A cash flow forecast estimates the money you expect to receive and pay out over a future period, so you can see whether your business will have enough cash to meet its commitments. For new UK limited companies, it’s one of the simplest ways to spot shortfalls early, plan tax and supplier payments, and make calmer decisions about hiring, business purchases, or investment.
Key takeaways
A cash flow forecast is forward-looking. It shows when cash is likely to enter and leave your bank account, not just whether your business looks profitable on paper.
It matters because companies can trade profitably and still run into cash trouble if customer payments arrive late or large bills land before income does.
For most first-time founders, the best place to start is a simple, direct forecast in a spreadsheet, updated at least monthly and more often when cash is tight.
GOV.UK reports that not having enough cash is one of the most significant reasons why companies fail, even when they are otherwise trading effectively. British Business Bank notes that even a profitable business can run into short-term cash pressure while it waits to be paid.
That’s why cash flow forecasting matters so much for a newly incorporated limited company. You may only be a few invoices in, but you already need to think about rent, software, wages, supplier bills, and future tax payments. A forecast gives you an early warning system before those obligations become a problem.
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What cash flow forecasting means
A cash flow forecast is a plan for the money you expect your business to receive and pay out over a set period of time. In plain English, it helps you answer one question: Will there be enough cash in the bank when bills fall due? It’s a plan showing how much money you expect to receive and pay out – cash flow forecasting can be described as estimating the size and timing of upcoming transactions and what they do to your cash position.
This is slightly different from general “financial forecasting”. A cash flow forecast focuses on liquidity. It is about timing and bank balance, not just revenue growth or profit margins. That distinction matters for new directors because your company can look busy and successful while still running short of spendable cash.
Cash flow forecast vs cash flow statement
A cash flow forecast looks ahead. It predicts future inflows and outflows. A cash flow statement looks back. It records the cash that actually moved through the business during a completed period. Xero’s template guidance explains that the forecast helps you plan ahead, while the statement provides a historical record of past cash movements. IAS 7 (International Accounting Standards) likewise defines the statement of cash flows as reporting how cash and cash equivalents changed during the period.
For a new limited company, that difference is practical. Your annual accounts and Company Tax Return are statutory obligations, with Companies House and HMRC deadlines after your year-end. A cash flow forecast is not a filing requirement. It is an internal management tool that helps you prepare for those obligations before they bite.
Cash flow forecast vs budget
A budget is a plan. A forecast is a prediction. Xero’s forecasting guidance puts it neatly: a budget sets financial targets for a period, while a cash flow forecast predicts the actual money likely to come in and leave your bank accounts. In practice, your budget says what you want to happen; your cash flow forecast shows what is likely to happen if payment timing, costs, and trading conditions unfold the way you currently expect.
Why cash flow forecasts matter for your business
The simplest reason is survival. If you can see a cash gap six weeks before it happens, you still have options. You can chase overdue invoices, delay a non-essential purchase, negotiate supplier terms, or arrange short-term funding. If you only discover the gap when payroll or VAT is due, your choices are far worse. The British Business Bank says a forecast gives you clarity about the likely future state of the business, so you can make decisions before they become critical.
It also protects you from the classic founder mistake of confusing profit with cash. A business can incur costs when delivering work while still waiting for the customer to pay. That’s exactly how profitable firms get squeezed. Research from the Department for Business and Trade suggests micro business cash flows are often highly dependent on timely payments from their business customers. Forecasting forces you to map timing, not just totals.
For UK limited companies, there is another layer. Your company will face recurring filing and tax obligations, including annual accounts, Corporation Tax, and a Company Tax Return. If the company is VAT-registered, it must ensure it includes its quarterly VAT payment in the forecast. Inflows and outflows should be forecasted including VAT, but also ensure the VAT payment is included in the forecast.
GOV.UK says that:
- Annual accounts are generally due nine months after the financial year end.
- Corporation Tax is due nine months and one day after the accounting period ends.
- Company Tax Return is due 12 months after the accounting period ends.
If you do not build these dates into your forecast, they can feel like one-off shocks even though they are entirely predictable.
