Cash flow vs profit: why profitable firms run out of cash

A business can report its best month on record and be unable to pay salaries in the same week. Both facts are correct, and they are not in conflict once you notice they are measuring different things. Profit measures whether the work you did was worth more than it cost, counted at the moment the work was done and the sale was made. Cash flow measures what actually moved through the bank account, counted at the moment the money arrived or left. The gap between them is entirely a question of timing.

This is not an accounting technicality; it is the mechanism behind most failures of otherwise viable businesses. Suppliers, staff and landlords are paid in cash, on dates they choose, and none of them can be paid with profit. An owner watching a healthy profit figure while the balance falls is reading a real number that answers a different question from the one that determines whether the business survives the month.

The largest source in most small businesses is receivables. A sale of ₹10 lakh invoiced today with payment terms of 60 days appears in this month's profit in full and in this month's cash not at all. The costs of delivering it — materials bought, staff paid, subcontractor settled — were mostly cash out during the month. So a large, profitable sale can consume cash rather than provide it, and the bigger the sale the bigger the hole it digs before it fills it.

Inventory works the same way in reverse order: cash converts into stock the moment you buy it, and back into cash only when the stock sells. Stock sitting on a shelf is cash you have already spent and cannot spend again. Payables are the one lever pointing the other way — money you owe but have not yet paid is cash still in your account. And three items hit cash while barely touching profit: buying equipment, which is spread across years in the accounts but paid at once; loan principal repayments, which are not a cost at all in the profit calculation; and the owner's own drawings.

The counterintuitive consequence is that growing quickly increases the cash requirement even when every individual sale is profitable. Each new order needs materials bought and labour paid before the customer pays. Double the order volume and you double that upfront requirement, while the incoming payments still arrive on the old delay. Profit rises and the bank balance falls, at the same time, from the same cause. This is why businesses fail in their best year, and why an owner in that situation is often told to slow down by an accountant they think has misunderstood.

The pattern is worth internalising because it makes a specific decision legible: accepting a large order you cannot fund is a real risk rather than an obvious win. The relevant question about any big new order is not only whether it is profitable but how much cash it consumes before it returns any, and whether you have that cash without starving everything else. A profitable order that empties the account before its payment arrives can end a business that would have survived without it.

The practical instrument here is a rolling forecast covering the next 13 weeks — one quarter, in weekly columns. Weekly matters, because monthly totals hide the fact that rent leaves on the third and the customer pays on the twenty-fourth. Build it in four rows: opening bank balance, cash in, cash out, closing balance, which carries into the next week's opening. Fill cash in from actual invoices and their actual expected payment dates, not from expected sales — this is a cash document, so an invoice sits in the week you genuinely think the money will arrive, based on when that customer has paid before rather than what the terms say.

Cash out is the easier half and the part people underdo: salaries, rent, supplier payments due, loan instalments, tax payments, subscriptions, and your own drawings. Then read the closing balance row for the lowest number. That single figure is what the exercise is for, because it tells you in advance which week is tight, while there is still time to do something cheap about it — chasing a payment, asking a supplier for a fortnight, delaying a purchase, or moving an outgoing by a week. Update it weekly; a forecast built once and left alone stops being a forecast.

Most of the levers work on timing rather than on amounts, which is why seeing the gap early is worth so much. On the incoming side: invoice the day the work is done rather than at month end, state terms explicitly, ask for a deposit or staged payments on large jobs, and chase politely and immediately, because an invoice that goes unmentioned for a month teaches the customer what your real terms are. On the outgoing side: ask suppliers for longer terms before you need them, align your payment dates so they fall after your main receipts, and postpone discretionary purchases into a week with room.

Structural changes are slower and more durable. Reducing the delay between spending cash and receiving it — smaller stock holdings, faster delivery, deposits as standard — shrinks the cash requirement permanently. It is also worth arranging a facility while the business looks healthy rather than when it is short, since the terms available to a business with a visible problem are worse. None of this changes profit. It changes whether the profit is accessible when the bills arrive, which is the only version of profit that pays anyone.

A 13-week forecast is a set of predictions about other people's behaviour, and the largest input is when customers will pay, which you do not control and cannot know. It will be wrong. Its value is not accuracy but early warning: a forecast that identifies a tight week four weeks out gives you cheap options, where the same discovery on the day gives you expensive ones. Build it with dates based on when customers have actually paid historically rather than the terms on the invoice, and the errors get smaller — but they do not disappear.

It also cannot tell you whether the business is fundamentally sound. A forecast showing adequate cash throughout is compatible with a business making a loss on every sale, and a forecast showing a crunch is compatible with a strong business growing fast. The two documents answer different questions and neither substitutes for the other: profitability tells you whether the business works, cash flow tells you whether it survives long enough to matter. A recurring crunch that persists after the timing levers have been pulled is usually not a cash problem at all, but a margin or a fixed-cost problem showing up in the cash account.