Interchange plus for Canadian small businesses in 2026: The math

Interchange-plus pricing splits total transaction fees into wholesale network costs and a fixed processor markup. Payment card networks set interchange fees, which acquirers pay to card issuers on every transaction. The processor charges the underlying network rate plus an agreed fee per transaction, such as Helcim's card-present markup of 0.4% + CA$0.08 or Moneris's Simplified Pricing markup of 0.4%.

Unlike flat-rate models that merge costs into a single static rate, interchange-plus passes all network fee shifts directly to you. This creates true rate parity—what you pay reflects the actual cost of the card. Across the statements we analyze, this model ensures that wholesale card fee reductions immediately lower your total costs, rather than padding the processor's margin.

Flat-rate pricing charges a predictable percentage regardless of wholesale shifts, whereas interchange-plus passes low wholesale rates along to you. A flat-rate provider like Square charges 2.65% + CA$0.10 for in-person transactions on its Standard plan. While this simplifies accounting, the processor absorbs all savings when wholesale card costs drop.

Interchange-plus exposes lower wholesale tiers directly to the merchant. Visa's published table lists the Consumer Electronic Small Merchant tier at 0.77%. On an interchange-plus plan, you pay that exact 0.77% interchange rate plus your processor's fixed fee. This secures significantly lower overall costs than flat-rate alternatives.

Comparing Helcim vs Moneris alongside Square across real transaction volumes proves interchange-plus provides lower fees than flat-rate processing. We analyze a CA$10,000 monthly volume with a CA$50 average sale across 200 transactions, split 60% credit and 40% debit. Moneris Simplified Pricing card-present costs CA$194/month or CA$2,328/year. This represents a 1.94% all-in effective rate based on a 1.54% average credit interchange plus the 0.4% markup.

Helcim Interchange Plus card-present costs CA$210/month (CA$2,520/year) at a 2.1% effective rate. Helcim online runs CA$254/month (CA$3,048/year) at 2.54%. Square Standard card-present costs CA$285/month (CA$3,420/year) at 2.85%. Moneris Flat Rate Pricing online costs CA$287/month (CA$3,444/year) at 2.87%, with debit at CA$1 per transaction. Square Standard online peaks at CA$350/month (CA$4,200/year) at 3.5%. The total spread between the cheapest and most expensive option is CA$1,872/year.

At a higher volume of CA$25,000/month using the same card mix, Moneris Simplified Pricing card-present costs CA$485/month (CA$5,820/year) at a 1.94% effective rate. Helcim card-present costs CA$525/month (CA$6,300/year) at 2.1%, while Helcim online costs CA$635/month (CA$7,620/year) at 2.54%. Square Standard card-present costs CA$712.50/month (CA$8,550/year) at 2.85%. Moneris Flat Rate online costs CA$717.50/month (CA$8,610/year) at 2.87%, and Square online hits CA$875/month (CA$10,500/year) at 3.5%. The spread reaches CA$4,680/year.

When you compare Moneris vs Square, Moneris Simplified Pricing beats Square Standard card-present at every volume level under this mix. Moneris carries a lower marginal rate of 1.94% versus 2.85% and adds no monthly fixed fees.

The Canadian federal government mandated fee reductions starting October 19, 2024. These rules lower domestic consumer credit interchange fees for qualifying small businesses to an annual weighted average of 0.95%. Merchants qualify if their annual sales volume sits below $300,000 for Visa and $175,000 for Mastercard, evaluated between April 1, 2023, and March 31, 2024. Online domestic consumer credit interchange fees also dropped by 10 basis points, creating savings up to 7%. Over 90% of credit card-accepting businesses qualify, generating total fee cuts of up to 27%.

An updated Code of Conduct for the Payment Card Industry in Canada took effect October 30, 2024, ensuring businesses receive these reductions. The revised code requires payment processors to pass savings on or notify merchants. It shortens complaint response times to 20 business days. It also permits small businesses to terminate contracts without penalty if their payment processor fails to pass on the full fee reductions.

Interchange-plus pricing separates low-cost Interac debit transactions from credit card processing. Percentage-based flat-rate pricing often applies a higher percentage fee regardless of payment type. Under percentage-based debit structures like Square Standard, debit payments incur the full 2.65% + CA$0.10 rate in-person. As analyzing the Square Canada processing fee changes in 2026 reveals, this treats low-cost debit identically to higher-risk credit products.

Other providers utilize flat per-transaction debit structures rather than percentage billing. Moneris Flat Rate Pricing charges a fixed per-transaction debit fee of CA$0.12 for card-present sales and CA$1 for card-not-present sales. Choosing a structure with explicit per-transaction debit pricing prevents you from paying unnecessary percentage markups on Canadian debit volume.