Every guide to dynamic currency conversion is written for the traveller: always choose local currency, the markup is terrible. True — but you're the merchant holding the terminal. DCC is a revenue product sold to you: your terminal provider converts the tourist's bill into their home currency at a rate it chooses, adds a markup of 3–5% or more, and shares a slice with you. This guide covers the side nobody writes about — the economics, the rules, and whether enabling it is worth the goodwill it costs.
What DCC is from the merchant's side of the terminal
The flow: a US tourist taps their card. Your terminal detects the card's home currency differs from Canadian dollars and offers a choice — pay in CAD, or pay in USD at a converted amount. If they choose USD, the conversion happens right there at your terminal, at an exchange rate set by your acquirer's DCC provider. The card network doesn't set the rate and doesn't take a cut; Mastercard states plainly that it doesn't control DCC pricing or add fees.
The pitch to merchants is passive income: no pricing changes, no operational changes, just a share of conversion revenue on sales you'd make anyway. Providers frame it as a value-added service that also reduces chargebacks, since the customer sees the final amount and consciously accepts it.
Who sets the rate and who keeps the markup
| Party | Role in DCC | Typical take |
|---|---|---|
| DCC provider (your acquirer's partner) | Sets the exchange rate, takes the spread | The bulk of the 3–8% markup |
| You, the merchant | Offer the choice at the terminal | A revenue share — field data shows ~1% of the DCC sale |
| The tourist | Pays the markup | 3–5%+ over the live rate, vs ~2.5% issuer FX fee |
Field notes from payments observers put the merchant's share around 1% of each DCC sale — the incentive, not the total markup. The rest of the spread goes to the DCC provider. One traveller's case study recorded roughly a 7% worse outcome after a DCC conversion went through against their intent (WanderWallet field notes, September 2026) — the markup the customer actually paid dwarfed the merchant's 1% share.
The worked trade: $10,000/month in foreign-card sales. At a 5% DCC markup, tourists collectively pay $500 in markup. Your ~1% share: $100/month. The tourists pay the other $400. Same sales billed in CAD: you earn $0 from FX, and every tourist pays only their issuer's ~2.5% fee. The question isn't whether $100/month is real money — it's what it costs in customer experience.
The rules you must follow: the currency choice and disclosure
DCC is regulated by network rules, and the duties fall on you:
The choice must be genuine. Mastercard requires that the cardholder always be given the choice of currency — DCC must not be the default, and staff must not pre-select home currency. Steering the tourist, pre-tapping their choice, or burying the option violates the rules.
No permanent opt-out exists. Because DCC is performed by the merchant and acquirer — not the issuer — a cardholder can't globally disable it. Every transaction is a fresh choice, which means every transaction is a fresh compliance moment for your staff.
Some cards are off-limits. Acquirers are prohibited from offering DCC on prepaid travel cards and multicurrency debit cards. If your terminal offers it there anyway, that's a configuration problem to raise with your provider.
Decision framework: should a Canadian business enable DCC?
- Count your foreign-card share. DCC only matters if tourists are a real slice of volume — hotels, attractions, border-town retail. Under ~10% foreign cards, the revenue share won't cover the staff training.
- Price the goodwill. Your 1% share comes from a 3–5%+ markup your customer pays. In review-driven businesses (hotels, restaurants), one "they ripped me off on the exchange rate" review costs more than months of DCC revenue.
- Audit the choice flow. If you enable it, hand the terminal to the customer, make both options equally visible, and train staff never to pre-select. A non-compliant offer is worse than no offer.
- Compare with doing nothing. Billing in CAD costs you nothing, complies with everything, and the tourist pays only their issuer's ~2.5%. "Off" is a legitimate, defensible default.
- Read the revenue-share terms. Get the actual percentage in writing — "a share of conversion revenue" without a number is a promise, not a term.
A note on steps: this is a fee explainer with a decision framework, not a repair procedure — the checklist above is the actionable part. Enabling or disabling DCC is a terminal-provider setting, which differs by acquirer.
FAQ
Does DCC cost the merchant anything to offer?
Typically nothing upfront — providers activate it at no additional cost because they earn the spread. The cost is indirect: staff training, compliance risk, and customer goodwill.
Is DCC the same as the foreign transaction fee?
No. The foreign transaction fee (~2.5%) is charged by the tourist's card issuer. DCC markup (3–5%+) is charged by the merchant's DCC provider instead of letting the issuer convert — and it stacks on top of whatever the issuer charges on the converted amount.
Can a tourist avoid DCC at my terminal?
Yes — they choose local currency (CAD) at the prompt. Network rules require the choice be offered every time; they can't disable DCC globally because it's your terminal performing the conversion, not their bank.