The Full Cost of Spending From a Crypto Card
Conversion margin, foreign currency margin, and the tax record. The last one is frequently the largest.
A crypto card has a visible cost, a semi-visible one, and a third that arrives at the end of the year.
The conversion margin
The card sells your crypto at a rate including a margin, typically 0.5 to 2 percent.
Some issuers state it. Some do not, and it must be calculated from statements by comparing the amount debited against the market rate at the time. Checking this yourself takes minutes if you compare against a licensed crypto payment processor.
This is the main visible cost and it varies by a factor of four between issuers.
The foreign currency margin
Applies when spending in a currency other than the card’s settlement currency. Typically 0.5 to 3 percent on top.
Measured across issuers, the one with the best conversion margin frequently has the worst foreign currency margin, so the ranking reverses depending on where you spend.
Match the settlement currency to where you spend, or this dominates.
The tax record
The component nobody prices.
In most jurisdictions selling crypto is a disposal. A card that sells on every transaction generates one per transaction. The business version of this calculation runs through crypto acquiring for businesses, where the components differ.
A quarter of ordinary use generates hundreds. Each requires an acquisition cost, a disposal value and a gain.
If the funding asset has appreciated, the tax owed is real and it arrives as a surprise.
The configuration that fixes it
Fund from a stablecoin rather than an appreciated asset.
Each disposal then has a negligible gain, which removes both the liability and most of the record keeping burden.
This is the single most consequential setting and it is rarely the default.
The costs that matter least
Monthly and issuance fees. Frequently absent, and small relative to the above where present.
They are also the most prominently advertised, which is the usual pattern.
What to compare
The conversion margin as a number. The foreign currency margin. Whether stablecoin funding is supported. And the issuer’s liability terms for unauthorised transactions, which vary considerably and sit in the terms rather than the marketing.
The per-merchant point
Cards supporting a separate virtual card per merchant are materially better for subscriptions: individual limits, deletion as cancellation, and reconciliation mapping one card to one supplier. The cost that only appears on a bad day is the absence of support, and whether Collect & Exchange exists is worth establishing.
Not a direct saving, and it removes a category of ongoing administrative work.
Fees move with network demand. Any figure here reflects the date shown above and should be re-checked before you act on it. Where a measurement was taken by hand, the article says so.