The Minimum-Payment Trap, With the Math

What the minimum payment actually is

The minimum payment on your statement isn't a fixed dollar amount — for most Canadian credit cards it's calculated as a small percentage of your outstanding balance each month, often in the range of 1-3%, sometimes with a flat minimum floor (say, $10) built in for very small balances. The exact formula is set by your card issuer and is spelled out in your cardholder agreement, so it's worth checking yours directly rather than assuming it matches someone else's card.

Because the minimum is a percentage of the balance, it shrinks in dollar terms as your balance shrinks. That sounds like progress, but it means the payment is always chasing a moving, shrinking target — which is the whole mechanism behind the trap.

The math, worked through

Here's an illustrative example using round numbers. Say you have a $2,000 balance on a standard credit card charging 20% annual interest (a common ballpark for standard cards, but confirm your own rate — rates vary by issuer and card type), and the minimum payment is set at 2% of the balance each month.

If you pay only that minimum, month after month, here's roughly what happens under these assumptions:

• After 5 years of on-time minimum payments, you'd still owe around $1,600 — about 82% of the original $2,000.
• After 10 years, you'd still owe around $1,340 — about 67% of the original balance.
• Over those same 10 years, you'd have made roughly $3,960 in total payments on that one $2,000 balance — with about $3,300 of that being pure interest, not principal.

That's the core of the trap: your payment is calibrated to slightly outpace the interest charge, so the balance does inch downward, but so slowly that most of every payment for years is just covering interest that piled up since the last one. Change any of the assumptions — a higher rate, a lower minimum percentage — and the timeline stretches even further. A loan payment calculator can show you the exact math for your own balance and rate.

Why the trap is worse than it looks

Interest on credit cards compounds, usually daily or monthly, which means interest gets charged on interest that's already accumulated, not just on your original purchases. The math above assumes you stop adding new charges entirely — in real life, many people keep using the card while carrying a balance, which resets the clock on paying it off and adds fresh interest on top.

There's also an opportunity cost that doesn't show up on the statement. Every dollar going toward years of interest is a dollar that isn't going into a TFSA, an RRSP, an FHSA, or simply toward being debt-free sooner. The gap between what you'd pay in interest versus what that same money could grow into if invested is often the real cost of the minimum-payment habit.

How to get out of it

The single biggest lever is paying more than the minimum, even a modest amount more, because extra dollars go straight to principal rather than being absorbed by the shrinking-minimum treadmill. Committing to a fixed dollar payment each month — rather than whatever the statement says is the minimum — turns a decades-long payoff into a matter of months or a few years, depending on the balance and rate.

• If you're carrying balances on more than one card, paying off the highest-interest-rate card first (sometimes called the avalanche method) minimizes total interest paid.
• Some people prefer paying off the smallest balance first for the psychological win (the snowball method) — mathematically slower, but it can build momentum that keeps you consistent.
• If a lower-rate option is available to you, such as a line of credit or a consolidation loan, moving the balance there can cut the interest cost substantially, but always compare the actual rate, fees, and terms rather than assuming any offer is the best fit for your situation.

Whatever method you use, the goal is the same: stop letting the balance dictate the payment, and start letting a firm payment dictate how fast the balance disappears.

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