Does Costco Take Capital One Credit Cards?

💳🏬❓

Costco Official • Capital One Official • Verified March 2026

The answer depends on which Capital One card you have — Visa, Mastercard, or a card in transition. This plain-language guide covers every Capital One card type, where each one works at Costco, and what to do if yours doesn’t.

✅ The Direct Answer — It Depends on Your Card

Some Capital One Cards Work at Costco. Others Do Not.

✅ Works In-Store & Online

Capital One Venture X — Visa network. Works at every U.S. Costco warehouse, gas station, and on Costco.com.

❌ Does NOT Work In-Store

Quicksilver, Venture, Savor, SavorOne, Platinum — most are Mastercard. Not accepted at Costco warehouses or gas stations in the U.S.

⚠️ Works Online Only

Mastercard Capital One cards — accepted on Costco.com and the Costco app only. Not at in-store checkout or gas pumps.

🔔 Breaking — Network Change

New Quicksilver, Savor & Venture cards are moving to the Discover network as of Feb–Mar 2026. Discover is not accepted at Costco anywhere.

💡 10 Key Facts About Capital One Cards at Costco

Capital One is one of the largest credit card issuers in the United States — and one of the most confusing when it comes to Costco, because Capital One offers cards on three different payment networks: Visa, Mastercard, and now Discover. Whether your Capital One card works at Costco depends entirely on which network your specific card runs on. Here is the complete picture, sourced from Costco’s official payment page, Capital One’s official site, and verified financial publications updated as recently as March 2026.

