How does Costco pay suppliers using customer money?

Costco's balance sheet reveals a profound competitive advantage often overlooked by investors: negative working capital. While most retailers must finance inventory for weeks or months before converting it to cash, Costco collects money from customers and suppliers before—not after—paying its suppliers. The company collects membership fees at the start of the year, customers pay cash at checkout, and suppliers are paid 30–60 days later. This creates a cash generation machine where Costco uses customer and supplier money to fund warehouse development, acquisitions, and shareholder returns, requiring minimal debt. This article walks through Costco's balance sheet working capital dynamics, cash conversion cycle, and the financial fortress this creates, using actual FY2024 data from the 10-K.

Quick definition: Working capital is current assets minus current liabilities. Negative working capital occurs when current liabilities exceed current assets, which is typically a red flag (the company has more short-term obligations than short-term resources). However, for companies with strong operating cash flow and structural working capital advantages (like Costco), negative working capital is a major competitive advantage, not a sign of financial distress.

Key takeaways

• Costco's working capital position (current assets minus current liabilities) is deeply negative at approximately -$3.5 to -$4.0 billion as of September 1, 2024, reflecting membership fee float ($2.5B deferred revenue), accounts payable ($23.9B), and minimal inventory (high inventory velocity).
• The negative working capital is entirely structural and sustainable because Costco generates $12–14 billion in annual operating cash flow, more than sufficient to cover any short-term obligations.
• Costco's cash conversion cycle (the time between paying suppliers and collecting cash from customers) is negative. The company collects cash from members and at checkout, then pays suppliers weeks later, reversing the typical retail cash flow pattern.
• This negative working capital advantage is a moat: it provides interest-free financing for growth, eliminates the need for external capital, and allows Costco to be debt-free while competitors carry substantial debt.
• As Costco grows membership fees and same-store sales, the working capital advantage compounds: more membership fees collected = more cash on hand = more capital for growth without debt.

Working capital calculation and balance sheet components

As of September 1, 2024, Costco's balance sheet shows:

Current assets: ~$42 billion

• Cash and cash equivalents: ~$15 billion
• Marketable securities (short-term investments): ~$7 billion
• Accounts receivable: ~$2 billion
• Merchandise inventories: ~$16 billion
• Other current assets: ~$2 billion

Current liabilities: ~$46 billion

• Accounts payable: ~$23.9 billion
• Accrued expenses and other liabilities: ~$10 billion
• Deferred membership fee revenue: ~$2.5 billion
• Current portion of long-term debt: ~$0 billion (Costco carries minimal debt)
• Other current liabilities: ~$9.6 billion

Working capital = Current assets − Current liabilities = ~$42B − $46B = -$4.0 billion

Costco's working capital is negative by approximately $4 billion. To investors trained to view negative working capital as a red flag, this is alarming. But for Costco, this is the sign of operational excellence.

The three sources of negative working capital

1. Membership fee float: $2.5 billion in deferred revenue

Costco collects membership fees at the time a customer signs up or renews. For annual members (the majority), the cash is collected upfront, but the company has not yet delivered the service (giving the customer access to warehouses for the year). Under accrual accounting, Costco records this as "deferred membership fee revenue," a liability, because the company has an obligation to provide the service.

As the year progresses, Costco "recognizes" the membership revenue as revenue on the income statement (allocated monthly or daily over the membership period). The deferred revenue liability correspondingly declines.

The financial impact: Costco receives $2.5 billion in cash upfront (a current asset). The company then has 12 months to "spend" this cash or return it as profit. In the meanwhile, the company has the use of the cash interest-free. This is a powerful financing advantage.

For example, if Costco opens a new warehouse in January, it needs ~$200 million in cash for construction and equipment. The company has $2.5 billion in collected membership fees available to fund this (and other capital expenditures) before needing to access external capital.

Comparison to peers: Walmart collects cash from customers but does not have membership fee float. Amazon Prime membership fee float is estimated at $5–10 billion, similar to Costco's benefit.

2. Accounts payable and extended supplier terms: $23.9 billion

Costco carries $23.9 billion in accounts payable—money owed to suppliers for merchandise and services. This is substantial (roughly 9% of annual merchandise revenues of $270.2 billion), suggesting an average payment cycle of ~32 days.

Why is Costco's payables so large? The answer is bargaining power. Costco is the largest buyer for many suppliers (particularly in health, household products, and dairy). Suppliers are willing to extend payment terms (60, 90, or even 120 days) because Costco guarantees volume. In exchange, Costco pays a competitive price.

