Key Takeaways
- A cash flow forecast estimates how much money will enter and leave your business over a future period.
- Start with your actual bank balance, expected customer payments, operating expenses, and upcoming financial commitments.
- Forecast cash receipts based on when customers are likely to pay, not simply when you issue invoices.
- Include Australian tax obligations, GST, PAYG withholding, employee superannuation and loan repayments where applicable.
- Use realistic estimates and account for seasonal changes, unexpected costs, and delayed payments.
- Update your forecast regularly and compare actual results with your original estimates.
- Use the forecast to identify cash shortages early, improve payment collection, and make better decisions about spending and growth.
Main Text Content
What Is a Cash Flow Forecast?
A cash flow forecast is a financial planning tool that estimates how much money your business expects to receive and pay over a specific period. It helps you understand whether your available cash will be sufficient to cover upcoming expenses and commitments.
Unlike a profit and loss statement, which measures income earned and expenses incurred, a cash flow forecast focuses on the timing of actual cash movements.
For example, an Australian consulting business might issue a $15,000 invoice in October but give its customer 30 days to pay. The business may record the revenue in October, depending on its accounting method, but the money may not arrive until November. If rent, wages and supplier bills are due in October, the business could experience a cash shortage despite making a profitable sale.
A cash flow forecast makes this timing difference visible.
According to the Australian Government’s business guidance, forecasting helps businesses predict potential shortages and surpluses, plan payments and make better financial decisions. business.gov.au
Why Is Cash Flow Forecasting Important?
Cash flow forecasting is useful for businesses of different sizes and industries, from sole traders and consultants to retailers, trades businesses and growing companies with employees.
1. Identify Cash Shortages Before They Happen
One of the main benefits of forecasting is the ability to identify periods when expenses may exceed available cash.
For example, you may discover that several customer invoices are not expected to be paid until the same week your rent, supplier invoices and tax obligations fall due. Knowing this in advance gives you time to follow up on outstanding payments, negotiate payment arrangements where appropriate, or delay non-essential spending.
Without a forecast, these issues may only become apparent when the bank balance is already low.
2. Plan for Tax and Other Financial Obligations
Australian businesses may need to manage GST, PAYG withholding, income tax, superannuation contributions and other obligations, depending on their structure and circumstances.
These payments can place pressure on cash flow when businesses fail to set money aside throughout the year. A forecast helps you estimate when these amounts will need to be paid and planned accordingly.
The Australian Taxation Office provides guidance on BAS lodgment and payment dates. Always check your own reporting requirements and the due dates shown on your activity statement.
3. Make Better Business Decisions
Business owners regularly make decisions about hiring employees, buying equipment, expanding operations, increasing marketing expenditure, or taking on larger projects.
These decisions may appear affordable based on projected sales or accounting profits. However, they can create financial pressure if the required cash is not available when payments fall due.
A cash flow forecast helps you assess whether your business can afford a planned expense while still meeting its existing commitments.
4. Prepare for Seasonal Changes
Some Australian businesses experience predictable fluctuations in demand. Retailers may generate more sales during holiday periods, while trades businesses may experience changes in activity due to weather, project schedules or customer demand.
A forecast allows you to prepare quieter periods by building reserves during stronger months and adjusting spending before revenue declines.
5. Understand Whether You Need Additional Funding
If your forecast shows that cash may fall below the amount needed to operate comfortably, you can investigate possible solutions before the shortage occurs.
Depending on your circumstances, this might involve improving payment collection, reducing unnecessary expenses, adjusting stock purchases, or discussing suitable funding options with a financial professional.
Borrowing is not always the best solution. Forecasting helps you understand the size, timing and likely cause of a shortfall before committing additional debt.
Step 1: Choose Your Forecasting Period
Start by deciding how far ahead you want to forecast.
For many small businesses, a rolling 12-month forecast is useful because it captures seasonal changes, major annual expenses, and longer-term financial commitments. You can also use a shorter weekly forecast when cash flow is tight, or payment timing is unpredictable.
Consider the following approaches:
- Weekly forecast: Useful for businesses with limited cash reserves, frequent transactions or irregular customer payments.