1
Does Costco accept Capital One credit cards? It depends entirely on whether your Capital One card is a Visa, Mastercard, or Discover card.
Costco’s official payment page (updated March 2, 2026) is clear: U.S. Costco warehouses accept only Visa credit cards in-store. Capital One issues cards on multiple networks — Visa, Mastercard, and increasingly Discover following its merger with Discover Financial. If your Capital One card has a Visa logo, it works at Costco in-store and online. If it has a Mastercard or Discover logo, it is declined in-store but accepted on Costco.com.
2
Which Capital One card is accepted at Costco in-store? The Capital One Venture X Rewards Credit Card — it is a Visa and works at all U.S. Costco warehouses.
The Capital One Venture X Rewards Credit Card carries the Visa logo and is confirmed by UpgradedPoints, JohnnyJet, and FinanceBuzz as one of the best Visa cards to use at Costco in-store. It earns 2 miles per dollar on all purchases including Costco — which, at Capital One’s valuation of approximately 1.8 cents per mile, amounts to around 3.6% effective return on every Costco purchase. WalletHub (Jan 2026) confirms the Venture X remains on the Visa network and is not affected by Capital One’s Discover transition.
3
Does the Capital One Quicksilver card work at Costco? No — not in-store. Most Quicksilver cards are Mastercard and are declined at Costco warehouse checkouts.
WalletHub (updated March 17, 2026) confirms: “You can’t use your Capital One Quicksilver card at Costco warehouses because this is a Mastercard credit card, while Costco warehouses in the U.S. accept only Visa credit cards.” However, a Quicksilver Mastercard can be used for purchases on Costco.com and the Costco app. Important update: as of early 2026, Capital One is beginning to issue new Quicksilver cards on the Discover network — which is not accepted anywhere at Costco. Check the logo on your specific card.
4
Does the Capital One Venture card (not Venture X) work at Costco? Most Venture cards are Mastercard — declined in-store. Some versions may be Visa. Check your card’s logo.
WalletHub (Jan 2026) notes: “The Capital One Venture Rewards Credit Card is a Mastercard, but some applicants might receive a Visa depending on the source of their application.” This means you must look at the network logo on the front or back of your physical card. If your Venture card says “Visa” — it works in-store at Costco. If it says “Mastercard” — it does not. There is no way to tell from the card name alone; you must check the network logo on your specific card.
5
Do Capital One Savor and SavorOne cards work at Costco? No — both are Mastercard cards and are declined at Costco in-store. Accepted on Costco.com only.
The Capital One Savor Cash Rewards Credit Card and the Capital One SavorOne Cash Rewards Credit Card both run on the Mastercard network and are not accepted at Costco warehouses or gas stations in the United States. They can be used on Costco.com and the Costco app for online purchases. Additionally, TheStreet (Mar 2026) reports that new Savor cards are beginning to be issued on the Discover network — which is not accepted at Costco in-store or online.
6
What is the breaking news about Capital One switching some cards to Discover — and why does it matter for Costco? Important: Capital One is migrating new Quicksilver, Savor, and Venture cards to the Discover network. Discover is not accepted at Costco anywhere.
TheStreet and Doctor of Credit (March 5, 2026) confirmed that Capital One has begun issuing new Venture, Savor, Quicksilver, VentureOne, SavorOne, and QuicksilverOne cards on the Discover payment network — a move tied to Capital One’s $35.3 billion acquisition of Discover Financial. Discover is not accepted at Costco in-store or online. If you receive a new or replacement Capital One card with a Discover logo, it will not work at Costco anywhere. The Venture X and business cards remain on Visa and Mastercard for now.
7
Can I use a Capital One Mastercard on Costco.com even if it doesn’t work in-store? Yes — Costco.com and the Costco app accept Mastercard credit cards, so Capital One Mastercard cards work online.
Costco’s official payment page confirms that Costco.com and the Costco app accept both Visa and Mastercard credit cards. This means a Capital One Quicksilver, Savor, SavorOne, or Mastercard-network Venture card can be used for any online Costco purchase — including groceries, appliances, electronics, Costco Travel bookings, and clothing. The Mastercard restriction is in-store only: at the register in the warehouse and at the gas pump.
8
Does a Capital One debit card work at Costco? It depends — if processed as PIN debit, it may work. Capital One debit cards are transitioning to the Discover network, which creates uncertainty.
Costco accepts “most PIN-based debit/ATM cards” regardless of network. Since mid-2025, Capital One has been replacing over 25 million debit cards with ones operating on the Discover network — TheStreet (Mar 2026) reports this transition is expected to wrap by year-end. Discover-branded debit cards used as PIN-debit transactions may still process through PIN-debit networks at Costco, but this is not guaranteed. If you have a Capital One debit card, try it with your PIN and have a backup payment method ready.
9
Can I use Apple Pay or Google Pay with a Capital One Mastercard to get around Costco’s Visa rule? No — the Visa-only rule applies to the underlying card network, not the payment method. A Capital One Mastercard linked to Apple Pay is still declined in-store.
Costco’s official payment page confirms mobile payments (Apple Pay, Google Pay, Samsung Pay) are accepted in-store — but only when the linked card is a Visa. JohnnyJet confirms: “there are many data points where people tried paying with a linked Mastercard credit card…and the transaction failed until they swiped a Visa product.” Linking your Capital One Mastercard or Discover card to Apple Pay does not make it work at Costco. The wallet app does not change the underlying card network.
10
What is the best Capital One card to use at Costco for seniors who want to maximize rewards? The Capital One Venture X Rewards Credit Card — Visa network, earns 2x miles on all purchases including Costco.
UpgradedPoints rates the Capital One Venture X as the best credit card for earning rewards at Costco from a non-Citi option. It earns 2 Capital One miles per dollar on all Costco purchases, which at Capital One’s valuation of 1.8 cents per mile delivers an effective return of approximately 3.6% — higher than the Costco Anywhere Visa Card’s 2% rate on Costco purchases. The Venture X is also the Capital One card confirmed to be staying on the Visa network, making it the only Capital One card that reliably works at Costco in-store today and for the foreseeable future.

Sources: Costco Official Customer Service (customerservice.costco.com, 03/02/2026 — Visa only in-store; Mastercard online only); WalletHub “Capital One Quicksilver at Costco” (updated 03/17/2026 — Mastercard declined in-store; Quicksilver Visa confirmed); WalletHub “Best Capital One Visa Cards” (Jan 20, 2026 — Venture X is Visa; Venture may be MC or Visa); UpgradedPoints “8 Best Credit Cards for Costco” (Mar 2026 — Venture X recommended for Costco); TheStreet “Capital One Foreshadows Changes” (Mar 2026 — Venture/Savor/Quicksilver moving to Discover); DoctorOfCredit (Mar 5, 2026 — Capital One confirmed Discover transition for new cards; Venture X stays Visa); JohnnyJet (mobile pay Mastercard fails); BGR Feb 17, 2026 (Capital One cards not accepted at Costco in-store)

💳 Every Major Capital One Card at Costco — Card by Card

🔑 How to Check Your Own Card Right Now

Turn your Capital One credit card over and look for the network logo in the bottom-right corner. If it says Visa — your card works at Costco in-store and online. If it says Mastercard — your card works on Costco.com and the app only. If it says Discover — your card is not accepted at Costco in-store or online. The card name (Quicksilver, Venture, Savor) does not tell you — only the network logo on the physical card does.

