How to Forecast Cash Flow for a New Business with No History

Forecasting cash for a business that hasn’t traded yet feels like guesswork, and some of it is. But a careful forecast still answers the questions that matter most before you start: how much money you need, when it runs lowest, and how long you can survive if sales are slower than hoped. Lenders and investors will ask for it, and it’s the best protection against starting with too little cash, one of the most common reasons new businesses fail.

Step 1: List start-up costs and when you pay them

Start with everything you must pay before or around opening, and the month each payment leaves your account:

• Equipment, tools, vehicles and fit-out
• Deposits on premises, plus rent in advance
• Opening stock and packaging
• Website, branding, signage and launch marketing
• Legal, accounting, licences and insurance
• Software set-up and first subscriptions
• Recruitment and training before you open

Timing matters. A fit-out might be paid in three stages; a lease deposit might be due at signing, months before opening.

Step 2: Build sales from the bottom up

Top-down guesses (“we’ll get 1 percent of the market”) are almost always too optimistic. Build sales from what you can actually do:

Then add a ramp-up. Few businesses hit normal sales in month one. A common pattern is 30 to 50 percent of normal in the first month, rising over three to six months. Check your answer against competitors, industry reports and anyone you know in the trade.

Step 3: Apply realistic payment timing

Decide how customers will pay and when the money reaches you. Card payments may settle in one to three days; marketplaces can hold payouts for a week or two; business customers commonly pay 30 to 60 days after invoice, and new suppliers of yours may not be paid on time by established customers. For a new business, assume customers pay later than your terms, not earlier.

Do the same for suppliers. New businesses often have to pay suppliers up front or on short terms until they build a track record, which makes the early months tighter.

Step 4: Add every running cost

List monthly costs in the month they are paid: rent, salaries and payroll taxes, your own drawings, utilities, insurance, software, marketing, loan repayments, card fees, accountancy and bank charges. Add quarterly and annual items in the right months, especially tax. If you don’t know a cost, get a quote rather than guessing.

Step 5: Put it together and find the low point

Combine the start-up costs, sales receipts and running costs into a monthly forecast, starting with the money you will put in. The lowest closing balance is the key number: it tells you the minimum funding needed to get through the first year.

A worked example

A new café plans to open in month 2 with $60,000 of the owner’s savings and a $40,000 loan.

The café loses money for its first few months of trading, and the balance bottoms out at about $21,000 around month 4, before growing again. That looks fine, until you run the worst case.

Where to find numbers when you have none

• Suppliers and landlords will give you quotes and payment terms; ask for them in writing.
• Industry associations often publish typical margins, costs and wage levels.
• Your bank or a local business support service may share benchmark data for your sector.
• People already in the trade, especially in a different town, are often happy to share rough figures.
• Competitors’ public information: prices, opening hours, staffing and, for larger firms, published accounts.
• Your own test: pre-orders, a market stall, a waiting list or a pilot client give real data before you commit.

Write down where each assumption came from. Lenders will ask, and in six months you’ll want to know which guesses were wrong.

Step 6: Build a worst case

Copy the forecast and change the assumptions a new business most often gets wrong:

• Sales 30 to 40 percent lower than planned, and slower to ramp up
• Opening delayed by one or two months, while rent and loan repayments continue
• Start-up costs 15 to 20 percent over budget
• Customers paying later than expected

In the café example, sales at 65 percent of plan and a one-month delay push the lowest point below zero around month 5. That tells the owner to raise more funding, reduce the fit-out, or line up an overdraft before signing the lease, not after opening.

Step 7: Decide how much money you need

A practical rule: the money you need is the lowest point in your worst case, plus a buffer of two to three months of fixed costs. If your plan only works when everything goes right, it isn’t funded yet.

Mistakes new businesses make

• Forgetting the owner’s living costs. If you need to draw $3,000 a month to live, it’s a cost.
• Assuming full sales from day one. Almost no business gets there.
• Leaving out tax. Sales tax or VAT, payroll taxes and income tax arrive later but they arrive.
• Treating the loan as income. It is cash in, but the repayments start soon, and they need to be in the forecast too.
• Not updating it after opening. Once you trade, replace guesses with actual figures every week.

After you open

Switch from planning to managing. Keep the 12-month forecast, add a 13-week weekly forecast, and update both with actual figures. Within three months you’ll have real payment patterns and real sales, and your forecast will become much more accurate. The general method is in how to make a cash flow forecast.

Templates for new businesses

If you’re raising investment rather than borrowing, the free Startup Runway template focuses on burn and runway. Industry templates give you the cash lines and timing that matter in your sector, such as food costs for a restaurant or stock for ecommerce.