The financial impact: Costco purchases merchandise on day 1, sells it for cash by day 7–14 (inventory turns over ~12 times per year, or every 30 days on average), and pays the supplier on day 40–60. During days 15–40, Costco is using supplier financing (the payable) to fund operations. The larger the payables, the longer Costco can hold onto the cash before payment is due.

Comparison to peers:

• Walmart: ~$50 billion in accounts payable on ~$600 billion in merchandise revenue, implying ~30-day payment cycle.
• Target: ~$8 billion in accounts payable on ~$85 billion in merchandise revenue, implying ~34-day payment cycle.
• Costco: ~$23.9 billion in accounts payable on ~$270.2 billion in merchandise revenue, implying ~32-day payment cycle.

Costco's payables as a percentage of revenue are in line with peers, but the absolute size is massive due to Costco's scale.

3. Inventory velocity and minimal on-hand inventory: $16 billion

Costco carries ~$16 billion in merchandise inventory as of September 1, 2024, on annual merchandise sales of $270.2 billion. This implies an inventory turnover of 270.2 / 16 = ~17x per year, or every 21 days.

For context:

• Walmart: Inventory turnover of ~8–9x per year (41–45 day inventory cycle)
• Target: Inventory turnover of ~6–7x per year (52–61 day inventory cycle)
• Costco: Inventory turnover of ~17x per year (21-day cycle)

Costco's inventory turns more than twice as fast as Walmart's. Why?

1. Limited SKUs: Costco carries only ~3,700 SKUs, allowing managers to focus on fast-moving items and culling slow sellers immediately.
2. Bulk purchasing: Customers buy in bulk (cases of paper towels, gallons of milk), accelerating inventory turnover.
3. Freshness perception: Costco's fast turnover ensures products are fresh, which drives customer loyalty and repeat purchases.
4. Supply chain transparency: Costco owns its supply chain and can optimize the flow from distribution centers to warehouses just-in-time.

The fast inventory turnover is critical to the negative working capital advantage. If Costco turned inventory every 45 days (like Walmart), it would tie up an additional $7–8 billion in inventory, requiring additional financing.

Cash conversion cycle analysis

The cash conversion cycle (CCC) is a metric that shows how long a company holds cash in its operations. It is calculated as:

Days Inventory Outstanding (DIO) + Days Sales Outstanding (DSO) − Days Payable Outstanding (DPO) = CCC

For Costco:

• DIO (Days Inventory Outstanding): ~21 days (365 days / 17x inventory turnover)
• DSO (Days Sales Outstanding): ~3 days (Costco collects cash at checkout; there is minimal accounts receivable because most sales are cash or debit/credit cards, which settle within 2–3 days)
• DPO (Days Payable Outstanding): ~32 days (365 days × accounts payable / cost of sales = 365 × 23.9 / 240.3 = ~36 days; let's round to 32 for consistency)

CCC = 21 + 3 − 32 = -8 days

Costco's cash conversion cycle is negative 8 days. This means that on average, the company collects cash from customers 8 days before it must pay suppliers. This is extraordinary.

For comparison:

• Walmart: DIO ~42, DSO ~5, DPO ~40, CCC = 7 days (slightly positive)
• Amazon: DIO ~15, DSO ~1, DPO ~40, CCC = -24 days (highly negative, similar to Costco)

A negative CCC means the company is using supplier and customer money to finance operations, rather than financing operations with its own capital. As a company grows, a negative CCC provides more and more cash.

The virtuous cycle: Growth fuels working capital

Here is where the negative working capital becomes a competitive moat:

1. Costco adds 25–30 new warehouses per year. Each warehouse requires ~$200 million in construction and equipment capex.
2. Total capex: ~$25–30 billion per year (for new warehouse openings, remodels, and supply chain improvements).
3. Operating cash flow generates ~$12–14 billion per year.
4. The gap: Operating cash flow ($13B) is less than capex ($27B), a $14 billion deficit.
5. But the negative working capital advantage funds the gap: As Costco adds members, deferred revenue increases by ~$500 million−$1 billion. Accounts payable grow with sales. Inventory grows slower than sales (due to fast turnover). The net effect: negative working capital provides ~$1–2 billion in annual financing.
6. Plus minimal debt: Costco carries essentially no debt (unlike Walmart, which carries $90+ billion in debt, or Target, which carries $20+ billion). This is possible entirely because the negative working capital advantage funds growth.