Specifically on the forecasting side, you should take their forecasted profits for the financial year and multiply it by your tax rate and put this in your cashflow forecast for 9 months after the year end. As the year progresses, update the expected CT payment in your cash flow forecast according to your performance against the profit expectation. If more profitable, increase the payment, if less, reduce it.
Forecasting also matters when you want finance. Applicants must provide a 12-month cash flow forecast as part of the supporting documents. Lenders often require cash flow forecasts, usually covering the next 12 months, for applications and monitoring.
Before you can forecast your cash flow, you’ll need a business bank account. Read our guide to the best business bank accounts for new limited companies.
What goes into a forecast, and how far ahead to look
A basic cash flow forecast is built from five moving parts. ACCA’s example template and Xero’s guidance both revolve around the same structure: an opening balance, money in, money out, a net movement, and the closing balance that rolls into the next period.
Opening balance: the actual cash you have at the start of the period, based on your real bank and cash balances. All figures entered should be actual cash, including bank payments and receipts, transfers, and cash on hand.
Cash inflows: money you expect to receive, such as sales receipts, loans, grants, and other business income. Business.gov.uk lists sales, grants, loans, and other business income as core inputs.
Cash outflows: money you expect to pay, such as materials, rent, utilities, tax, wages, and advertising. Business.gov.uk uses those categories as examples of forecast expenses.
Closing balance: opening cash plus inflows minus outflows. Xero’s rolling forecast guide uses this same formula and then carries the closing balance into the next period.
If you are wondering how far ahead to forecast, use the horizon that matches the decision you’re trying to make. For a first-time founder, the most useful rhythm is usually a short rolling forecast for control and a longer monthly view for planning. The table below reflects common practice in small business guidance.
Cash flow forecasting guide
| Forecast type | Period covered | Best use | Trade-off |
|---|---|---|---|
| Short-term | Up to 13 weeks | Day-to-day liquidity, payroll, supplier bills, and spotting shortfalls early | Most useful operationally, but narrower in scope |
| Medium-term | Three to 12 months | Tax planning, seasonal trading, hiring, marketing spend, and routine investment | Less precise than a 13-week view |
| Long-term | 12 months or more | Expansion, funding discussions, larger projects, and strategic planning | Accuracy naturally falls the further you look ahead |
If you are just starting out, a 12-month forecast is sensible because it covers a full trading cycle, and Business.gov.uk says a cash flow forecast for funding preparation should cover the next 12 months. Pairing that with a shorter rolling 13-week view gives you better control over immediate cash timing.
How to make a cash flow forecast
You do not need fancy software to begin – a spreadsheet is fine. What matters is that the forecast is grounded in real payment timing and updated consistently. That is the thread running through guidance from the British Business Bank, ACCA, Xero, and Business.gov.uk.
Choose your time frame and layout
Start with either a rolling 13-week weekly forecast or a 12-month monthly forecast. Xero says up to 13 weeks works well for day-to-day cash management, while Business.gov.uk recommends a 12-month cash flow forecast for funding preparation. Keep one column per week or month, and one row for each money-in or money-out category.
Set your opening balance from the real bank balance
Do not guess. Use the actual cash currently in the bank, and make sure your bookkeeping is up to date first. Xero’s rolling forecast guidance says to begin with your current cash position and reconcile your books before forecasting. The starting point should be actual cash, including bank, loan, and cash balances.
List cash coming in by expected payment date
This is where many founders go wrong. Forecast cash when you expect the money to arrive, not when you issue the invoice. Business.gov.uk explicitly says your figures should reflect your bank account, and you should think about when customers pay, not when you bill them. Income belongs in the cash flow forecast when you expect it to be paid, which may be after the invoice date or, for deposits, before it. Include any non-sales cash, too, such as loans or grants.
List cash going out by expected payment date
Add your regular operating costs first, then the irregular items that founders often forget. Business.gov.uk highlights materials, rent, utilities, tax, wages, and advertising. Some costs are paid in the same month, others in arrears. It also notes that non-cash costs, such as depreciation, should be left out of the cash flow forecast.
