Guide · 8 min read
Cash flow gap: how to spot it before it happens
A cash flow gap is a moment when the business has to pay more than it has in the account, even if it is profitable on paper. Many small businesses close not because they lose money, but because they run out of cash at the wrong moment.
- Profit shows if the business earns, cash shows if it survives
- Stock, customer payment delays and seasonality are the usual causes
- A monthly cash forecast shows the gap months in advance
- The deepest point of the cash curve is the reserve you need
Why profit and cash diverge
Profit is counted when you earn: the sale happened, the service was delivered. Cash moves when money actually arrives or leaves. Between them sit purchases paid in advance, customers who pay in 30 days, loan repayments, equipment, taxes paid quarterly and owner payouts.
Typical causes
- Inventory. You pay the supplier today and sell the goods over two months.
- Payment terms. B2B clients pay 30–60 days after delivery while salaries are due now.
- Seasonality. Costs are flat, revenue drops in the quiet months.
- Growth. More sales need more stock and staff before the money arrives.
- Loans and leasing. Principal repayments leave the account but do not show in profit.
- One-off payments. Equipment, annual licenses, taxes.
How to find a gap in a forecast
Build cash flow month by month: opening balance + inflows − outflows = closing balance. Whenever the closing balance goes below zero, that is a gap. Its depth is how much money you are short, and its month is when you need it.
A shop buys stock for $9,000 every two months, sells $6,000 worth monthly and pays $2,500 in fixed costs. In purchase months cash drops by $5,500, in the following months it grows by $3,500. Starting with $3,000 the account goes negative in the very first purchase month.
Six ways to close a gap
- Negotiate supplier payment terms or smaller, more frequent batches.
- Ask clients for prepayment or shorter payment terms.
- Shift one-off purchases to months with a surplus.
- Stagger hiring.
- Keep a reserve equal to the deepest gap plus a margin.
- Arrange a credit line in advance, not when the account is already empty.
How FinModel warns you
FinModel keeps profit and cash separately and shows a warning with the month and the amount: “Cash runs out in February 2027, at the lowest point you are short $14,200.” The pessimistic scenario shows whether the gap appears when sales are lower. The AI assistant can suggest what to change and show the effect before you apply anything.