Paid in Advance, Refundable at Any TimeWide moat

Costco Wholesale (COST) — moat facet

Three billion dollars of customer money that need never be repaid, offered back in full at any moment — and the willingness to offer it is the proof it is safe.

Two facts about the membership fee sit oddly together and both matter.

Customer and supplier money on the balance sheet ($M), Q3 FY2026$3,157MDeferred membership fees$2,948MAccrued member rewards$2,945MPayables above inventoryAbout $9bn of interest-free funding from members and suppliers combined.
Three separate pools of other people's money, none of it borrowed and none of it costing anything. It is why the company holds $20bn of cash against $5.7bn of debt.

The first is that Costco is paid before it delivers. Membership fee revenue is recognised rateably over the twelve-month period, so at any moment the balance sheet carries the unearned portion as deferred membership fees: $2,854 million at the end of fiscal 2025, $3,157 million at the third quarter of fiscal 20261. That is three billion dollars of interest-free money supplied by customers, replenished continuously as the base grows, and it never has to be repaid so long as members keep renewing.

The second is that Costco will refund it in full, at any time, no questions asked. The membership is disclosed as recognised "net of refunds"2, and the company's standing policy is that a dissatisfied member can walk to the desk and get the whole fee back on the spot. Most subscription businesses would consider that suicidal. Costco treats it as advertising, and the fact that it can afford to is itself the proof: a business whose product is worth the price does not lose much to a refund policy, and the willingness to offer one is a costless signal that nobody without the goods can imitate.

The combination is the reason to treat the fee as something other than revenue. It is a deposit with a twelve-month term, no interest, no lock-up, and a renewal option Costco reprices every five or six years. Together with supplier credit — accounts payable of $22,363 million against inventories of $19,418 million at the third quarter3 — it is why the company runs on other people's money while holding $19,996 million in cash and short-term investments and only $5,670 million of long-term debt.

Track deferred membership fees as a share of trailing membership revenue: about 71% at the third quarter of fiscal 20264. A steady ratio means the base is renewing on schedule. A falling one means fees are being recognised faster than they are being collected, which happens when sign-ups slow.

Moat trajectory: Widening

Deferred membership fees rose from $2,854 million to $3,157 million in three quarters. The float grows with the base, and the base is growing.

The number that tests this moat
Reported
Deferred membership fees
$3,157M at the third quarter of fiscal 2026, from $2,854M

Customer money collected before anything is delivered, refundable in full at any time and in practice almost never reclaimed. A falling balance against trailing fee revenue would mean sign-ups had slowed.

Source: Costco Form 10-Q, quarter ended May 10, 2026 ↗
⚠ Threats to the moat
⚠ THREAT 01
The Float Reverses If Growth Stops
The cash that arrives because the business is expanding is not a moat, and it leaves the way it came.
References
  1. ReportedMembership fee revenue is recognised rateably over the twelve-month period, so at any moment the balance sheet carries the unearned portion as deferred membership fees: $2,854 million at the end of fiscal 2025, $3,157 million at the third...
    Costco Form 10-Q, quarter ended May 10, 2026 - MD&A (comparable sales +10% and +7% excluding fuel and currency, ticket +7% against frequency +2%, membership fees $1,373M, renewal 92.2% and 89.7%, gross margin 11.04%) — Q3 FY2026 and the first 36 weeks · publ. June 3, 2026 · source ↗
  2. ReportedThe membership is disclosed as recognised "net of refunds", and the company's standing policy is that a dissatisfied member can walk to the desk and get the whole fee back on the spot.
    Costco Form 10-K, fiscal year ended August 31, 2025 - consolidated financial statements and notes (income statement, balance sheet, Note 11 segment reporting, disaggregated revenue by merchandise category, legal proceedings) — FY2025 · publ. October 8, 2025 · source ↗
  3. ReportedTogether with supplier credit — accounts payable of $22,363 million against inventories of $19,418 million at the third quarter — it is why the company runs on other people's money while holding $19,996 million in cash and short-term...
    Costco Form 10-Q, quarter ended May 10, 2026 - condensed financial statements and notes (total revenue $70,527M, operating income $2,815M, diluted EPS $4.93, balance sheet, segment table, 928 warehouses) — Q3 FY2026 and the first 36 weeks · publ. June 3, 2026 · source ↗
  4. ReportedTrack deferred membership fees as a share of trailing membership revenue: about 71% at the third quarter of fiscal 2026.
    Costco Form 10-Q, quarter ended May 10, 2026 - MD&A (comparable sales +10% and +7% excluding fuel and currency, ticket +7% against frequency +2%, membership fees $1,373M, renewal 92.2% and 89.7%, gross margin 11.04%) — Q3 FY2026 and the first 36 weeks · publ. June 3, 2026 · source ↗
Sources
Generated September 23, 2026