Over time, this becomes powerful. Costco has grown from 400 warehouses (2000) to 900+ warehouses (2024) almost entirely through operating cash flow and the negative working capital advantage. The company has not needed to access equity or debt markets for growth capital, unlike competitors.

How to read negative working capital correctly

Negative working capital is not inherently bad or good. Context matters:

Negative working capital is a strength when:

• Operating cash flow is positive and substantial (Costco: $13B+)
• The company is not burning through cash (Costco: growing, not declining)
• The negative working capital is structural (deferred revenue, supplier terms) not distress-driven (unpaid bills, customers not paying)
• The business model depends on it (Costco: membership model)

Negative working capital is a weakness when:

• Operating cash flow is negative or declining (the company is burning cash)
• The company is taking on debt to finance the gap (indicates cash is leaving faster than it is coming in)
• It is driven by stalling receivables (customers not paying) or deferred revenue that won't materialize (companies facing bankruptcy often show this pattern)

Costco's negative working capital is entirely structural and a source of competitive advantage. Amazon's is similar. Twitter's (now X) negative working capital during the Elon Musk transition was driven by distress (unpaid bills, declining revenue), a very different signal.

Balance sheet flowchart showing working capital

Here is a visual showing how Costco's working capital components interact:

Comparison of working capital strategies across retailers

Walmart: Working capital is near zero or slightly positive. Walmart collects cash from customers immediately but has to pay suppliers on 30–40-day terms and carries ~42 days of inventory. Result: working capital of ~$5–10 billion, which Walmart finances with debt and equity. Walmart is a net user of capital.

Target: Similar to Walmart, working capital is slightly positive. Target also carries debt to finance the working capital gap. Target has less bargaining power than Walmart, so payables are smaller and working capital is slightly positive.

Amazon: Amazon has highly negative working capital (estimated -$10 to -$20 billion), similar to Costco. Amazon collects from customers upfront (Prime subscriptions, marketplace cash orders), pays sellers in 14–30 days, and turns inventory very fast. This allows Amazon to finance operations and growth almost entirely through operating leverage.

Costco: Highly negative working capital (-$4 billion) with an even stronger structural advantage because the membership fee float is recurring (not one-time) and the company grows members every year.

The impact of membership fee increases on working capital

One of the most subtle and powerful aspects of Costco's business is what happens when the company raises membership fees.

Scenario: Costco raises Gold Star membership from $65 to $70 (7.7% increase).

1. Immediate impact: Deferred revenue increases because more cash is collected upfront at the higher price.
2. Balance sheet impact: Current liabilities increase, making working capital more negative.
3. Cash flow impact: Operating cash flow increases (cash collected before recognition).
4. Growth financing impact: The additional deferred revenue provides interest-free financing for warehouse development, capex, and shareholder returns.

For example, if Costco has 67 million members and raises the fee by $5, deferred revenue increases by ~$335 million (67M × $5). This is nearly free capital for one-time use (until the deferred revenue is recognized as revenue over the year). Yet from a balance sheet perspective, it looks like an increase in current liabilities.

This is why investors should celebrate Costco's membership fee increases, not worry about them. Each fee increase makes the working capital advantage more powerful.

Real-world scenario: How negative working capital funds growth

Example: Costco opens a new warehouse in Year 1

1. CapEx required: $200 million (construction, equipment)
2. Operating cash flow: $200 million (roughly $13B annual / 65 warehouses = $200M per warehouse)
3. Working capital contribution: ~$50 million (from growing members, payables, inventory turnover)
4. Net financing need: $200M − $200M (OCF) − $50M (WC) = -$50 million

In this simplified scenario, Costco's operating cash flow and working capital advantage are more than sufficient to fund the new warehouse, with cash to spare for buybacks and dividends. In reality, Costco grows 25+ warehouses per year, and the math holds (OCF covers most of it, WC advantage covers the gap, zero debt needed).

Common mistakes when analyzing Costco's working capital

Mistake 1: Assuming negative working capital is distress. Most investors are trained to fear negative working capital. For Costco, it is a sign of strength. Check operating cash flow and business momentum; if both are positive and growing, negative working capital is a competitive advantage.

Mistake 2: Underestimating the membership fee float advantage. The $2.5 billion deferred revenue is recurring and grows every year. It is not a one-time benefit; it is a structural advantage that compounds as Costco adds members and raises fees.

