Negative working capital

Negative working capital means the business is funded by its customers and suppliers rather than funding them. It happens where cash is collected before the product is delivered, or where suppliers are paid long after their goods have been sold. Grocery retail is the classic case, since stock turns in days while suppliers are paid in weeks, and subscription software is the other, since the customer pays annually in advance.

The valuation consequence runs against intuition. For most businesses the working capital line in a free cash flow build is a use of cash, because growth funds receivables and inventory before the customer pays. For a business with negative working capital growth is a source of cash, because the balance owed to suppliers and customers grows faster than the balance owed to the business.

It is a genuine economic advantage rather than an accounting quirk. The float is interest free funding that scales with the business, and it is a large part of why some retailers can operate on thin margins and still generate cash.

The trap is treating it as permanent. The release only exists while the business is growing. It stops at zero growth, and if the business shrinks the balance unwinds and consumes cash exactly when the business can least afford it, which is one reason a retailer in decline runs into liquidity trouble faster than its profit and loss account suggests.