- Monthly forecast: Suitable for many small and medium-sized businesses that want to plan operating expenses and monitor performance.
- 12-month forecast: Helpful for understanding seasonal patterns, annual obligations and planned growth.
You do not need complicated software to get started. A spreadsheet can be sufficient, provided the figures are organised clearly and updated consistently. The Australian Government also provides a cash flow statement template that can help you structure your forecast.
Step 2: Calculate Your Opening Cash Balance
Your opening cash balance is the amount of cash available to the business at the beginning of the forecasting period.
Start with your current bank balance and reconcile it against transactions that have already occurred but may not yet appear in your records.
Depending on your circumstances, you may need to account for outstanding payments, unclear transactions, and money held in separate business accounts.
Be careful not to count money twice. An invoice that has already been paid should also not appear as an expected future receipt.
You should also distinguish between total bank funds and money genuinely available for general business spending. For example, part of your balance may be needed to cover GST collected, payroll obligations, or other upcoming commitments.
A business can have a healthy-looking bank balance while having less cash available than expected once these obligations are considered.
Step 3: Estimate Your Expected Cash Inflows
The next step is to estimate when money will enter your business.
Cash inflows may include:
- Payments from customers.
- Cash and card sales.
- Payments from online stores or booking platforms.
- Recurring subscription or retainer income.
- Deposits and milestone payments.
- Business grants or rebates that are reasonably expected.
- Loan proceeds or capital contributions, where applicable.
- Refunds or other incoming payments.
Use your accounting records, bank statements, sales reports and accounts receivable list to develop realistic estimates.
Forecast Customer Payments, Not Just Sales
One of the most common forecasting mistakes is assuming that revenue and cash receipts occur at the same time.
If you issue an invoice in October with payment terms of 30 days, estimate when the customer is likely to pay based on their payment history and agreed terms. Do not automatically assume the money will arrive in October.
For existing customers, review previous payment patterns. If a customer regularly pays late, build that delay into your forecast rather than relying solely on the invoice due date.
For new sales, use reasonable assumptions based on your sales pipeline, historical conversion rates, and expected payment timing. Separate confirmed income from uncertain opportunities so that your forecast does not rely too heavily on sales that may not eventuate.
For businesses with seasonal demand, compare your estimates with previous years where reliable records are available.
Step 4: List Your Expected Cash Outflows
After estimating incoming cash, identify the payments your business expects to make.
Common cash outflows include:
- Wages, salaries, and related employment costs.
- Superannuation contributions.
- Rent, utilities, and insurance.
- Inventory, materials, and supplier invoices.
- Software subscriptions and professional fees.
- Advertising and marketing expenses.
- Equipment purchases and maintenance.
- Loan principal and interest repayments.
- Business insurance premiums and licence renewals.
- GST, PAYG withholding, income tax and other applicable tax payments.
- Owner drawings or distributions, where relevant to the business structure.
Record the expected payment date as accurately as possible. A supplier invoice due on the fifth of the month can create a different cash flow outcome from an invoice due at the end of the month, even if the amounts are identical.
Separate recurring expenses from one-off costs. Recurring expenses may be easier to estimate, while equipment purchases, annual insurance premiums, and major repairs may require individual planning.
Remember that a cash flow forecast records when money is paid. For example, buying equipment may require a large cash payment upfront even if the accounting treatment spreads its expense over several years.
Step 5: Include Australian Tax and Superannuation Obligations
Tax obligations deserve particular attention because the money collected or earned by your business may not all be available for everyday spending.
Depending on your circumstances, consider the following.
Goods and Services Tax (GST)
If your business is registered for GST, track the GST collected on sales and the GST credits that may be available on eligible business purchases. Forecast the expected net payment or refund and the relevant reporting period.
Avoid treating all GST-inclusive sales receipts as money available for general expenses. Some of the cash received may need to be paid to the ATO.
The ATO’s GST guidance explains how GST accounting and payment arrangements relate to business cash flow.
PAYG Withholding
If your business employs staff, it may need to withhold tax from employee payments and report and pay those amounts to the ATO. Include the expected payment dates in your forecast.
