What is working capital?

If you're buying a small business or franchise, working capital might be the single most important number on the balance sheet — and the one most likely to hide a liquidity crisis. When you acquire a company, you’re not just buying their customer list and brand: you’re inheriting their payroll cycle, their supplier payment terms, and their inventory that may or may not turn into cash fast enough to pay rent. In asset purchase agreements, working capital is often pegged at a 'normalized' level that must still be in the business on closing day. If the seller has been bleeding receivables or starved the inventory to make profits look higher, you could take over a technically profitable business that runs out of cash in week two. For someone validating a startup idea, the concept moves you beyond 'is this idea profitable?' to 'how much cash will this idea consume before it becomes self-sustaining?' — which is really the only question that matters in the first year.

Calculating working capital is mechanically simple — current assets (cash, accounts receivable, inventory) minus current liabilities (accounts payable, short-term debt, accrued expenses due within a year) — but the nuanced analysis is what separates good deal-makers from trainwrecks. You're looking for the quality and turnover speed of those assets: a business showing $200,000 in 'current assets' with $190,000 of that trapped in slow-moving inventory that takes 140 days to sell has a serious working-capital problem, even though the ratio looks healthy at first glance. In 2026, with the lingering effect of supply-chain financing shifts and higher-for-longer interest rates, buyers are increasingly adding a 'working capital peg' to the purchase agreement — a target net working capital amount — and any shortfall at closing directly reduces the purchase price, dollar for dollar. For startups, you forecast working capital by building out a month-by-month use-of-funds model, not just a P&L, and smart founders now raise their working capital needs as a separate tranche from their development budget.

A dangerous misconception is that negative working capital is always a red flag or that positive working capital is always good. Some business models — think subscription SaaS companies or fast-food franchises that collect cash from customers days or weeks before paying suppliers — routinely operate on negative working capital because they get paid first and pay later. That's actually a beautiful thing if the cash flow is predictable. The mistake buyers make is seeing negative working capital in, say, a small manufacturing business where it doesn't belong — it usually means the owner has been stretching payables to 90+ days and not investing in necessary raw materials, which means you're about to inherit vendor relationships on life support. In 2026, with commercial credit tightening for sub-$5M businesses, that kind of negative working capital is a time bomb, not an efficiency.