Calculate net cash flow and closing balance
For each period, subtract total cash outflows from total cash inflows. Then apply the basic formula: closing cash balance = opening cash + cash inflows – cash outflows. Carry that closing balance into the next period as the new opening balance. Xero uses this model in its rolling cash flow guide, and its UK cash flow software guidance describes net cash flow in the same way.
Replace estimates with actuals and roll the forecast forward
Once a week or month ends, swap your estimate for the actual figure, then add a new week or month at the far end. Update weekly for a 13-week forecast by replacing estimates with actuals and adding a new week. Its rolling forecast guidance says monthly updates are usually enough in normal conditions, but weekly updates are better when cash is tight or the business is changing quickly.
Stress-test the numbers before you trust them
A forecast should not only show your “most likely” outcome. Use baseline, best-case, and worst-case scenarios, and highlight variables such as sales, supplier costs, payroll, capex timing, tax payments, and financing terms. That kind of stress test is especially useful when you are a new company without much trading history.
If your business is brand new and you have no historical data, build the forecast from what you do know: fixed costs, realistic market research, likely payment terms, and a cautious sales estimate. Forecasts should be based on performance so far, or what you can safely predict from market research, and should allow room for seasonal or market-driven change.
Choosing the right method and avoiding mistakes
When people talk about direct and indirect cash flow forecasting, they are really talking about two different ways of modelling cash.
The direct method lists expected cash receipts and cash payments. ICAEW describes it as reporting categories of cash receipts and cash payments, and ACCA calls it intuitive because it starts with cash received from customers and deducts cash paid to suppliers, wages, other operating expenses, tax, and similar outflows.
The indirect method starts from profit and adjusts for non-cash items and working capital movements. It works by adjusting profit or loss for non-cash transactions and changes in working capital.
For a newly incorporated small business, a direct-style forecast is usually the right starting point. That is an inference from the guidance above: it is easier to understand, it matches how cash hits the bank, and ACCA’s example template is built around actual cash balances and actual cash receipts and payments. Use the direct method where possible because the indirect method is less easily understood, even though it can still be a useful control.
Some of the biggest forecasting mistakes that people tend to make are:
Using invoice dates instead of payment dates. Business.gov.uk says your forecast should reflect your bank account, not the date you issue invoices. Income should be entered when you expect it to be paid.
Forgetting irregular costs. Tax, annual renewals, insurance, loan repayments, and one-off purchases can distort a forecast if they only appear when they fall due. Xero’s scenario-planning guidance specifically highlights tax payments, capex timing, and financing terms as variables you should model.
Including non-cash costs. Depreciation is a real accounting expense, but it does not leave the bank account when recorded. Non-cash costs such as depreciation, business use of home, and mileage should be left out of the cash flow forecast.
Being too optimistic about customer payment speed. Delays in getting paid can create shortfalls, and payment terms can shift cash receipts later than the sale itself.
Not updating the forecast. Rolling forecasts should be updated monthly in normal conditions and weekly during growth phases or tight cash periods. A forecast that is not updated quickly turns into wishful thinking.
Treating the forecast like a static budget. Do not rely on static budgets – rolling forecasts are meant to evolve as actual results come in.
Getting started
You can start for free with a spreadsheet. ACCA publishes an example cash flow template and says it should be adapted to suit your own business, with forecast, actual, and comparison views. Xero offers a free cash flow forecast template which allows you to enter upcoming costs and income on a timeline to see when you might have surplus cash. The British Business Bank also has a practical guide to creating a cash flow forecast.
Once transaction volumes increase, software becomes more useful. Xero’s UK forecasting tools show invoices due in, bills due out, and projected balances in weekly or daily views.
If you need more support, GOV.UK points limited company directors to guidance on running a company and getting business support, while Business.gov.uk offers support for starting, running, and growing a business. The British Business Bank also recommends seeking advice from a qualified accountant on cash flow forecasts.
Ready to start your business on the right financial footing? Register your limited company with Rapid Formations.
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