Growth can improve the P&L and make next month’s bank balance worse. That isn’t a paradox. It’s what happens when inventory is paid for before the customer pays the invoice.
To forecast the cash cost of revenue growth, estimate the extra money tied up in receivables and inventory, subtract the supplier credit that actually finances it, then put the underlying receipts and payments on a calendar. Gross margin tells you whether the sales are attractive. It does not tell you whether you can fund them.
Calculate the working capital the plan will absorb
Consider a hypothetical business expecting an additional $3 million in annualized sales at a 30% gross margin. Assume all sales are on credit, inventory costs follow the additional $2.1 million in annualized cost of goods sold, and the operating cycle holds steady at 45 days to collect, 40 days of inventory and 30 days to pay suppliers.
Using 365-day approximations, the incremental balances are:
- Receivables: $3,000,000 × 45 / 365 = approximately $370,000.
- Inventory: $2,100,000 × 40 / 365 = approximately $230,000.
- Trade payables: $2,100,000 × 30 / 365 = approximately $173,000 of financing from suppliers.
That leaves roughly $427,000 of incremental operating working capital ($370,000 + $230,000 − $173,000). It’s a rough steady-state funding requirement, not a one-time expense or a prediction of the worst weekly cash balance.
The $900,000 of additional annualized gross profit in the sales plan may be perfectly real. It simply won’t arrive in the bank on the day the forecast is approved. For the accounting distinction, the SEC’s guide to financial statements explains how operating cash flow adjusts reported earnings for changes in operating assets and liabilities.
Stress-test terms before celebrating the growth
Now assume collection time slips from 45 to 60 days and inventory sits for 50 days rather than 40. Supplier terms remain at 30 days. With the same sales and margin assumptions, the extra working capital requirement rises to approximately $608,000. That’s about $181,000 more funding than the original case.
No change in the gross margin assumption. No heroic new revenue target. Just customers paying later and stock sitting longer. The cash forecast has found a problem the income statement was never designed to show.
Those calculations assume relatively stable sales and balances. A product launch, seasonal order or large customer contract can create a larger temporary funding peak. That’s why the next step is to model the dates, not to present the $427,000 as a universal answer. Our earlier piece on working capital versus available cash explains why a favorable balance-sheet total can still leave a payment shortfall.
Turn the estimate into a funding decision
Build a weekly cash schedule from purchase orders, supplier due dates, planned shipments, customer invoice dates and likely collections. Separate committed borrowing capacity from financing the team merely hopes to secure. Then test the week with the lowest headroom, using a collection-delay case informed by actual customer behavior. A separate look at DSO and collection assumptions can help challenge that case.
Leadership can then decide whether to phase orders, renegotiate agreed payment terms, secure funding before the ramp, or change the sales timetable. ‘We’ll grow into the cash’ is not a financing plan. It’s a sentence usually delivered before someone opens a spreadsheet.
If the growth plan needs a cash model that holds up under those questions, The Schlott Company’s cash flow forecasting work connects operating assumptions to the funding dates management needs to see.