Income Tax
Set aside funds for anticipated income tax liabilities based on your business structure and expected taxable income. The timing and number of payments may vary, so use your circumstances and professional advice rather than relying on a generic percentage.
Superannuation
Include expected superannuation contributions as a separate cash outflow. Employee superannuation is a business obligation, not optional spare cash.
Other Applicable Obligations
Depending on your business, you may also need to plan payroll tax, workers’ compensation insurance, license fees and other statutory payments.
The Australian Government’s guide to managing cash flow recommends planning for taxes, employee costs and other obligations rather than waiting until payments become due.
Step 6: Build Your Cash Flow Forecast
Once you have gathered your information, organise it into a spreadsheet with one column for each week or month and rows for your main cash inflows and outflows.
A simple forecast can use the following structure:
| Cash flow item | October | November | December |
| Opening cash balance | $20,000 | $22,000 | $18,000 |
| Customer receipts | $30,000 | $28,000 | $35,000 |
| Other cash inflows | $0 | $2,000 | $0 |
| Total cash available | $50,000 | $52,000 | $53,000 |
| Operating expenses | $18,000 | $19,000 | $20,000 |
| Wages and related costs | $8,000 | $8,000 | $8,000 |
| Tax and other obligations | $2,000 | $5,000 | $4,000 |
| Equipment and loan payments | $0 | $2,000 | $1,000 |
| Total cash outflows | $28,000 | $34,000 | $33,000 |
| Closing cash balance | $22,000 | $18,000 | $20,000 |
Illustrative examples only. Figures are hypothetical and do not represent a typical Australian business or a tax calculation.
In this example, October’s closing balance becomes November’s opening balance, and November’s closing balance becomes December’s opening balance.
The basic calculation is:
Closing cash balance = Opening cash balance + Cash inflows − Cash outflows
This is the central calculation behind a cash flow forecast.
A spreadsheet can automate the calculation, reducing the risk of manual errors. Keep the categories consistent from month to month so you can compare results and identify patterns.
Step 7: Create Realistic, Optimistic and Conservative Scenarios
A forecast is only as useful as the assumptions behind it. Business conditions can change, and expected income may not arrive on schedule.
Instead of relying on a single prediction, consider creating three scenarios.
Realistic Scenario
This reflects your best estimate based on current information, existing customers, likely sales, and expected expenses.
Conservative Scenario
This assumes conditions are less favourable. For example, sales may be lower than expected, customers may pay later, supplier costs may rise or an unexpected expense may occur.
Optimistic Scenario
This assumes stronger sales or faster customer payments, while still using reasonable assumptions.
Comparing these scenarios helps you understand how resilient your business may be if circumstances change.
For example, if your conservative forecast shows that cash could fall below the amount needed to pay wages and suppliers, you may decide to delay a discretionary purchase, increase your cash reserve or improve collection processes before the problem develops.
Do not treat an optimistic forecast as guaranteed money. Make important commitments based on a level of cash flow your business can reasonably support.
Step 8: Identify Your Minimum Cash Requirement
Your forecast should help you understand not only whether your cash balance will remain positive, but also whether it will remain sufficient for your business to operate comfortably.
A positive bank balance does not automatically mean you have enough cash available. You may still have supplier invoices, wages, tax payments, and loan repayments due shortly afterwards.
Estimate a minimum operating cash buffer based on your business’s regular commitments, payment cycles and exposure to unexpected costs.
There is no single reserve amount that suits every business. A service business with recurring monthly clients may have different cash requirements from a retailer that needs to purchase inventory well before receiving sales revenue.
Use your forecast to determine how much cash you need to cover expected obligations and absorb reasonable disruptions.
Step 9: Compare Forecast Results With Actual Results
A cash flow forecast should be a working document, not something you create once and leave untouched.
At the end of each week or month, compare your forecast with what actually happened.
Ask questions such as:
- Did customers pay when expected?
- Were sales higher or lower than in the forecast?
- Did operating expenses increase?
- Were there unexpected payments?
- Did tax obligations match your estimates?
- Is the closing bank balance consistent with your records?
If the forecast differs from actual results, investigate why.
For example, lower-than-expected cash receipts may indicate slower customer payments, reduced sales, or a forecasting assumption that needs to change. Higher expenses may reflect increased supplier prices, additional labour or costs that were not originally included.
