How to create a business budget

Most owners we meet have tried a budget once. It was built in a rush, it lived in a spreadsheet nobody opened again, and by March it bore no resemblance to the business. So the next year, they didn’t bother.

Here’s the short answer on how to create a business budget that works: start from last year’s real numbers, set a profit target first, build revenue from your actual drivers (jobs, covers, clients), budget costs line by line, spread it across the months, then compare actuals against it every month. The comparison is the part that turns a spreadsheet into a management tool.

This guide walks through the method we use as a virtual CFO with growing Australian businesses, with a worked example from a $4M electrical contractor.

In short:

A budget is your plan for the next 12 months, and it should start with the profit you want, not the revenue you hope for.
Build revenue from drivers you can control, like job numbers, average job value or covers per week.
Spread the budget across months to match your seasons, because a flat monthly number hides your cash pinch points.
Review budget against actual every month, ideally inside Xero, and act on the gaps.
Your budget sets the target and your cash flow forecast tells you if you can afford the path to get there.

What is a business budget, and why do most fail?

A business budget is your financial plan for the year ahead: the revenue, costs and profit you’re aiming for, month by month. business.gov.au recommends writing it once a year, with a mid-year review, and updating your forecast monthly or quarterly.

Most budgets fail for three reasons. They are built from hope rather than last year’s actual results. They are one annual number divided by 12. And nobody compares them to actuals, so they never change a decision.

That last point matters most. A budget only earns its keep when someone looks at the variances each month and asks what to do about them. This is the difference between a reactive accountant and a proactive accountant or CFO advisor.

An accountant shows you what already happened. A CFO shows you what to do next.

Budget vs forecast vs cash flow forecast: what’s the difference?

A budget is the target, a forecast is your latest best guess, and a cash flow forecast shows the money in the bank. Growing businesses need all three, and they each answer a different question.

Tool	Question it answers	How often to update	Built on
Budget	What are we aiming for this year?	Once a year, with a mid-year review	Profit and loss (excluding GST)
Rolling forecast	Where will we actually land?	Monthly or quarterly	Profit and loss, updated for actuals
Cash flow forecast	Will we have enough cash each week?	Weekly	Bank balance, including GST, BAS, super and loan repayments

If you only have time for one extra tool after the budget, make it the cash flow forecast. Our guide on building a 13-week cash flow forecast shows you how.

How do you create a business budget, step by step?

You create a business budget in seven steps, starting with last year’s actuals and ending with a monthly review routine. Set aside half a day for the first draft, and have your bookkeeping up to date before you begin.

Pull last year’s actual profit and loss. Export the last 12 months by month from Xero. If your bookkeeping is behind, fix that first, because a budget built on wrong numbers will be wrong too.
Set your profit target. Decide the net profit you want before you touch revenue. Work backwards: what does the business need to fund growth, pay the owners properly and build a cash buffer?
Build revenue from your drivers. Don’t just add 10%. Ask how many jobs, clients or covers you will do, at what average value. For a trade business that might be crews multiplied by billable days multiplied by revenue per day.
Budget cost of sales as a percentage. Materials, subcontractors and direct labour usually move with revenue. Set a target gross margin based on what you achieved and what pricing changes you plan.
Budget overheads line by line. Rent, insurance, software, vehicles, admin wages. Add any new hires at their full cost, including the 12% super guarantee, workers compensation and, where it applies, payroll tax.
Spread it across the months. Use last year’s monthly pattern as a guide. If January is always quiet and May is always big, your budget should show that.
Load it into Xero and review monthly. Xero’s budget manager lets you run a budget variance report each month. Look at the three biggest gaps and decide what you’ll do about each one.

Worked example: a budget for a $4M electrical contractor

This is an example with realistic numbers to show the method. It isn’t a client case study, and your numbers will differ.

Last financial year, the business turned over $4.0M with a 38% gross margin, so gross profit was $1.52M. Overheads were $1.10M, leaving net profit before tax of $420,000. The owner wants to grow without working longer hours.

Revenue

The owner plans a 4% price increase on new quotes and one extra crew from February. Working through crew days and revenue per day, that builds to $4.4M, a 10% lift.

Gross margin

Better job costing and fewer unbilled variations should move gross margin from 38% to 40%. On $4.4M, that’s a gross profit of $1.76M.

Overheads

Overheads start at last year’s $1.10M. Add 3% for price rises across existing costs ($33,000), plus a new estimator on a $98,000 salary. With 12% super, that’s about $110,000. Budgeted overheads come to $1.243M.

