Working Capital: The Loan Nobody Underwrote

Key takeaways

• Trade credit is the second-largest liability U.S. companies carry: $4.39 trillion of trade payables at the end of 2025, equal to 31% of the $14.18 trillion of bonds and loans on the same balance sheets, with no rate sheet, no covenant and no underwriter.
• Apple's fiscal 2025 cash conversion cycle was −71 days; Fastenal's was +171. Two profitable American companies, the same twelve months, 242 days apart: one is funded by its suppliers, the other funds its customers.
• Growth withdraws cash before it deposits any. Fastenal's trade working capital rose $210.6m while revenue rose $654.5m in 2025: 32 cents locked up per incremental revenue dollar, ahead of any profit on it.
• Supplier credit is not free once you price it. Passing up a 2/10 net 30 discount to hold cash twenty extra days costs 37.2% a year, and Keurig Dr Pepper's disclosed supplier-finance balance went from $4,113m at the end of 2022 to $1,378m at the end of 2025.

Two lenders you never applied to

Every business is financed by somebody. The obvious somebodies are a bank and an owner. The two that never appear in a funding announcement are the supplier who lets you pay in 45 days and the customer who pays you a deposit before you start.

The scale of this is not a rounding error. In the Federal Reserve's Financial Accounts of the United States (Z.1), table L.103, nonfinancial corporate business held $4,392.2 billion of trade payables at the end of the fourth quarter of 2025, against $8,790.8 billion of debt securities and $5,391.8 billion of loans, or $14,182.6 billion of borrowed money all told. Trade payables are therefore 31% of the size of the entire bond-and-loan stack, and $4.39 trillion of $30.91 trillion in total liabilities. The same table shows $5,794.8 billion of trade receivables: corporations extend more credit than they receive, and the difference lands on households, governments and the rest of the world.

What makes this money different is not the amount, it is the absence of process. No one runs a credit committee on your payment terms. There is no rate quoted, no maturity schedule, no compliance certificate. That is why it gets used before it gets understood, and why it disappears without warning: a supplier can move you from net 45 to net 15 in one email, and nothing in your loan file will have changed.

The accounting identity underneath is simple and worth stating plainly. Receivables plus inventory minus payables is trade working capital, and it is an amount of money that has left your bank account and not come back. Somebody funds it. If payables are large enough, your suppliers fund all of it and lend you the rest. If payables are small, you fund it: out of profit, out of a credit line, or out of the owner's pocket.

The cycle, measured on three real balance sheets

The cash conversion cycle counts days: how long you wait to be paid, plus how long goods sit, minus how long you make suppliers wait. Days sales outstanding plus days inventory outstanding minus days payable outstanding. A negative answer means the business collects before it pays.

Throughout what follows, receivables are measured against revenue and inventory and payables against cost of sales, over a 365-day year. That is the standard convention, and it is worth knowing that it flatters payables at any company that buys heavily outside cost of sales.

Apple's fiscal 2025 (the year ended 27 September 2025) reported revenue of $416,161m, cost of sales of $220,960m, trade receivables of $39,777m, inventory of $5,718m and accounts payable of $69,860m. That is 34.9 days of receivables, 9.4 days of inventory and 115.4 days of payables, a cash conversion cycle of −71.1 days. Trade working capital is negative $24,365m. Apple does not merely avoid funding its supply chain; its supply chain hands it $24.4 billion and Apple keeps it.

Costco's fiscal 2025 (ended 31 August 2025) reported total revenue of $275,235m, merchandise costs of $239,886m, receivables of $3,203m, inventory of $18,116m and accounts payable of $19,783m: 4.2 days, 27.6 days and 30.1 days, for a cycle of 1.7 days. A warehouse club sells the pallet roughly two and a half days before the invoice for it comes due. Sitting beside that is $2,854m of deferred membership fees, money collected for a year of service not yet delivered.

Fastenal's 2025 reported revenue of $8,200.5m, cost of sales of $4,509.3m, receivables of $1,245.3m, inventory of $1,748.0m and accounts payable of $316.8m: 55.4 days, 141.5 days and 25.6 days, for a cycle of 171.3 days. That is 242.4 days away from Apple. It is not a failing. Fastenal's model puts inventory inside its customers' buildings, in vending machines and onsite stores, so that a bolt is three metres from the person who needs it. The inventory is the product. The 141.5 days are what the product costs to offer.

