Interac handles over 56% of electronic payments in Canada, and merchants love it for a simple reason: it's the cheapest way to take a payment. But "Interac" isn't one thing anymore. A customer's tap can ride the Interac chip network, Interac Flash, or — if they hold a Visa Debit or Mastercard Debit card — a hybrid that switches networks depending on where the sale happens. The rail determines the price, and the price differences are large.
The three rails a Canadian debit tap can use
| Rail | When it's used | Cost structure |
|---|---|---|
| Interac chip (PIN) | Card inserted, PIN entered | Small switch fee, no interchange — pennies per transaction |
| Interac Flash (tap) | Contactless tap under the limit | Tiered interchange: $0.020–$0.055 per tap (see below) |
| Visa Debit / Mastercard Debit | Online purchases; some in-store edge cases | Card-network interchange (percentage-based, like credit) |
The key detail merchants miss: cards carrying the Visa Debit or Mastercard Debit brand are hybrids. In-store, they ride Interac's rails. Online, the same card rides the Visa or Mastercard network and bills at card-not-present interchange — percentage-based, like a credit card. One card, two cost structures, depending on the channel.
What each tap costs: Interac Flash tiers in dollars
Interac Flash interchange is priced per tap in four published tiers:
| Tier | Who | Transactions $0.01–$100 |
|---|---|---|
| Tier 1 | Low-ticket merchants | $0.020 |
| Tier 2 | High-volume merchants | $0.025 |
| Tier 3 | All other merchants | $0.035 |
| Tier 4 | All merchants, $100–$250 transactions | $0.055 |
Two to five cents a tap. Compare that with what flat-rate processors charge for debit — commonly around $0.12 per transaction — and the margin becomes visible: on a Tier 3 tap, the provider keeps roughly eight cents of every debit sale. At 2,000 debit taps a month, that's about $170 a month in debit margin alone.
The online sting: that same customer's Visa Debit card used on your website doesn't cost $0.035 — it bills at Visa card-not-present interchange, around 1.15%+ for small merchants. A $60 online Visa Debit sale costs roughly $0.69 in interchange versus $0.035 in-store on Interac. Same customer, same card, twenty times the wholesale cost — determined entirely by the channel.
2010: the year Canada killed merchant debit routing choice
In other markets, merchants with co-badged cards can use least-cost routing — steering each debit transaction to the cheapest available network. Canada briefly had a version of this right, then lost it. The 2010 Code of Conduct for the Credit and Debit Card Industry prohibited co-badged debit cards carrying competing network applications on the same card, and explicitly removed the merchant's right to choose the lowest-cost debit option on co-badged cards.
The reasoning was practical: letting merchants pick between competing debit applications on one card created routing problems for acquirers and processors. But the consequence stands today — unlike merchants in some other countries, you cannot steer a debit transaction to the cheaper rail. The card and the channel decide; you pay whatever the routing produces.
As a Retail Council of Canada spokesman put it during the debate: retailers prefer Interac because it is a secure, low-cost form of payment, and merchants don't want the high interchange of credit payments migrating into debit. That preference is exactly what's at stake every time a debit transaction lands on a percentage-based rail instead of Interac's flat cents.
What this means for your effective rate: the decision framework
- Split your debit mix by channel. In-store debit on Interac costs cents; online debit on Visa/Mastercard rails costs percent. If your online share is growing, your debit costs are growing faster than your debit volume.
- Price your debit line separately. On flat-rate pricing, debit is billed at the credit-card percentage — the single most expensive way to take a three-cent transaction. Interchange-plus or debit-specific pricing fixes this.
- Watch the Flash tier you land in. Most independent merchants are Tier 3 ($0.035). If your processor's debit per-transaction fee is far above that, the gap is markup — it's negotiable.
- Don't chase routing you can't control. Least-cost routing doesn't exist for Canadian merchants. Spend the energy on pricing-model choice instead — that's the lever you actually hold.
A note on steps: this is an explainer, not a procedure — there are no settings to change because Canadian merchants can't choose debit routing. The framework above is the actionable part: measure the mix, price the line, and pick the pricing model that doesn't bill cents-based transactions at percent-based prices.
FAQ
Is Visa Debit the same cost as Interac?
In-store, usually yes — it rides Interac's rails. Online, no — it bills at Visa's card-not-present interchange, which is percentage-based and far more expensive per transaction.
Why can't I choose the cheapest debit network?
The 2010 Code of Conduct removed the merchant's right to choose between competing debit applications on co-badged cards, and prohibited those co-badged cards outright. The card and the channel determine the rail.
What's the cheapest way to accept debit in Canada?
Interac chip or Flash in-store at interchange-plus pricing: $0.02–$0.055 per tap plus a small markup. Flat-rate plans that bill debit at ~2.65% are the most expensive way to take debit.