How to Create a Monthly Budget for Your Small Business

A small business budget is not about restricting yourself. It is a plan for where each dollar goes before the month starts, so taxes, bills and your own pay are covered on purpose instead of by luck. If you have been running your business from your bank balance, a simple monthly budget is the single biggest upgrade you can make. Here is how to build one in about an hour, with a worked example you can copy.

Why a monthly small business budget matters

Without a budget, most owners make decisions by glancing at the bank account. The problem is that the balance mixes money that is already spoken for (sales tax, income tax, next week’s bills) with money that is truly available. A budget separates the two.

A budget also gives you a yardstick. At the end of each month you can compare plan to reality, spot leaks early, and decide what to change. It works hand in hand with a short-term cash forecast: the budget says what should happen over the month, and a 13-week cash flow forecast shows when cash actually moves.

Step 1: Set a realistic revenue baseline

Do not budget from your best month. Use the average of your last six months, then trim it for safety.

Example: Lena runs a small printables and custom stationery shop. Her last six months of revenue were:

Month	Revenue
April	$7,800
May	$8,400
June	$6,900
July	$9,100
August	$8,200
September	$7,600
Total	$48,000

Six-month average: $48,000 ÷ 6 = $8,000. She budgets at 90% of that, $7,200, so a slower month does not break the plan. If your business is seasonal, use the same month from last year as a cross-check.

Step 2: List your fixed and variable costs

Pull real numbers from your bank statements and books, not memory. Group them into categories you already use; our list of small business expense categories is a good starting point.

• Variable costs rise and fall with sales: materials, packaging, marketplace and payment fees, shipping supplies.
• Fixed costs stay about the same: software, insurance, phone and internet, regular contractor help, marketing you commit to.

Express variable costs as a percentage of revenue, so the budget adjusts automatically if sales change.

Step 3: Build the budget

Here is Lena’s monthly budget on $7,200 of planned revenue:

Line	Amount
Planned revenue	$7,200
Materials and supplies (30% of revenue)	$2,160
Marketplace and payment fees	$600
Software and subscriptions	$180
Marketing	$400
Insurance	$120
Phone and internet (business share)	$90
Office and shipping supplies	$150
Part-time contractor	$500
Total expenses	$4,200
Profit before tax	$3,000

Check: $2,160 + $600 + $180 + $400 + $120 + $90 + $150 + $500 = $4,200, and $7,200 − $4,200 = $3,000.

Step 4: Give your profit a job

Profit is not spending money until you decide what it is for. Lena splits her $3,000 like this:

Use of profit	Share	Amount
Tax set-aside	25%	$750
Owner’s pay	—	$1,750
Cash buffer savings	—	$500
Total		$3,000

The tax percentage depends on your income, state and situation. Our guide on how much to set aside for taxes explains how to pick a number. Move the tax amount to a separate savings account each time you get paid, so it is never “accidentally” spent.

Paying yourself a fixed amount, rather than whatever is left, is what turns a busy business into a sustainable one. It also makes your personal budget far easier.

Step 5: Compare budget vs actual every month

At the start of each month, spend 20 minutes comparing last month’s plan to what really happened:

1. Enter actual revenue and expenses next to each budget line.
2. Calculate the difference in dollars and percent.
3. Flag any line that is off by more than about 10%.
4. Ask why: a one-time cost, a price increase, or a habit that needs to change?
5. Adjust next month’s budget only if the change is likely to stick.

Remember that a budget built on profit can still feel tight if customers pay late or you buy inventory ahead of a busy season. That is the classic gap between cash flow and profit, and it is why the cash buffer line matters.

Common budgeting mistakes

• Budgeting from your best month. Use an average and a safety margin.
• Leaving out annual costs. Divide yearly renewals (domain, insurance, software) by 12 and include them monthly.
• No owner’s pay line. If you are not in the budget, you are paid last, or not at all.
• Ignoring taxes until April. Set them aside every month.
• Never revisiting the plan. A budget you do not compare against reality is just a wish list.

Bottom line

A good small business budget fits on one page:

• [ ] Revenue baseline from a six-month average, trimmed for safety
• [ ] Variable costs as a percentage of revenue
• [ ] Fixed costs from real statements, including annual costs divided by 12
• [ ] A tax set-aside, owner’s pay and a cash buffer line
• [ ] A monthly budget vs actual review

If you want the formulas done for you, the Fyscale bookkeeping and cash flow templates include a monthly budget tab that compares plan to actual automatically.