--- title: "Debt Payoff Calculator (NZ) — Avalanche vs. Snowball | DecisionsCalc" url: https://decisionscalc.com/nz/tools/debt-payoff-calculator/ description: "Enter your debts once and compare avalanche vs. snowball side-by-side — exact interest saved, months to debt-free, and your payoff order. NZ figures in $." publisher: DecisionsCalc note: General information, not financial, tax or legal advice. Figures name their source and the date they were read. --- [NZ · figures as of 2026-11](https://decisionscalc.com/methodology/) Figures checked 7 Nov 20263 figures in our [register](https://decisionscalc.com/methodology/#figure-register)Next review 12 Dec 2026[Report an error](mailto:hello@decisionscalc.com?subject=Possible%20error%20on%20%2Fnz%2Ftools%2Fdebt-payoff-calculator%2F) Starting Out # Debt Payoff Calculator Enter your debts in the table below — name, balance, APR, and minimum payment. The calculator instantly shows which payoff strategy saves the most interest and when you'll be debt-free. Results update as you type Up to 8 debts Avalanche vs. Snowball comparison Your Debts Enter each debt on one row | Debt name (credit card, loan…) | Balance | APR % | Min. payment | | | --- | --- | --- | --- | --- | 3 of 8 debts entered Payoff Acceleration Optional — speeds up payoff $ Every extra payment goes to the target debt, cutting both the interest and the time to debt-free. The income tax rate on the top slice of your income. ### Debt Payoff Schedule ## Avalanche costs less; snowball gets finished The **avalanche** method pays the highest interest rate first and is mathematically optimal — it always costs the least in total interest and is usually fastest. The **snowball** method pays the smallest balance first, which costs slightly more but clears individual debts sooner. The case for snowball is not financial, it is behavioural: people are measurably more likely to keep going when they can see accounts disappearing. If the difference between the two in your case is small — and with similar rates it often is — the one you will actually finish is the better one. If one debt carries a far higher rate than the rest, that argument weakens and avalanche is worth the discipline. ## Do this first, whichever method you pick Before optimising the order, check whether the rate itself can be moved. A balance transfer at 0% for a fixed period, or a consolidation loan at a lower rate, changes the arithmetic more than any repayment ordering can. Two things to watch: the transfer fee, typically 2–4% up front, and what the rate becomes when the promotional period ends. The trap is well documented. A transfer only helps if the balance is actually cleared within the promotional window and the original card is not used again in the meantime. Otherwise it relocates the debt and adds a fee. ## Pay off debt, or invest? Compare the interest rate against the return you could reasonably expect, and remember that clearing debt is a **guaranteed** return while an investment is not. At credit-card rates there is no contest. Below roughly 5–6% the case for investing instead gets real, particularly inside a tax-advantaged account or where an employer matches contributions — an employer match is an immediate return that almost no debt rate beats. Mortgages usually sit at the bottom of the priority list: the rate is comparatively low, and the balance is secured against an asset. ## What this model assumes - **Rates stay put.** Variable rates move, and promotional rates expire on a date worth having in a diary. - **Payments are made on schedule.** A single missed payment can end a promotional rate outright on many cards. - **Nothing new is added.** The most common reason a payoff plan fails is not the ordering — it is continued spending on the same accounts. - **Minimums are covered.** Whatever the strategy, every account gets at least its minimum; only the surplus is directed. **Methodology:** Monthly interest = balance × (APR ÷ 12). Avalanche: highest APR attacked first. Snowball: lowest balance first. Freed minimums roll forward to next target. Minimum payments floor at $10 or balance. Results are projections — actual payoff depends on making consistent payments. [Full disclaimer →](https://decisionscalc.com/disclaimer/) ## What changes in New Zealand - The average rate on interest-bearing credit card debt was **20.0% in July 2026** (Reserve Bank). Paying that down beats almost any investment return. - **A student loan is interest-free while you live in New Zealand**, and repayments of 12% of income above $24,128 come out of your pay automatically. Paying it off early earns nothing, so it belongs last in any payoff order. - Moving overseas changes that: overseas-based borrowers are charged interest, so the order flips if you leave. - Income tax rates are 10.5%, 17.5%, 30%, 33% and 39% (from 1 April 2025); the 30% default is the rate on income between $53,501 and $78,100, which includes the median wage. **Data reference (New Zealand):** RBNZ B3: effective credit card rate on interest-bearing debt 20.0% (July 2026); IRD: student loans interest-free for NZ-based borrowers, repayment threshold $24,128; IRD income tax rates from 1 April 2025 · figures as of 2026-11 · Rates read on 2026-11-03 against the named sources; the balances are examples. General information, not advice.. See our [methodology](https://decisionscalc.com/methodology/) for how every figure is sourced and dated. ## Get an email when New Zealand rules change Tax bands, allowances and benefit rates change every year. We email you when a rule our New Zealand calculators use changes, usually a few times a year. Confirm by email; unsubscribe in one click. Was this page useful? **Report a wrong figure or missing information**