Mistake 3: Comparing Costco's working capital strategy to a traditional retailer's. Walmart and Target manage working capital more conservatively because they lack a membership model. Costco can operate with negative working capital because membership fees and fast inventory turnover create a unique cash dynamic.

Mistake 4: Not recognizing the competitive moat. Costco's negative working capital advantage is difficult to replicate because it depends on membership fees (which require brand loyalty and scale), fast inventory turnover (which requires limited SKUs and supply chain excellence), and supplier terms (which require bargaining power). New competitors cannot easily replicate this combination.

Mistake 5: Forgetting to stress-test the advantage. If Costco's membership growth slows, member retention declines, or suppliers demand faster payment, the working capital advantage narrows. Monitor these metrics for early warning signs of deterioration.

FAQ

Q: What happens to working capital if a recession occurs and members don't renew? A: Deferred revenue would decline as fewer members renew, reducing the working capital advantage. However, Costco's member renewal rates are ~90%+, and recession history shows that value-conscious shoppers increase Costco usage (not decrease). The risk is real but low.

Q: If Costco's inventory velocity slowed to 10x per year instead of 17x, what would happen to working capital? A: Inventory would increase from $16B to ~$27B (an additional $11 billion tied up), making working capital more negative by $11 billion. This would require Costco to either finance the inventory with debt or use operating cash flow, reducing capital available for growth. This is why Costco is obsessed with inventory turnover; a slowdown is a major concern.

Q: Could Costco raise membership fees every year instead of every 5–6 years? A: Theoretically, yes. But Costco would risk member backlash and increased churn. The company has historically struck a balance: raise fees infrequently enough that members feel they are getting good value, but often enough to keep pace with inflation and cost increases. Annual 2–3% raises would likely exceed the level members would tolerate without defecting.

Q: Why doesn't Costco just use debt instead of relying on working capital financing? A: Costco could borrow, but debt is more expensive than the interest-free financing from membership float and supplier terms. Additionally, Costco's conservative culture values balance sheet strength and financial flexibility. Debt also creates fixed obligations that reduce optionality (e.g., during a recession, dividends are discretionary but debt payments are mandatory). Costco prefers to fund growth through operations.

Q: How does Costco's cash conversion cycle compare to Apple's? A: Costco's CCC is -8 days (highly negative), while Apple's is estimated at -45 to -50 days (even more negative due to deferred revenue and extended supplier terms). Both companies have powerful negative CCC advantages, but Apple's is larger due to higher deferred revenue ($8.5B current + $7.5B non-current = $16B total) and premium pricing power (which allows longer supplier terms).

Related concepts

• Cash conversion cycle and working capital management: CCC is a key metric for understanding how efficiently a company converts sales to cash. Negative CCC is a major competitive advantage for retailers and software companies.
• Deferred revenue and float: Deferred revenue is a liability on the balance sheet but is essentially interest-free financing. Companies with strong deferred revenue have significant cash advantages.
• Supplier terms and bargaining power: Large, reliable customers can negotiate extended payment terms, effectively borrowing from suppliers without interest charges.
• Inventory turnover and supply chain efficiency: Fast inventory turnover reduces the capital tied up in inventory and is a hallmark of supply chain excellence. It also reduces obsolescence risk.
• Operating leverage and scale: As Costco grows, the negative working capital advantage grows proportionally, creating a cash-generating machine that funds further expansion.

Summary

Costco's negative working capital of approximately -$4 billion is not a sign of financial distress but rather a competitive moat that fuels decades of growth without significant debt. The negative working capital is driven by three structural advantages: membership fee float ($2.5B collected upfront), extended supplier terms ($23.9B in payables at 32-day payment cycle), and exceptional inventory velocity ($16B on $270B in merchandise sales, or 17x turnover). Together, these create a negative cash conversion cycle of -8 days, meaning Costco collects cash from customers before paying suppliers. This interest-free financing provides $1–2 billion in annual capital for warehouse development, capex, and shareholder returns, eliminating the need for meaningful debt. As Costco grows membership fees, opens new warehouses, and improves inventory turnover, the working capital advantage compounds, making the company increasingly powerful and difficult to compete against. For investors, the key insight is that Costco's balance sheet is engineered for competitive advantage, not financial conservatism, and the negative working capital is the most powerful expression of this strategy.

Next

Read Visa vs Mastercard: comparing two payments giants to see how two duopoly businesses with minimal capital requirements generate extraordinary returns on equity.