Preparing a cash flow forecast: how do they work?

What is a cash flow forecast?

A cash flow forecast is an essential financial tool that estimates how much money is expected to come into and leave a business over a specific period of time.

Unlike a profit and loss statement, which measures overall financial performance by recording revenue and expenses when they are billed or incurred, a cash flow projection focuses on when money is received and paid, providing a forward-looking view of liquidity.

Why is a cash flow forecast important?

Cash flow can make or break a business. Even profitable firms can face challenges if cash isn't available when it's needed most. By mapping future cash movements, forecasting helps to identify potential shortfalls and surpluses, supporting more effective budgeting, investment planning and financial management.

For example, consider a manufacturer supplying products to large retailers. While orders may be strong, customer payment terms of 60 or 90 days can mean payment is received long after goods have been delivered. By identifying these timing differences well in advance, a cash flow forecast helps firms plan expenditure, manage production schedules and assess whether additional funding may be needed. This proactive approach to managing finances supports both operational stability and growth.

Advantages of a cash flow forecast

Effective cash flow management and forecasting has many advantages, helping businesses to:

Attract more funding

A detailed business cash flow forecast gives lenders and investors confidence that a firm understands its finances and funding needs. By providing a clear view of income, operational performance and repayment capacity, it can strengthen finance applications and, in some cases, help secure more favourable lending terms and higher credit limits.

Plan investments better

Greater visibility over future cash positions supports smarter investment decisions by identifying when surplus cash is likely to be available and whether planned investments are financially sustainable. This means firms can invest with greater confidence, allocating capital at the right time to support growth without compromising day-to-day operations.

Track your spending

Forecasting affords a dynamic view of cash position, enabling companies to track incoming payments, manage outgoing costs and maintain control over spending. Comparing forecasted and actual cash movements can highlight cost overruns, improve budgeting accuracy and support more effective financial management.

Foresee cash shortages

Many businesses experience a delay between delivering goods or services and receiving payment. A cash flow forecast acts as an early warning system, identifying potential cash shortages in advance and allowing companies to take proactive action before they affect payroll, supplier payments or other critical financial commitments.

Create a simple cash flow forecast in 4 steps

Creating a simple cash flow forecast doesn’t have to be complicated and can be broken down into a few key steps:

Choose the period to plan for

Choose a forecast period that aligns with your business goals, covering both immediate cash flow needs and future planning. The forecast period should cover the entire cash flow cycle, helping to identify potential risks, anticipate pressure points and prepare for fluctuations in income and expenditure.

• Short-term (1-3 months)
  • Best for: Tight cash management, start-ups and responding to immediate cash pressures
• Medium-term (6-12 months)
  • Best for: Managing seasonality, budgeting and operational planning
• Long-term (12-36 months)
  • Best for: Strategic growth, investment decisions, and securing external finance

Calculate all your income

Begin by estimating all expected inflows during the forecast period. This may include:

• Customer payments
• Recurring revenue
• Grants and funding facilities
• Asset sales
• Tax refunds
• Other sources of income

Using realistic assumptions based on historical performance helps improve forecasting accuracy.

List all your business outgoings

Record all expected cash outflows and when they are due, including:

• Payroll and employee costs
• Supplier payments
• Rent and utilities
• Tax liabilities
• Loan repayments
• Equipment purchases and planned investments

It's important to factor in payment timings, as cash often leaves accounts before related revenue is received.

Calculate your running cash flow

Subtract your projected outgoings from expected income for each forecast period and add the result to your opening cash balance. This running total provides a clear view of future cash availability, highlighting potential shortfalls, surpluses and funding requirements, before they arise.

Turning insight into action

The true value of forecasting lies not in predicting the future with complete accuracy, but in helping to prepare for it. By building a clearer picture of what lies ahead, firms can make decisions with greater certainty, remain agile in changing conditions and build a stronger foundation for growth.

At Close Brothers, we recognise that maintaining healthy cash flow requires both visibility and flexibility. Where cash is tied up in unpaid invoices, invoice finance can form part of a wider working capital strategy, providing access to earned income sooner and helping businesses maintain the consistency needed to plan and forecast with confidence.