A business can show ₹20 lakh profit on its P&L and simultaneously be unable to pay a ₹2 lakh supplier invoice. This isn't a hypothetical. It happens to businesses that are genuinely growing, doing real work, and making real sales.
The mechanism is straightforward: your profit is a calculation. Your cash is what's actually in your bank account. These two numbers move on different timelines. You sell in March. You collect in May. You have to pay for the raw materials in April. The profit is there on paper. The cash isn't.
This is why cash flow forecasting matters — not to satisfy a bank manager, but because it tells you when that gap is going to show up before it does.
What a forecast actually is
At its simplest, a cash flow forecast is a week-by-week or month-by-month projection of your bank balance. Starting from what you have now, you add expected inflows (customer payments, not sales) and subtract expected outflows (supplier payments, salaries, rent, taxes). The number at the end of each period tells you what your balance is expected to be.
If that number goes negative, you have a gap. If it's uncomfortably thin — less than one month of operating costs — you have a warning.
The 13-week window (roughly one quarter) is the most useful planning horizon for most businesses. Close enough that your estimates are reasonably accurate. Far enough to act on what you find.
The inflows people underestimate
The most common forecasting mistake is using sales figures instead of collection figures. A ₹10 lakh order signed in week one is not ₹10 lakh in week one. It's ₹10 lakh whenever the customer actually pays — which, for a business on 45-day terms with a customer who historically pays 10 days late, is week nine.
Go through your accounts receivable aging and map when each outstanding invoice is actually likely to land. Use history, not optimism. If a customer has never paid in less than 50 days, don't forecast 30 days.
The outflows people forget
Fixed outflows — rent, salaries, EMIs — are easy. Variable outflows and irregular ones are where forecasts get surprised.
GST payment is on the 20th of each month. TDS is on the 7th. Advance tax falls in June, September, December, and March. Annual insurance premiums. The CA's bill at year-end. These are all predictable if you list them out, but they'll hit your bank account unexpectedly if you're not tracking them in your forecast.
What to do when you see a gap
The value of a forecast isn't knowing that a gap exists. It's knowing early enough to do something about it. If your forecast shows a cash shortfall in week seven, you have seven weeks to respond.
Options: accelerate collections from customers who are close to due. Negotiate a delay with a supplier who doesn't charge interest. Draw down a credit line at a time when you're not desperate for it (desperate borrowing costs more). Delay a discretionary purchase.
All of these are easier to execute with advance notice than in the middle of a crunch.
A habit, not a project
A forecast only works if it's maintained. Fifteen minutes every Monday morning: update the actual balances, adjust expectations for what didn't come in as planned, extend the window by another week. Done consistently, you build a picture that gets more accurate over time because you understand your own payment patterns better.
The businesses that manage cash well aren't necessarily larger or more sophisticated. They just look at this number every week.
