Every card payment your business accepts carries a cost, and in Canada that cost is built from the same few layers: interchange paid to the cardholder's bank, network or assessment fees paid to the card brand, and the processor's markup for moving the money to you. Interac debit works differently again, usually with a flat amount per transaction rather than a percentage.
The guides in this section take those layers apart, compare the four common pricing models (flat rate, interchange-plus, tiered and subscription), and explain the rules that shape your bill as of October 2026: the revised Code of Conduct for the Payment Card Industry in Canada in effect since 30 October 2024, the Visa and Mastercard small business interchange reductions from 19 October 2024, the conditions for adding a credit card surcharge (and why you cannot in Quebec), and how GST/HST applies to fees and equipment.
Start with the overview of merchant processing fees in Canada, then go to the guide that matches your question. Every rate in these guides is an illustrative example unless a source and date are given next to it. To turn the explanations into your own numbers, use the card fee calculator.