How to create a small business budget

Published Wednesday 27 May 2026

Table of contents

• Why your business needs a budget
• The numbers that matter when setting a budget
• Creating your first small business budget
• Testing different scenarios
• How to track and monitor your budget
• Budget templates and tools to simplify the process
• Types of small business budgets
• Budget vs forecast: what’s the difference?
• Don’t be afraid to ask for help
• Simplify your small business budgeting with Xero
• FAQs on small business budgets

Key takeaways

• Build your budget by gathering 6 to 12 months of financial data, then separate your income into recurring and expected revenue and your expenses into fixed costs (like rent and insurance) and variable costs (like materials and commissions).
• Test different scenarios by adjusting for situations like revenue growth, client loss, or hiring decisions so you can see how changes affect your bottom line before they happen.
• Review your budget monthly by comparing actual figures against projections, and update it quarterly or whenever significant changes occur, such as winning a major contract or losing a key customer.
• Include a 10 to 20% safety margin in your budget to cover unexpected costs and seasonal dips, giving your business a financial buffer when it’s needed most.

Why your business needs a budget

A small business budget is a financial plan that maps your expected income against your expenses over a set period, helping you control spending and plan for growth. Without one, you’re making financial decisions based on guesswork rather than data.

Many small businesses operate without a formal budget. Research from Prospa found that 55% of Australian and New Zealand SMEs don’t have one, leaving them exposed to cash flow shortfalls and missed opportunities. A clear budget changes that by giving you a reliable picture of where your money goes and what you can afford.

A well-planned budget helps you:

• calculate your break-even point so you know exactly how many sales you need to cover costs
• plan reinvestment by identifying how much profit you can put back into growth
• time your hiring by seeing when cash flow supports bringing someone on
• reduce financial stress by replacing uncertainty with clear numbers you can act on
• prepare for opportunities by having the data ready when you need financing or want to expand

The numbers that matter when setting a budget

The key figures for budgeting come from your Profit and Loss (P&L) report and balance sheet. These two reports show your income, expenses, assets, and liabilities, giving you everything you need to build a budget.

The definition of a “small” entity often depends on official financial reporting thresholds. For example, New Zealand’s framework for small charities applies to those with total operating payments of less than $140,000.

Profit and Loss report

A Profit and Loss report (also called an income statement) shows whether your business is making money or losing it by subtracting expenses from income. To help you get started, download a free P&L template.

Income (revenue)

Your income is the money you generate from selling products or services. Break it into two categories:

• Recurring income: regular, reliable revenue from client retainers, subscriptions, and contract work
• Expected income: forecast revenue based on pipeline, seasonal patterns, or historical performance

Expenses (costs)

Your expenses are everything you spend to run the business. Their total amount can also determine your reporting requirements. For instance, one tier in New Zealand’s accounting standards applies to entities with total expenses of $5 million or less.

Expenses fall into two main categories:

Fixed costs

Fixed costs stay the same regardless of how much you sell. These predictable expenses form the baseline of your budget:

• Rent or lease payments
• Insurance premiums
• Salaried wages
• Software subscriptions
• Loan repayments

Variable costs

Variable costs change based on your business activity. They rise when sales increase and fall when business slows:

• Raw materials and inventory
• Sales commissions
• Shipping and delivery
• Hourly wages
• Marketing spend tied to campaigns

Other costs to capture

Some expenses are easy to overlook when budgeting:

• Depreciation: business assets like computers and equipment lose value over time and should be counted as a cost
• Overheads: energy costs (electricity, gas, fuel) that fluctuate but recur regularly
• Payroll extras: the full cost of employees includes insurance, taxes, and benefits beyond base salary

Revenue minus costs equals profit (or loss). A short-term loss can be part of growth, but profitability should be your goal.

When you make a profit, your budget helps you decide what to do with it:

• Reinvest in growth: put money back into the business to drive bigger returns
• Pay down debt faster: reduce interest costs and free up future cash flow
• Build a cash reserve: create a buffer for slow periods (especially important for seasonal businesses)

A financial adviser can help you choose the most tax-efficient approach.

Balance sheet

Beyond your P&L, a balance sheet shows what your business is worth by calculating the difference between what you own (assets) and what you owe (liabilities).