✅ Works In-Store Capital One Venture X Rewards Credit Card Visa Network

Accepted at all U.S. Costco warehouses, gas stations, and on Costco.com. Earns 2x Capital One miles on all purchases — worth approximately 3.6% in travel redemption value per UpgradedPoints. $395 annual fee. Excellent travel benefits including $300 annual travel credit, 10,000 anniversary bonus miles, and Priority Pass lounge access. Confirmed by Capital One and TheStreet (Mar 2026) to remain on the Visa network — not transitioning to Discover. The only Capital One card guaranteed to work at Costco in-store going forward.

❌ In-Store Declined Capital One Quicksilver Cash Rewards Credit Card (Mastercard) Mastercard Network

Declined at all U.S. Costco warehouse checkouts and gas stations. Accepted on Costco.com and the Costco app only. Earns 1.5% cash back on all purchases. WalletHub (updated Mar 17, 2026) confirms in-store decline. Network transition notice: As of early 2026, new Quicksilver cards are being issued on the Discover network (per TheStreet/Doctor of Credit Mar 2026) — Discover is not accepted anywhere at Costco. Check the logo on your specific card.

✅ Works In-Store Capital One Quicksilver — Visa Version (if applicable) Visa Network

WalletHub confirms: “Yes, if it’s a Visa. I use my Capital One Quicksilver Visa for all my U.S. Costco store purchases.” Some Quicksilver cardholders received Visa-branded cards. Check the network logo on your physical card — if it shows Visa, your Quicksilver works in-store at Costco just like any other Visa card.

⚠️ Check Your Card Capital One Venture Rewards Credit Card Usually Mastercard — Sometimes Visa

Most Venture cards are issued as Mastercard — declined in-store at Costco, accepted on Costco.com. However, WalletHub notes some applicants receive a Visa-branded Venture depending on the application source. Additionally, TheStreet (Mar 2026) reports new Venture cards may be moving to the Discover network. You must check the logo on your specific card to know where it works. If Mastercard: Costco.com only. If Visa: all locations. If Discover: not accepted anywhere at Costco.

❌ In-Store Declined Capital One Savor Cash Rewards Credit Card Mastercard Network (transitioning to Discover)

Declined at Costco warehouses and gas stations. Accepted on Costco.com only. Earns 3% cash back on dining, entertainment, and grocery stores (note: Costco is a warehouse club, not classified as a grocery store — typically earns 1% at Costco). TheStreet (Mar 2026) confirms new Savor cards are being issued on the Discover network, which is not accepted anywhere at Costco.

❌ In-Store Declined Capital One SavorOne Cash Rewards Credit Card Mastercard Network (transitioning to Discover)

Declined at Costco warehouses and gas stations. Accepted on Costco.com and the Costco app. SimpleFastLoans confirms the SavorOne as a Mastercard option for Costco.com purchases. Same transition notice applies: new SavorOne cards may arrive on the Discover network per TheStreet (Mar 2026) — check your card’s logo.

❌ In-Store Declined Capital One Platinum Credit Card Mastercard Network

Declined at Costco warehouses and gas stations. Accepted on Costco.com only. WalletHub confirms this card is a Mastercard. No cash back or rewards on purchases. Primarily a credit-building card — using it for Costco shopping earns no meaningful rewards regardless of where it is accepted.

⚠️ Check Your Card Capital One VentureOne Rewards Credit Card Usually Mastercard (transitioning to Discover)

Most VentureOne cards are Mastercard — declined in-store at Costco; accepted on Costco.com. TheStreet (Mar 2026) includes VentureOne among cards transitioning to the Discover network for new issuances. Check the logo on your physical card before using it at Costco.

⚠️ Check Your Card Capital One Spark Business Cards Mastercard Network (not transitioning to Discover)

Capital One Spark business cards are Mastercard and are declined in-store at Costco. Doctor of Credit (Mar 2026) confirms Spark business cards are not part of the Discover network transition. Accepted on Costco.com and the Costco app for online business purchases.