The result

Line	Last year (actual)	Budget
Revenue	$4,000,000	$4,400,000
Gross profit	$1,520,000 (38%)	$1,760,000 (40%)
Overheads	$1,100,000	$1,243,000
Net profit before tax	$420,000	$517,000

Profit lifts by $97,000, about 23%. Notice where most of it comes from. The two-point margin gain is worth $88,000 on its own ($4.4M multiplied by 2%). The extra revenue matters, but the margin work does most of the heavy lifting.

Now the cash check. The new crew starts in February, which is usually a slower month for this business. Wages, vans and tools go out weeks before the first invoices are paid. The budget says the year is profitable. The cash flow forecast shows whether February and March need a buffer or a finance facility to get there.

What should you include in a business budget in Australia?

Include every cost that hits your profit and loss, then plan separately for the Australian cash items that don’t. Owners usually get caught out by the second group.

In the profit and loss budget, include:

Revenue by stream, excluding GST
Cost of sales: materials, stock, subcontractors and direct wages
All wages at full cost, including super, leave loading and workers compensation
Payroll tax if your wages are above your state’s threshold. In Victoria, check the current threshold with the State Revenue Office
A fair wage for the owner, even if you take it as drawings
Depreciation on equipment and vehicles

In the cash flow plan, include GST and PAYG on your BAS, income tax instalments, loan principal repayments and equipment purchases. Our guide on how much to set aside for BAS each month covers the tax side.

One change to plan for this year: since 1 July 2026, under Payday Super, super generally needs to reach your employees’ funds within 7 business days of payday. The cost hasn’t changed, but the timing has, so your cash plan should show super leaving with every pay run rather than once a quarter.

How do you use the budget once it’s built?

You use it in a monthly meeting where you compare actuals to budget, find the biggest gaps and agree on actions. Twenty minutes is enough if your books are closed on time.

A simple monthly routine:

Close the month in Xero within 10 business days.
Run the budget variance report.
Pick the three largest variances, good or bad.
Ask why each one happened: timing, price, volume or a one-off.
Agree on one action for each, with a name and a date beside it.
Update your rolling forecast so you know where the year will land.

This is where an outsourced finance team pays its way. Your bookkeeping team closes the month, and your virtual CFO runs the variance meeting with you and holds the business to its plan. Read more on how an outsourced finance team works.

Across our clients, the businesses that use their data for every decision outperformed others by around 400% (Simic Financial client analysis, results vary). A budget you review monthly is where that habit starts.

When should you get help with your budget?

Get help when the budget is driving big decisions: hiring, a new location, buying equipment, borrowing or preparing for a sale. At that point, the cost of a wrong assumption is far greater than the cost of advice.

Signs you would benefit from a CFO advisor:

You’ve built a budget before but stopped using it by the third month.
Revenue is growing but profit isn’t keeping up.
You can’t tell whether you can afford your next hire.
Your bank or a buyer has asked for a budget and forecast. See preparing your financials for a business loan.

Our clients have seen an average 29% lift in profit and 17% lift in cash flow (results vary). A good budget, used every month, is usually one of the first things we put in place.

Common questions

Should my budget include GST?

No, build your profit and loss budget excluding GST. GST is money you collect for the ATO, not revenue. It belongs in your cash flow forecast, where the BAS payment shows up as cash going out.

Should I budget for the financial year or the calendar year?

Most Australian businesses budget for the financial year, from July to June, because it lines up with tax and EOFY reporting. If you’re starting mid-year, build a rolling 12-month budget from next month. It’s better than waiting until July.

Who should prepare the budget: my bookkeeper, accountant or virtual CFO?

The owner should own the targets, with a virtual CFO or CFO advisor building the model and testing the assumptions. Your bookkeeper provides clean actuals to build from and compare against. Many tax accountants focus on compliance, so check that yours offers forward-looking advice before asking them.

What if we’re behind budget after the first few months?

Find out why before you change anything. If it’s timing, such as a big job slipping a month, leave the budget and watch the forecast. If it’s a real shift in demand or costs, update your forecast and act on costs or pricing, but keep the original budget so you can see what changed.

Want a budget you’ll actually use?

We build budgets with owners, load them into Xero and run the monthly review with you, so the plan turns into decisions. Book a free call to talk it through, or see our virtual CFO packages. If you’d like to start on your own, grab our free Excel template, Run your business with Complete Financial Clarity.

How to create a business budget you’ll actually use