The lesson is not that negative is good and positive is bad. It is that the cycle is a design decision that most operators have never consciously made, and that the number tells you who is financing whom.

Growth is a withdrawal before it is a deposit

The most expensive year in a healthy company's life is usually its best one. Revenue up 30% means receivables up roughly 30% and inventory up roughly 30%, and both of those are cash going out ahead of the profit coming in.

Fastenal is the measured version. Its trade working capital went from $2,465.9m at the end of 2024 (receivables $1,108.6m plus inventory $1,645.0m less payables $287.7m) to $2,676.5m at the end of 2025 (up $210.6m) while revenue rose from $7,546.0m to $8,200.5m, up $654.5m. That is 32 cents of cash committed for every additional dollar of revenue, before a cent of profit on it. A company with that ratio growing 20% on $10m of revenue needs $640,000 it does not yet have.

Illustrative only: round numbers, no company. A distributor does $4,000,000 of revenue at 60% cost of sales, so $2,400,000 of cost. It collects in 45 days, holds 75 days of stock and pays suppliers in 30. Receivables are $493,151, inventory is $493,151 and payables are $197,260, so trade working capital is $789,042 and the cycle is 90 days. Working capital is 19.7 cents per revenue dollar.

Now grow 30%, to $5,200,000 of revenue and $3,120,000 of cost, with the cycle unchanged. Receivables become $641,096, inventory $641,096, payables $256,438: working capital of $1,025,754. The growth demanded $236,712 of cash. At a 5% net margin the company earns $260,000 that year, so 91% of the entire year's profit is consumed by the growth that produced it. Nothing has gone wrong. This is what success costs.

Now pull the two levers that are actually in reach. Cut inventory from 75 days to 60 and stretch payables from 30 to 45, leaving collections alone. The cycle falls from 90 days to 60. At the same $5,200,000 of revenue, receivables stay $641,096, inventory falls to $512,877 and payables rise to $384,658, for working capital of $769,315. That releases $256,439 against the unchanged-cycle case, more than the $236,712 the growth needed. Working capital ends the year $19,727 lower than it started, on 30% more revenue.

One day of cycle is worth $8,548 to this business at the larger size, and that is the number to keep. It converts a vague virtue, "tighten working capital," into a price you can compare against the cost of doing it: the discount you would give for faster payment, the stockouts a leaner shelf will cause, the supplier who will reprice you for slower payment. Every one of those has a number, and the day-value is what you weigh them against.

Note which lever is missing from that list. Collections stayed at 45 days, because in most businesses days sales outstanding is set by the customer, not by the seller. If two-thirds of your revenue comes from three large accounts, your DSO is whatever their accounts payable department has decided it is.

When the free money has a price

Trade credit looks free because no one sends an invoice for it. Price it and the illusion goes.

Take standard 2/10 net 30 terms: 2% off if you pay within 10 days, otherwise the full amount at 30. Declining the discount buys you 20 extra days of cash and costs 2% of a 98% payment. That is 2/98 = 2.04% for 20 days, and there are 18.25 such periods in a year: 37.2% annualised. Almost no operator would knowingly borrow at 37.2%, and a great many do it every month by default. The reverse is also true. If your working capital line costs 9%, taking every early-payment discount you are offered is one of the highest-return uses of that line available to you.

Stretching suppliers has a price too; it is just charged in the goods rather than the interest line. A supplier who is financing you for 90 days puts that cost somewhere, and the somewhere is your unit cost, your priority in an allocation, or the speed at which they answer the phone in a shortage.

The institutional version of the same trade is the supplier finance programme, also called reverse factoring, payables finance or structured payables. The buyer confirms an invoice as valid; a bank pays the supplier early at a discount; the buyer pays the bank on the original, long due date. The supplier gets cash, the bank gets a spread, and the buyer gets to keep a payables balance that behaves like debt sitting in accounts payable.

For years nothing in U.S. GAAP required that to be disclosed. FASB Accounting Standards Update 2022-04, issued September 2022, added Subtopic 405-50 and now requires a buyer to disclose the programme's key terms, the outstanding confirmed amount, where it sits on the balance sheet, and an annual rollforward. It is effective for fiscal years beginning after 15 December 2022, with the rollforward a year later. The Update is explicit that it "do[es] not affect the recognition, measurement, or financial statement presentation" of the obligations. It changed only what you can see.