Sources: WalletHub (Quicksilver Mastercard declined; Quicksilver Visa accepted, updated 03/17/2026; Venture X is Visa; Venture usually MC; Platinum is MC; Jan 2026); TheStreet Mar 2026 (Venture/Savor/Quicksilver/VentureOne/SavorOne/QuicksilverOne → Discover; Venture X stays Visa; Spark stays MC; business cards not transitioning); DoctorOfCredit Mar 5, 2026 (Capital One confirmed Discover for new branded cards; premium/business unchanged); UpgradedPoints (Venture X best non-Citi card at Costco; 3.6% effective return); SimpleFastLoans (SavorOne MC for Costco.com); Costco Official (Mastercard online; Visa in-store)

📋 Quick Reference — All Capital One Cards at Costco

Capital One Card	Network	In-Store	Costco.com	Gas Pump
Venture X	Visa	✅ Yes	✅ Yes	✅ Yes
Quicksilver (Visa version)	Visa*	✅ Yes	✅ Yes	✅ Yes
Quicksilver (Mastercard)	Mastercard	❌ No	✅ Yes	❌ No
Quicksilver (new — Discover)	Discover†	❌ No	❌ No	❌ No
Venture (Visa version)	Visa*	✅ Yes	✅ Yes	✅ Yes
Venture (Mastercard)	Mastercard	❌ No	✅ Yes	❌ No
VentureOne	Mastercard†	❌ No	✅ Yes	❌ No
Savor	Mastercard†	❌ No	✅ Yes	❌ No
SavorOne	Mastercard†	❌ No	✅ Yes	❌ No
Platinum	Mastercard	❌ No	✅ Yes	❌ No
Spark Business Cards	Mastercard	❌ No	✅ Yes	❌ No
Capital One Debit Card	Discover (new)	⚠️ PIN only	✅ Yes	⚠️ PIN only

✅ = Accepted ❌ = Declined ⚠️ = Conditional — check PIN-debit routing. *Some applicants receive Visa; others receive Mastercard — check the logo on your specific card. †Newer cards being transitioned to Discover network as of Feb–Mar 2026. Sources: Costco Official (03/02/2026); WalletHub (03/17/2026); TheStreet & DoctorOfCredit (Mar 5, 2026).

🔔 Important: Capital One’s Discover Network Transition

🚨 Breaking — Affects Your Card’s Costco Access

As of March 2026, Capital One has confirmed it is migrating several of its consumer-branded credit cards from Visa and Mastercard to the Discover payment network — the result of Capital One’s $35.3 billion acquisition of Discover Financial Services, completed in 2025. This is the most significant change to Capital One’s card portfolio in years, and it directly affects whether your card will work at Costco.

🔄 Cards Moving to Discover

6 Card Lines

Venture, Savor, Quicksilver, VentureOne, SavorOne, and QuicksilverOne branded cards are being issued on Discover for new applicants as of Feb–Mar 2026. Discover is not accepted at Costco anywhere.

✅ Staying on Visa

Venture X

The Capital One Venture X Rewards Credit Card is confirmed to remain on the Visa network. It will continue to work at all U.S. Costco warehouses, gas stations, and on Costco.com.

📅 Timing for Existing Cardholders

At Renewal

Existing cardholders are generally not affected until their current card expires and is replaced. New applicants from Feb 2026 forward receive Discover-network cards. You will receive a notification when your card transitions.

🏦 Debit Card Transition

In Progress

Capital One has been replacing 25+ million debit cards with Discover-network versions since mid-2025. Expected to complete by end of 2026. Discover debit cards may still process as PIN-debit at Costco — but confirm before relying on it.

💡 What You Should Do Right Now If You Have a Capital One Card

Check your card’s network logo today. Turn your card over and look at the bottom-right corner. If you see “Visa” — you are set for Costco. If you see “Mastercard” — works online only. If you see “Discover” — does not work at Costco anywhere.
If you received a new or replacement Capital One card recently, check before your next Costco trip. New cards issued from February 2026 forward may carry the Discover logo rather than Mastercard. Do not assume your replacement card works the same way as your old one.
If Costco is important to you and your Capital One card is transitioning away from Visa, consider whether the Venture X is right for you. The Venture X remains on Visa and earns strong rewards. Alternatively, any Visa credit or debit card from any bank works at Costco — you do not need a specific card.

Sources: TheStreet “Capital One Foreshadows Changes to Select Credit Cards” (Mar 2026) — Venture/Savor/Quicksilver/VentureOne/SavorOne/QuicksilverOne moving to Discover; Venture X stays Visa; Spark stays MC; DoctorOfCredit (Mar 5, 2026) — Capital One confirmed new cards on Discover; premium unchanged; 25 million debit cards transitioning since mid-2025; Doctor of Credit update notation confirms TheStreet reporting

💡 If Your Capital One Card Doesn’t Work In-Store — Your Options

Not having a Visa card at Costco is a very common situation. Here are the most practical alternatives, ranked from most to least convenient for seniors.