Assets include:

• business property and equipment
• cash in the bank
• unpaid invoices from customers (accounts receivable)

Liabilities include:

• unpaid bills to suppliers (accounts payable)
• taxes due in the near future
• outstanding loans and business debts

Assets minus liabilities equals your net worth. Get started with a free balance sheet template.

With your P&L and balance sheet figures in hand, you’re ready to create your budget. Visit the financial statement glossary if you need help with any accounting terms.

Creating your first small business budget

Creating your budget turns your financial data into a forward-looking plan. It shows how much you can spend, invest, and pay yourself while maintaining healthy cash flow.

Here’s how to build your budget in 8 steps:

1. Gather your financial data. Pull together P&L reports, balance sheets, and bank statements from the past 6 to 12 months. If your business is seasonal, make sure you capture a full cycle so your projections reflect quieter and busier periods.
2. List your income sources. Document all revenue streams, separating recurring income from one-off projects or seasonal sales. Look for patterns in when income arrives, as timing matters as much as the total amount.
3. Categorise your expenses. Break costs into fixed and variable categories, capturing everything from rent to office supplies. Don’t overlook irregular expenses like annual insurance renewals or equipment maintenance.
4. Choose your time frame. Decide whether to budget monthly, quarterly, or annually. Monthly works best for most small businesses starting out.
5. Project your future income. Use past performance to forecast realistic revenue for your budget period. Be conservative rather than optimistic, and factor in seasonal variation if your business has quiet months.
6. Allocate your expenses. Based on historical spending and business goals, assign amounts to each expense category. Build in a 10 to 20% safety margin to cover unexpected costs or revenue dips.
7. Calculate your expected profit. Subtract total projected expenses from projected income to see your bottom line. If the number is negative, look for expenses to cut or ways to increase revenue before the period begins.
8. Review and adjust. Check whether your budget aligns with your business goals and make adjustments where needed. Share it with a bookkeeper or accountant to get a second opinion on your assumptions.

Testing different scenarios

Scenario testing lets you see how changes affect your bottom line before they happen. Once you have a basic budget, start experimenting with the numbers to prepare for both opportunities and setbacks.

Try adjusting for situations like:

• Revenue growth: what if sales increase by 10% or 20%? Set SMART goals (specific, measurable, achievable, relevant, and time-bound) to turn these projections into targets you can track.
• Client loss: what happens if your biggest customer leaves? Knowing the impact ahead of time helps you plan a response.
• Cost reduction: how much would you save by negotiating lower rent or switching suppliers?
• Hiring decisions: can you afford to add an employee? Add payroll costs and see the impact. The guide to hiring employees covers what to budget for.
• Emergency fund: what if you need to cover 3 months of expenses at short notice? Building this scenario shows how much cash reserve you’d need.

Create multiple versions of your budget to compare different scenarios. This helps you set realistic targets and build contingency plans for unexpected changes.

How to track and monitor your budget

Budget tracking means comparing your actual income and expenses against your projections on a regular basis. Creating a budget is just the start. Regular monitoring helps you stay on course and catch problems early.

To keep your budget on track:

• Review monthly: compare actual figures against your budget at least once a month to spot variances
• Investigate differences: when spending exceeds budget in any category, find out why before it becomes a pattern
• Update projections: adjust your budget when circumstances change, such as winning a big contract or losing a supplier
• Watch cash flow: your budget should help you predict cash shortages before they happen, and a cash flow management guide can help with this
• Use software: accounting tools can automate tracking and show real-time performance against budget

Sticking to a budget takes discipline, but a few habits make it easier:

• Schedule a fixed time each month to review your numbers so it becomes routine
• Set spending limits for each category and check them before approving large purchases
• Share budget targets with your team so everyone understands the financial boundaries
• Flag variances early rather than waiting until the end of a quarter to address overspending
• Celebrate when you hit targets, as positive reinforcement keeps the habit going

Budget templates and tools to simplify the process

The right template or software makes budgeting faster and more accurate by eliminating manual data gathering and reducing errors.

Free budget template

Start with a spreadsheet template to organise your income and expenses. A good template includes:

• monthly income and expense tracking columns
• year-end summary calculations
• space for budget versus actual comparisons
• customisable categories for your business type

Accounting software

When you’re ready to automate, accounting software takes budgeting further. Xero accounting software automatically records income and expenses, so you don’t have to dig through records manually.

