Credit card minimum payments: the arithmetic nobody shows you
The minimum payment is calculated to keep the account alive, not to clear it. Seeing the actual numbers changes how people treat it.
The maths
Because the minimum recalculates as the balance falls, payments shrink alongside the debt and the tail stretches for years — most of what you pay in the early years is interest. Fixing your payment at today’s minimum amount, rather than letting it fall, cuts years off the term at no extra monthly cost. The budget calculator shows what a fixed figure does to your surplus.
The persistent-debt rules
Since 2018, lenders must monitor for “persistent debt” — paying more in interest, fees and charges than you repay of the balance over 18 months. At 18 and 27 months you get prompts to pay more; at 36 months the lender must propose a way to clear the balance in a reasonable period, usually 3–4 years, and must consider reducing or waiving interest if you cannot afford it. These letters are legal obligations working in your favour — answering them is how the leverage gets used.
When even the minimum strains
A minimum you cannot meet is the can’t-afford sequence, not a smaller version of this page. Say so to the lender before the payment fails, and the whole conversation happens on better terms.