Why minimum payments take so long
A minimum payment is often calculated to cover interest plus a small slice of the balance. On a 20,000 balance at 20 percent annual interest, the monthly interest alone is roughly 20,000 multiplied by 20 percent divided by 12, which comes to about 333 in the first month. A 500 payment reduces the balance by only 500 minus 333, which is 167 — meaning most of the payment is servicing interest rather than shrinking what you owe.
Avalanche: cheapest in money
List debts by interest rate, highest first. Pay minimums on everything, and send every extra amount to the top of the list. Mathematically this always costs the least in total interest, because the most expensive balance shrinks fastest, which is where the interest charges are largest per rand or pound owed.
Snowball: cheapest in willpower
List debts by balance, smallest first. Clearing an entire debt early produces visible progress and frees its payment for the next one. It costs slightly more interest, and it is the better choice if motivation is the binding constraint, since finishing an account completely tends to sustain momentum better than a slowly shrinking large balance.
The extra payment effect
On a 30,000 balance at 18 percent, paying 1,000 a month clears it in roughly 43 months with around 12,700 in interest. Raising the payment to 1,400 clears it in about 27 months with roughly 7,300 in interest — the same debt, materially cheaper. The extra 400 a month, only 27 percent more than the original payment, cuts the payoff time by about 16 months and the total interest by roughly 5,400.
A worked comparison of avalanche versus snowball
Imagine two debts: Card A has a 5,000 balance at 24 percent interest, Card B has a 12,000 balance at 14 percent. Under avalanche, extra payments go to Card A first because 24 percent is the higher rate, clearing the more expensive debt sooner and saving more interest overall. Under snowball, extra payments go to Card A first anyway in this case because it also happens to be the smaller balance — but if Card A were the 12,000 balance instead, snowball would target Card B first purely for its smaller size, even though it carries the lower rate, costing more in total interest for the sake of an earlier win.
Protect the plan
- Keep a small emergency buffer so a surprise does not go back on the card.
- Remove stored card details from shopping accounts you use out of habit.
- Recalculate every few months rather than every week.
- When one debt clears, roll its payment into the next instead of absorbing it.
Common mistakes in debt repayment
- Paying only minimums for years without realising how much of each payment is interest.
- Consolidating debt without changing the spending habits that created it.
- Closing a paid-off account immediately, which can affect available credit and credit history.
- Ignoring a debt that has genuinely become unaffordable instead of seeking help early.
What to do next
If a debt is genuinely unaffordable — the minimums exceed what you can pay — speak to the credit provider or a registered debt counsellor early. Options are far wider before an account goes into default. If your debts are manageable, pick avalanche or snowball this week, automate the extra payment, and recalculate the full plan every three to four months as balances shrink.
Further reading and practical resources
These independent resources help you check the concepts and take the next step. They have not reviewed or endorsed Budgeter. Examples in this guide are illustrative, not observed customer results; check local rules and your provider's terms.
- Debt collection: understand your options and rights
US Consumer Financial Protection Bureau. The practical record-keeping guidance is useful generally; the legal rights described apply in the US.
- Credit reports and scores: what they mean and how to check them
US Consumer Financial Protection Bureau. Scoring systems, reporting agencies and dispute procedures differ by country.