Canada: 3% almost everywhere, 5% in Quebec
Canadian issuers usually set the minimum at 2% to 3% of the balance, with the month's interest taken from within that payment rather than added on top, and a flat floor of about $10 on small balances. Nothing federal fixes the percentage, so it is the issuer's own schedule and it is printed on your statement.
Quebec is the exception, and it is a large one. Consumer protection legislation there set the minimum at 5% for accounts opened from August 2019 and raised older accounts by half a point a year until they reached the same 5% of the balance on 1 August 2025, the highest statutory minimum in any market this calculator covers. On a $5,000 balance that is a first payment of $250 rather than $150, and it cuts years off the payoff without the cardholder deciding anything. If your card was issued in Quebec, set the percentage above to 5.
There is a legal ceiling on the rate, but it is a long way above what any card charges. Since 1 January 2025 the Criminal Code has set the criminal rate of interest at 35% APR, down from an effective 60% a year, and it covers credit cards along with most other consumer credit; only commercial and pawn lending are carved out. Mainstream Canadian cards sit around 20%, so what actually holds the rate down is competition rather than the Criminal Code.