✅ Option 1: Use a Visa Debit Card From Your Checking Account

The simplest fix. Check whether your bank or credit union debit card has a Visa logo. Most free checking accounts issue Visa debit cards. If yours does, it works at every Costco checkout and gas pump with no extra steps. You are spending money you already have — no credit card, no interest, no annual fee. For seniors on fixed incomes, a Visa debit card is the most straightforward, no-risk solution. If your current debit card is Mastercard-branded, it also works as PIN-debit at Costco — just enter your PIN at the keypad.

✅ Option 2: Use a Costco Shop Card (Prepaid Gift Card)

A Costco Shop Card can be purchased at any Costco warehouse with cash or a Visa card, or on Costco.com using Visa or Mastercard. Once loaded, it works at every Costco in-store checkout, at gas pumps, and on Costco.com. For seniors who want to pre-budget a Costco trip, loading a Shop Card in advance with the exact amount you plan to spend is both practical and protective — you cannot accidentally overspend. Shop Cards do not expire and carry no fees.

✅ Option 3: Pay With Cash In-Store

Cash is accepted at all U.S. Costco warehouse checkouts. It is not accepted at gas pumps or on Costco.com. For seniors who prefer to pay with cash for large grocery or household purchases, withdrawing the right amount at a free ATM before your trip eliminates any checkout complications entirely. No network restrictions, no declined cards, no workarounds needed.

✅ Option 4: Apply for a No-Annual-Fee Visa Credit Card Just for Costco

If you shop at Costco regularly, adding a simple Visa credit card to your wallet eliminates the payment problem permanently. Many Visa credit cards have no annual fee and earn 1% to 2% back on all purchases. You do not need the Costco co-branded card — any Visa from any issuer works. Good no-annual-fee Visa options include the Chase Freedom Unlimited (1.5% back), Wells Fargo Active Cash (2% back), and Venmo Visa (3% at Costco). For seniors with good credit who pay their balance in full each month, adding a free Visa card is the cleanest long-term solution.

Sources: Costco Official (Shop Cards accepted in-store, online, and at gas; cash in-store only; PIN debit any network); BGR Feb 2026 (Wells Fargo Active Cash 2% Visa; Venmo Visa 3% at Costco; Chase Freedom alternatives); FinanceBuzz Feb 2026 (Chase Freedom Unlimited at Costco); SimpleFastLoans (cash at warehouses; Shop Card workaround)

❓ Capital One at Costco — Questions Answered Plainly

💡 I Have the Capital One Venture X. What Rewards Do I Earn on Costco Purchases?

The Capital One Venture X earns 2 Capital One miles per dollar on all purchases, including every Costco warehouse purchase, Costco.com order, and Costco gas fill-up. Capital One miles are valued at approximately 1.8 cents each when redeemed for travel — giving an effective return of roughly 3.6% on Costco spending. That is higher than the Costco Anywhere Visa Card by Citi’s 2% cash back on Costco purchases. The Venture X also earns 10x miles on hotels and rental cars through Capital One Travel, and 5x on flights through Capital One Travel. If you also use Costco Travel for vacation packages, combining those bookings with the Venture X and Capital One Travel maximizes your mile-earning across both platforms.

💡 I Got a New Capital One Card Recently and It Has a Discover Logo. What Do I Do at Costco?

A Capital One card with a Discover network logo is not accepted at Costco — in-store, at the gas pump, or on Costco.com. This is a direct result of Capital One’s ongoing transition of branded cards to the Discover network following its acquisition. For now, your most practical options are: use your bank debit card (Visa or Mastercard-branded for PIN-debit) instead; load a Costco Shop Card in advance using a Visa or Mastercard you have access to; or use cash at in-store checkouts. If Costco is part of your regular routine, you may want to evaluate the Capital One Venture X (stays on Visa) or any no-annual-fee Visa from your bank as a dedicated Costco card going forward.

💡 Will Costco Ever Start Accepting Discover Cards If Capital One Is Now the Parent Company?

