Most Australian SME owners operate without a budget — and it shows. Without a budget, you're guessing whether you can afford to hire, invest in marketing, or buy equipment. A practical budget takes 2–3 hours to build and saves you from costly surprises all year. Here's how to do it in 2026.
1. Start with Last Year's Actuals
Don't build a budget from scratch. Export your last 12 months of P&L data from Xero and use it as a baseline. Then adjust for known changes:
- Revenue: Are you expecting growth, stability, or contraction? Be conservative — budget 80% of your optimistic forecast.
- Wages: Factor in 1 July pay increases, new hires, and super rate changes (12.5% from July 2026).
- Rent: Check your lease for annual CPI increases.
- Insurance: Premiums typically increase 5–15% annually. Get renewal quotes early.
- New costs: Software, equipment, marketing campaigns, or contractors you plan to engage.
2. Fixed vs Variable Costs
| Fixed Costs (Same Every Month) | Variable Costs (Change with Revenue) |
|---|---|
| Rent, insurance, loan repayments | Materials, stock, commissions |
| Software subscriptions | Freight and delivery costs |
| Base wages (permanent staff) | Casual wages, subcontractor costs |
| ASIC fees, licences | Marketing spend (if performance-based) |
Knowing your fixed costs tells you your breakeven point — the minimum revenue needed each month just to survive.
3. Building the Budget in Xero
- Go to Accounting → Budgets → Add Budget.
- Import your prior year actuals as a starting point.
- Adjust each line item month-by-month for seasonal variations.
- Set up Budget vs Actual reports to track performance monthly.
- Review and update your budget quarterly — it's a living document, not a set-and-forget exercise.
4. The Monthly Review
Every month, compare your actuals against the budget. Ask three questions:
- Revenue on track? If you're 10%+ below budget, investigate immediately — don't wait until quarter-end.
- Any expenses blowing out? Identify categories where you're consistently over budget and take corrective action.
- Cash flow implications? Even if you're on budget for profit, check that the timing of receipts and payments isn't creating cash gaps.
5. Common Budgeting Mistakes
- Being too optimistic on revenue — hope is not a strategy. Use conservative estimates.
- Forgetting lumpy expenses: Annual insurance, WorkCover, ASIC fees, and BAS payments. Spread them monthly in your budget.
- Not budgeting for tax: Include your estimated income tax and GST payments as line items.
- Setting and forgetting: A budget you don't review monthly is useless. Schedule 30 minutes each month.
Key Takeaways
- Start with last year's actuals and adjust for known changes.
- Know your fixed costs to calculate your monthly breakeven point.
- Build your budget in Xero and run Budget vs Actual reports monthly.
- Be conservative on revenue and don't forget annual lumpy expenses.
- Review and update quarterly — a budget is a living document.