Keurig Dr Pepper is a useful place to watch what became visible. Its Form 10-K for 2025 discloses obligations under supplier financing arrangements, confirmed as valid and included in accounts payable, of $1,378m at 31 December 2025, down from $1,740m a year earlier, $2,389m at the end of 2023 and $4,113m at the end of 2022, the comparative presented retrospectively. The 2025 rollforward is $1,740m opening, $3,424m of additions, $3,791m of settlements and $5m of currency: $1,378m out. Over three years the balance fell $2,735m, or 66.5%. The company's own risk factors say why it matters: payment terms with suppliers "generally range from 10 to 360 days," the length of those terms has been reduced in recent periods, and reductions "have contributed to... our need to utilize various financing arrangements for short-term liquidity." That is a public company stating in a filed document that supplier terms are financing, and that losing them sends you to a lender.

What actually breaks

Working capital does not fail gradually. It fails on a date, usually a date you could have circled months earlier.

The first failure is measuring the wrong day. A year-end balance sheet reports the calmest moment of the year, because most businesses deliberately run down stock before they close the books. Mattel's inventory was $563.1m at 31 December 2025. Six months earlier, at 30 June 2025, it was $867.9m, a $304.8m swing, with the mid-year figure 1.54 times the one in the annual report. A credit line sized off the annual balance sheet is short by roughly a third at exactly the point in the year the company needs it. Size against the peak month, and know which month that is.

The second failure is that the facility secured by your working capital shrinks when your working capital does, and gets dearer at the same time. The Dixie Group's amended credit and security agreement, filed as an exhibit to its Form 10-K in March 2026, defines the borrowing base as 90% of eligible accounts plus, for inventory, the lesser of 90% of net orderly liquidation value or 70% of cost. Two haircuts, and the tighter one governs. The pricing grid then charges 3.75% when availability is above 25% of the revolver, 4.00% at or below 25%, and 4.25% at or below 12.5%. If the borrowing base certificate arrives late, availability is deemed to be under 12.5% and the top rate applies until it does.

An earlier PAR Pacific facility, described in its Form 10-K, ran the same shape at 85% of eligible receivables plus the lesser of $82.5 million and 85% of eligible hydrocarbon inventory. The pattern to internalise is that asset-based credit is pro-cyclical: the month sales slip is the month the base falls, availability tightens and the margin steps up.

The third failure is concentration on the receivables side. One customer at 40% of revenue does not merely put revenue at risk; it hands that customer unilateral control of your DSO. They can move you from 30 days to 60 as a policy change applied to every vendor, and you will fund it.

The fourth is the one that kills otherwise sound companies: a profitable year in which cash goes down, and nobody in the business can say why. The answer is almost always in the cycle. Profit is measured on the income statement; the cycle is where the profit is being parked. A business can be right about margin, right about demand and right about its market, and still run out of money because it financed 90 days of somebody else's convenience with a bank balance that only covered 60.

Put it to work

Compute your cycle this quarter: receivables divided by revenue times 365, plus inventory over cost of sales times 365, minus payables over cost of sales times 365. Multiply one day by daily cost of sales: that is what a day is worth. Then measure your peak month, not year-end, and size the credit line against that. Price every early-payment discount before taking it.

Sources & references

Linked entries open the named source directly. Entries without a link say exactly what kind of reference they are — and how to check them yourself.

• Federal Reserve — Financial Accounts of the United States (Z.1), Table L.103, Nonfinancial Corporate Business, 2025:Q4
• SEC XBRL company facts — Apple Inc. (CIK 0000320193), fiscal 2025 Form 10-K figures
• SEC XBRL company facts — Costco Wholesale Corporation (CIK 0000909832), fiscal 2025 Form 10-K figures
• SEC XBRL company facts — Fastenal Company (CIK 0000815556), 2024 and 2025 Form 10-K figures
• SEC XBRL company concept — Mattel, Inc. (CIK 0000063276), quarterly inventory, net
• SEC EDGAR — Keurig Dr Pepper Inc., Form 10-K for 2025 (supplier financing arrangements rollforward; supplier payment terms risk factor)
• FASB — Accounting Standards Update 2022-04, Liabilities—Supplier Finance Programs (Subtopic 405-50)
• SEC EDGAR — The Dixie Group, Inc., Amendment No. 1 to Credit and Security Agreement (borrowing base and pricing grid), exhibit filed with Form 10-K, 26 March 2026
• SEC EDGAR — Par Pacific Holdings, Inc., Form 10-K for 2025 (borrowing base of the former discretionary draw facility)