This is one of the most-discussed questions in personal finance circles as of early 2026 — and the honest answer is: unknown, but not currently planned. Costco’s exclusive Visa contract is a carefully negotiated business arrangement tied to Visa’s willingness to accept below-market interchange fees. Discover would need to offer Costco comparable or better terms to displace or supplement Visa. There has been no public announcement from either Costco or Capital One that Discover acceptance at Costco is planned or imminent. TikTok and social media have circulated rumors about this, but as of March 2026, no official change is confirmed. The safest assumption is that Visa is the only accepted credit network at Costco for the foreseeable future. Check Costco’s official customer service page at customerservice.costco.com if you want the most current payment policy.

Sources: UpgradedPoints (Venture X 2x miles; 3.6% effective return; transfer partners); Capital One Official (Venture X benefits; miles valuation); TheStreet/DoctorOfCredit Mar 2026 (Discover transition confirmed; no Costco acceptance announcement); TikTok (Costco Capital One merger rumors noted — not confirmed by either company); Costco Official (customerservice.costco.com — authoritative source for current payment policy)

🚀 Next Steps

Check the logo on your Capital One card right now. If it shows Visa — you are all set. If not, the options below give you a path forward for your next Costco trip.

💳 Capital One Venture X — The Only Capital One Card That Works In-Store 🏬 Costco’s Official Current Payment Policy Page 🎁 Buy or Check a Costco Shop Card — Works With Any Payment 🔍 Compare All Capital One Cards — Check Network Before Applying

✅ Five Things to Know Before Your Next Costco Trip With a Capital One Card

Turn your card over and find the network logo today — before you get to Costco. Visa = works everywhere at Costco. Mastercard = works on Costco.com only. Discover = not accepted anywhere at Costco. The card name (Quicksilver, Venture, Savor) does not tell you — only the logo on the back of your physical card does.
If your card is in transition to Discover, do not rely on it at Costco without a backup. Capital One is moving several card lines to the Discover network as of early 2026. If you recently received a new or replacement card, verify its network before your next shopping trip. Have cash or a PIN-debit card as backup.
The Venture X is the safest Capital One card for Costco shopping going forward. It is confirmed on the Visa network, earns 2x miles on all purchases including Costco, and is not part of the Discover transition. If you want a single Capital One card that works reliably at Costco, the Venture X is the one.
A Visa debit card from your checking account solves the problem immediately with no new card needed. Check whether your bank debit card has a Visa logo — if it does, it works at every Costco checkout and gas pump without any credit card required.
Costco.com accepts all Capital One Mastercard cards — shop online if in-store is not an option. If you have a Quicksilver, Savor, SavorOne, or Mastercard Venture, you can use it on Costco.com for groceries, household supplies, electronics, and Costco Travel bookings — just not in the physical warehouse.

© BudgetSeniors.com — This guide is independently researched and written. We are not affiliated with, compensated by, or endorsed by Capital One, Costco, Visa, Mastercard, or Discover. Card network assignments are subject to change — always check the logo on your physical card and confirm current Costco payment policy at Costco’s official customer service page before shopping.

Primary sources: Costco Official Customer Service (customerservice.costco.com, published 03/02/2026) — Visa only in-store; Mastercard Costco.com only; PIN-debit most networks; WalletHub “Can I Use Capital One Quicksilver at Costco?” (updated 03/17/2026) — Mastercard declined in-store; Quicksilver Visa accepted; WalletHub “Best Capital One Visa Credit Cards” (Jan 20, 2026) — Venture X is Visa; Venture usually MC; Platinum is MC; UpgradedPoints “8 Best Credit Cards for Costco” (Mar 2026) — Venture X best non-Citi at Costco; 2x miles; 3.6% value; FinanceBuzz “Best Credit Cards for Costco” (Feb 26, 2026) — Mastercard Costco.com confirmed; BGR “Best Cards for Costco Cash Back” (Feb 17, 2026) — Capital One not accepted in-store explicitly stated; JohnnyJet “What Credit Cards Does Costco Accept?” (Jul 2025, updated Mar 2026) — mobile pay Mastercard fails at Costco; TheStreet “Capital One Foreshadows Changes to Select Credit Cards” (Mar 2026) — Venture/Savor/Quicksilver/VentureOne/SavorOne/QuicksilverOne → Discover; Venture X stays Visa; Spark stays MC; DoctorOfCredit “Is Capital One Moving Cards to Discover?” (updated Mar 5, 2026) — confirmed Discover transition; 25M debit cards replaced; premium/business unchanged; Capital One Official (capitalone.com — Venture X Visa; Quicksilver Mastercard; Savor/SavorOne Mastercard); SimpleFastLoans (SavorOne MC for Costco.com; Shop Card workaround)

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