.
Template: structure of a monthly budget
Illustrative amounts in EUR for a small service business. The notes in the third column are your own guidelines, not norms.
| Budget line | Plan, EUR | How to set it |
|---|---|---|
| Revenue | 20,000 | Historical average adjusted for season and contracts |
| Direct costs (cost of sales) | 7,000 | 35% of revenue, variable |
| Gross margin | 13,000 | Revenue − direct costs (65%) |
| Salaries | 6,000 | From the staffing plan, fixed |
| Rent | 2,500 | From the contract, fixed |
| Marketing | 800 | Percentage of revenue or a fixed sum |
| Utilities and services | 700 | From average bills |
| Other expenses | 500 | Small items and the unexpected |
| Total operating expenses | 10,500 | Sum of the fixed and variable lines above |
| Operating result | 2,500 | Gross margin − operating expenses |
| Transfer to reserve | 1,000 | Reserve target divided by the number of months |
| Remainder after reserve | 1,500 | Result − reserve: for growth, taxes, owner payouts |
How do you check the table and read a variance?
Arithmetic: 6,000 + 2,500 + 800 + 700 + 500 = 10,500; 20,000 − 7,000 = 13,000; 13,000 − 10,500 = 2,500; 2,500 − 1,000 = 1,500.
Suppose revenue came in at 18,000 (plan 20,000) and operating expenses at 11,130 (plan 10,500). Revenue variance: 18,000 − 20,000 = −2,000, or −10%; plan execution is 90%. Expense variance: 11,130 − 10,500 = +630, or +6%. For income a minus is bad; for expenses a plus is bad. Now the questions become specific rather than “why is everything bad”: what happened with customers, which expense lines overshot, and is it temporary.
Common budgeting mistakes
- An over-detailed budget with hundreds of lines that nobody can maintain.
- An optimistic revenue forecast with no margin and no seasonality.
- A budget prepared in January and forgotten until December.
- No reserve, so any hiccup forces you to borrow.
- Missing one-off and annual payments: taxes, insurance, repairs.
- Mixing cash and accrual views: some data by payment date, some by period.
- Nobody responsible for the budget and for explaining variances.
- Comparing plan and actual only once a year or only in total figures.
How Financist does it
In Financist a budget is created for a month, a quarter or a year, starting in any month, and consists of lines by income and expense category with amounts per month. You can keep several scenarios for the same period, such as base and optimistic. A budget can be copied to the next period, optionally seeded from actual data and multiplied by a factor. Once approved, its structure is locked, and the plan is compared with actuals on a cash or accrual basis: you see the variance, execution percentage and whether the variance is favourable. Actuals that were not budgeted are listed separately. Budgets are calculated in the base currency and the report exports to CSV. More on the budgets page; actuals come from the cash flow report.
Budgeting terms
- Plan vs actual
- A comparison of planned and actual amounts for a period, line by line.
- Variance
- The difference between actual and plan, in absolute terms and as a percentage of plan.
- Variable costs
- Costs that rise and fall with sales volume, such as the cost of goods sold.
- Fixed costs
- Costs that barely depend on sales volume in the short run: rent, salaried staff.
- Scenario
- A version of the budget under certain assumptions: base, optimistic, pessimistic.
Frequently asked questions
What period should a small business budget cover?
Usually a year split by month. For an unstable business or in the first years it also helps to keep a short horizon, such as a quarter reviewed monthly. The annual budget sets the direction, and monthly adjustments keep it realistic.
How is a budget different from a forecast?
A budget is an approved plan and target for the period against which actuals are compared. A forecast is a current estimate of what will probably happen, given new data. Budgets are changed rarely, forecasts updated more often. The gap between them is a signal that action is needed.
How many categories should a budget have?
For a small business 10–25 lines are enough. Each category should be clear and make it easy to find the actuals. Group small expenses together. Break down only what materially affects the result or what you intend to control.
What if the business has no history?
Build the budget from contracts, quotes, supplier prices and conservative estimates. Mark the assumptions clearly and review the budget monthly as actuals arrive. For the first 3–6 months the budget is a hypothesis you test against data.
How large should the reserve in the budget be?
There is no universal figure. A common guideline is one to three months of fixed costs, depending on how stable income is. The more irregular your receipts, the larger the reserve worth building. Put the transfer to reserve on its own line so it does not dissolve into expenses.