Use what you learn to update the remaining forecast periods. This rolling approach keeps your forecast relevant as business conditions change.
Step 10: Take Action When a Shortfall Appears
The greatest value of forecasting comes from the decisions you make in response to what it reveals.
If your forecast identifies a possible shortage, investigate the cause before deciding how to respond.
Improve Payment Collection
Review overdue invoices, follow up with customers and make payment terms clear. Where appropriate, consider deposits, milestone billing or progress payments to reduce the time between delivering work and receiving money.
Review Business Expenses
Identify discretionary expenses that could be delayed or reduced without harming essential operations. Avoid cutting costs that are necessary to deliver your products or services safely and effectively.
Manage Inventory and Purchasing
Businesses that hold stock should review purchasing schedules and inventory levels. Excess inventory ties up cash that could otherwise be used to pay expenses.
Review Pricing and Profit Margins
If revenue is increasing but cash remains under pressure, assess whether your prices cover the full cost of delivering your products or services. Consider material costs, labour, overheads and payment fees when reviewing profitability.
Consider Funding Carefully
If a shortfall cannot be addressed through operational changes, investigate suitable funding options. Compare interest rates, fees, repayment schedules and the effect of repayments on future cash flow before committing.
If you expect difficulty meeting tax obligations, contact the ATO or your registered tax or BAS agent promptly to discuss your circumstances and available options. Do not assume a payment extension or arrangement will be approved automatically.
The Australian Government provides further practical suggestions in its guide to improving business cash flow.
Common Cash Flow Forecasting Mistakes to Avoid
Even a straightforward forecast can become unreliable if important details are overlooked.
Overestimating Sales
Do not assume every sales opportunity will become a paying customer. Use historical performance and realistic expectations, and separate confirmed revenue from uncertain prospects.
Ignoring Late Payments
An invoice is not the same as cash in the bank. Estimate receipts based on realistic payment timing, including delays that occur regularly.
Forgetting Irregular Expenses
Annual insurance premiums, equipment replacement, professional fees, repairs and licence renewals can create significant cash outflows. Add these costs to the forecast when they are expected to occur.
Spending Money Reserved for Tax
Cash held in the business account may include amounts needed for GST, PAYG withholding or other obligations. Track these commitments separately so they are not mistaken for surplus funds.
Confusing Profit With Cash Flow
A profitable business can still struggle to pay bills if customers pay slowly, inventory absorbs cash or debt repayments are high. Monitor cash flow alongside your profit and loss statement and balance sheet.
Failing to Update the Forecast
Business circumstances change. A forecast based on outdated assumptions may create a false sense of security. Review it regularly and revise your estimates when new information becomes available.
How Sunnyside Financial Group Can Help
Building a cash flow forecast is more than filling in a spreadsheet. The real value comes from understanding what the numbers mean, identifying risks early, and using the information to make better business decisions.
Sunnyside Financial Group can help Australian businesses make tax, cash flow and profitability simpler through accounting, tax planning, financial reporting and broader business advisory support.
With a clearer understanding of expected income, operating costs, tax obligations and upcoming financial commitments, business owners can make more informed decisions about spending, pricing, staffing, and growth.
Professional support can also help you review the assumptions behind your forecast, understand why actual results differ from expectations, and identify opportunities to strengthen your financial position.
Final Thoughts
A cash flow forecast gives Australian business owners a clearer view of the money expected to enter and leave their business. It helps identify potential shortages, prepare for tax payments, manage operating costs and assess whether planned investments are financially realistic.
You do not need a complex financial model to get started. Begin with your current cash balance, estimate when customers will pay, list your expected expenses and calculate your closing balance for each period. Then compare your estimates with actual results and update the forecast as circumstances change.
The most important step is to use the forecast consistently. By looking ahead instead of relying only on the current bank balance, you can spot problems earlier, prepare for uncertainty and make decisions with greater confidence.
Disclaimer: This article provides general information only and does not constitute financial, accounting, tax or legal advice. Business circumstances and tax obligations vary. Consult a suitably qualified professional for advice specific to your business.
