What is Interchange Pass-Through for Canadian Merchants? (2026 Cost Data)

Interchange pass-through pricing in Canada is a transparent credit card processing model that breaks every transaction into three distinct costs: wholesale card network interchange fees, card network assessment fees, and a fixed processor markup. Wholesale interchange fees are baseline rates established by networks like Visa and Mastercard that go to card-issuing banks, such as Visa's 0.77% small merchant rate for consumer electronic payments. Card network assessment fees cover system maintenance, including the 0.1017% acquirer assessment fee imposed in Canada by Visa and Mastercard. The processor then applies a fixed markup that remains constant regardless of the card type processed.

While flat rates look simple on a statement, they obscure your underlying costs. Merchants on flat-rate plans pay the same high percentage on low-cost debit transactions as they do on premium reward cards. Flat-rate providers keep the difference whenever wholesale card costs drop. Pass-through structures achieve true rate parity by aligning your out-of-pocket expenses with the actual wholesale cost of each transaction.

Under this structure, also known as interchange-plus, you pay the exact network cost plus a defined margin. When a customer pays with a basic consumer card or networks lower wholesale rates, those savings hit your bank account rather than inflating processor profits.

Comparing interchange pass-through pricing to flat-rate processing exposes stark differences in cost transparency and margin stability for Canadian merchants. Pass-through providers such as Moneris and Helcim separate network costs from processor margins. Moneris Simplified Pricing charges wholesale interchange at cost, network assessment fees at cost, and a clear 0.4% transaction fee. Helcim Interchange Plus charges wholesale interchange at cost alongside a card-present margin of 0.4% + CA$0.08 or an online margin of 0.5% + CA$0.25.

Flat-rate payment processors like Square simplify billing by charging a predictable, blended percentage across card types regardless of actual wholesale cost. Square Payments in Canada on the Standard plan charges an in-person card rate of 2.65% + CA$0.10 and an online card rate of 2.9% + CA$0.30. Moneris Flat Rate Pricing similarly charges a card-present rate of 2.65% + CA$0.10 and a card-not-present rate of 2.85% + CA$0.30.

Interchange pass-through pricing delivers lower effective rates and clear dollar savings compared to flat-rate models across typical Canadian sales volumes and payment mixes. For a business processing CA$10,000/month in card volume with a CA$50 average sale (200 transactions/month, 60% credit and 40% debit), Moneris Simplified Pricing card-present costs CA$194/month, or CA$2,328/year, resulting in a 1.94% all-in effective rate. In comparison, Square Standard card-present costs CA$285/month, or CA$3,420/year, reflecting a 2.85% all-in effective rate. Choosing Moneris pass-through over Square card-present saves the merchant CA$1,092 per year.

Across all analyzed processing options for this CA$10,000/month profile, the total annual spread between the cheapest option (Moneris Simplified Pricing card-present at CA$2,328/year) and the most expensive option (Square Standard online at CA$350/month or CA$4,200/year) reaches CA$1,872/year. Comparing Helcim vs Moneris for online processing shows Helcim Interchange Plus costs CA$254/month or CA$3,048/year (2.54% effective rate), which also beats Moneris Flat Rate Pricing online at CA$287/month or CA$3,444/year (2.87% effective rate).

At a higher sales volume of CA$25,000/month with a CA$50 average sale (500 transactions/month, 60% credit and 40% debit), Moneris Simplified Pricing card-present totals CA$485/month or CA$5,820/year (1.94% effective rate), while Helcim Interchange Plus card-present costs CA$525/month or CA$6,300/year (2.1% effective rate). By contrast, Square Standard card-present totals CA$712.50/month or CA$8,550/year (2.85% effective rate), and Square Standard online reaches CA$875/month or CA$10,500/year (3.5% effective rate). The spread between the cheapest and most expensive plans at this volume expands to CA$4,680/year. Because Moneris Simplified Pricing card-present carries no extra fixed monthly subscription fee and runs a 1.94% marginal rate compared to Square Standard card-present's 2.85% rate, pass-through pricing is cheaper at every volume level with this mix.

Canada's payment card market structurally favors pass-through pricing thanks to fixed-fee Interac debit rates and preferential credit card interchange tiers. Interac Flash interchange fees are structured as flat cents-per-transaction amounts rather than percentage-based rates, ranging from CA$0.0200 for Tier 1 up to CA$0.0550 for Tier 4 transactions over $100. Effective November 1, 2026, the Interac Debit switch fee will increase to CA$0.0163 per transaction. When a customer pays with an Interac debit card, the wholesale network cost remains a few cents regardless of purchase size.

Flat-rate processing structures apply standard percentage rates across all transactions, absorbing the low wholesale debit cost while collecting heavy percentage fees from the merchant. Pass-through models pass these underlying network savings directly to the business owner, ensuring debit transactions incur minimal wholesale charges.

Canadian merchants also benefit from targeted credit interchange programs established by the card networks. Visa's published tables include a consumer electronic small merchant interchange rate of 0.77%, whereas card-not-present premium credit cards like Visa Infinite Privilege CNP carry small merchant rates of 2.3%. Pass-through pricing ensures small merchants automatically capture lower rates like 0.77% on standard consumer cards rather than paying a high, unvarying blended rate.