Software benefits for budgeting:

• Automatic categorisation: transactions are sorted as they come in
• Real-time reporting: see P&L and balance sheet figures instantly
• Visual dashboards: graphs and charts make trends easy to spot
• Bank integration: connect your accounts for up-to-date figures
• Reduced errors: automation means less manual data entry mistakes

Types of small business budgets

Different types of budgets serve different purposes, and choosing the right one depends on what your business needs to track. Here are 4 common approaches.

Operating budget

An operating budget covers your day-to-day income and expenses over a set period, usually a year. It’s the most common type for small businesses because it gives you a clear picture of whether your regular operations are profitable. Most of the steps in this guide focus on building an operating budget.

Cash flow budget

A cash flow budget tracks when money comes in and goes out, rather than just the totals. This is especially useful if your business has gaps between invoicing and receiving payment. A cash flow forecasting guide can help you build one alongside your main budget.

Capital expenditure budget

A capital expenditure budget plans for large, one-off purchases like equipment, vehicles, or property. These costs don’t fit neatly into your operating budget because they’re infrequent and often funded through loans or savings. Tracking them separately helps you plan major investments without distorting your day-to-day figures.

Zero-based budget

A zero-based budget starts from scratch each period, requiring you to justify every expense rather than basing it on what you spent last time. It takes more effort, but it’s effective for identifying unnecessary spending. This approach works well for businesses looking to tighten costs or redirect funds toward growth.

Budget vs forecast: what’s the difference?

A budget and a forecast are related but serve different purposes. Understanding the distinction helps you use both effectively.

A budget is a fixed financial plan for a set period. It sets targets for income and expenses and acts as a benchmark you measure performance against. You typically create it once (annually or quarterly) and use it as a reference point throughout that period.

A forecast is a regularly updated prediction of what’s likely to happen based on current conditions. Unlike a budget, a forecast changes as new information comes in. If sales are trending higher or a major expense appears, your forecast adjusts to reflect reality.

In practice, you need both. Your budget tells you where you planned to be, while your forecast tells you where you’re actually heading. Comparing the two highlights whether you’re on track or need to make changes. For more on forward-looking financial planning, see the guide to cash flow forecasting.

Don’t be afraid to ask for help

Getting professional help with your budget can be a worthwhile investment. A bookkeeper or accountant brings expertise you might not have, and their input can save you from costly mistakes.

They can help you:

• double-check your numbers for accuracy
• make realistic growth and expense predictions
• plan for tax obligations
• adjust when actual results differ from your budget

An expert can review your budget and confirm it makes sense for your business goals. If you’re unsure where to start, even a one-off consultation can point you in the right direction.

Simplify your small business budgeting with Xero

A budget gives you confidence to make strategic decisions. You’ll know exactly what you can afford, where to cut costs, and when to invest in growth.

Xero accounting software makes budgeting straightforward by automatically tracking your income and expenses, generating real-time reports, and showing your financial position at a glance. You can compare your budget against actual figures without manually updating spreadsheets, and see trends through visual dashboards.

Explore all the tools available with Xero accounting software, or try it free for one month. Get one month free.

FAQs on small business budgets

Here are answers to frequently asked questions about small business budgets.

What’s the 50/30/20 rule for business budgets?

The 50/30/20 rule allocates 50% of income to essential operating costs, 30% to growth investments, and 20% to savings or debt repayment. While originally designed for personal finance, small businesses can adapt it as a starting framework. Adjust the ratios to fit your industry and growth stage.

How often should I update my small business budget?

Review your budget monthly to compare actual figures against projections. Update the budget itself quarterly, or whenever significant changes occur like winning a major contract or losing a key customer. Regular reviews help you catch problems early and adjust before small variances become big ones.

What if my actual spending doesn’t match my budget?

Variances between your budget and actual spending are normal, especially in the early months. Investigate why the difference occurred, then decide whether to adjust your spending or update your budget to reflect reality. Consistent overspending in one category signals a need for action rather than just a budget adjustment.

Should I use budgeting software or a spreadsheet?

Start with a spreadsheet if you’re new to budgeting. Move to accounting software when you want automatic transaction tracking, real-time reporting, and less manual data entry. Software typically pays for itself in time saved as your business grows and transactions increase.

How much of my revenue should go towards a safety margin?

Set aside 10 to 20% of projected revenue as a safety margin to cover unexpected costs or revenue shortfalls. The exact percentage depends on how predictable your income is. Seasonal businesses or those with irregular cash flow should aim for the higher end of that range.