Killing expensive NZ debt first: a practical order
Not all debt is equal. Some interest quietly drains your pay packet every month; some is cheap enough that it mostly takes care of itself. This guide sets out the order that actually works — high-interest credit cards and personal loans first — and a weekly plan you can start tonight.
Why the order matters
Every dollar you owe charges interest, but the rate varies wildly. Your mortgage might sit in the single digits. A credit card, on the other hand, can carry a rate several times higher — and unsecured personal loans are typically not far behind. The point of choosing a payoff order is simple: pay off the debt that costs you the most per dollar first, because that's the one eating the biggest slice of your money every period.
Think of it as a row of leaking taps. The obvious move isn't to fix them in the order you'd like — it's to fix the biggest leak first. Every regular payment you can redirect to that leak does the most work it can possibly do.
This is about expensive vs cheap debt, not good vs bad debt. Cheap debt — a low-interest or interest-free student loan, a mortgage at a low fixed rate — normally keeps its minimum repayment while your higher-rate debt gets the extra money. Paying down a 3% loan while a 20% card still sits open saves you far less than doing it the other way.
The debt order, from first to last
A sensible, general order for New Zealand borrowers tends to look like this. Rates change over time, so rank by your actual rates, not by the label alone.
| Priority | Debt type | Why it sits here |
|---|---|---|
| 1 · Pay first | Credit cards (revolving balance) | Highest unsecured interest rates around, and interest accrues on the full daily balance. |
| 2 · Pay next | Unsecured personal loans, buy-now-pay-later, store cards | Still high cost, and many charge interest or fees immediately, sometimes on the full amount. |
| 3 · Then | Hire purchase / higher-rate vehicle loans | Often cheaper than cards but still more than a primary secured loan. |
| 4 · Keep minimum | Mortgage, low/fixed-rate loans, interest-free student loans | Lowest rates. Pay the minimum here so every spare dollar fights your expensive debt instead. |
The exact rates on your own accounts are what matter. This is a general ranking, not a recommendation for your specific situation — always check the rates you're actually paying, and get professional advice where it helps before restructuring anything.
Snowball vs avalanche: which should you choose?
Once you've ranked your expensive debts, you need a method for clearing them in sequence. Two are most common, and they answer a different question.
| Avalanche | Snowball | |
|---|---|---|
| Order | Highest interest rate first | Smallest balance first |
| Aims to | Minimise the total interest you pay | Maximise quick wins and motivation |
| Costs less | Usually — least interest overall | Generally more interest over the journey |
| Feels like | These are the maths | Early balance is cleared fast, a real boost |
| Best when | You can stay disciplined on the numbers | You need visible progress to keep going |
Avalanche is the financially optimal default: you pay the minimum on everything, put every spare dollar onto the highest-rate debt, and when it's gone, roll that payment onto the next highest. Because high-rate balances shrink first, you pay the least total interest over time.
Snowball orders by smallest balance instead. You get a debt gone — really gone — much sooner, which is genuinely valuable for motivation. Some people find they simply stick to it better, and a plan you complete beats an optimal one you abandon.
Neither is "wrong." If taming the biggest interest bill keeps you motivated, do avalanche and watch the numbers. If clearing the smallest balance gives you the push to keep going, snowball will carry you further than quitting would. The best method is the one you actually keep doing. And if your credit-card rates are far above everything else, both methods usually point at the same first target anyway.
Use the numbers to pick your plan
Don't guess at this. Our debt payoff calculator compares snowball and avalanche side by side using your real balances, rates and budget, and shows which clears your debts sooner and saves more interest. It's the quickest way to settle the debate for your numbers instead of a generic rule.
You'll also want an honest picture of what you can actually put toward debt each week. The weekly budget builder shows whether your spending sits inside your income, what's left over, and what you could safely commit to a payoff. A plan built on a real number beats a hopeful one built on vibes.
A practical weekly plan
Here's a repeatable weekly rhythm. It's deliberately small — the goal is to make next week look almost exactly like this one, because consistency beats heroics.
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1
Write down every debt Balance, interest rate, and minimum payment for each. One line per debt. This is your map — you can't order what you haven't listed.
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2
Pick your method Rank by rate for avalanche, or by balance for snowball. Run your numbers through the debt calculator to see the difference concretely.
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3
Set a weekly amount From your budget builder result, fix a dollar figure for extra payments on top of all minimums. Start smaller than you think you can — then it's painless to hit.
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4
Schedule it automatic Make the extra payment a recurring transfer on payday, so it leaves your account before you can spend it. Automation is the difference between a plan and a hope.
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5
Point every windfall at the target Tax refund, bonus, gifted money — a portion of any surprise goes straight to the debt you're attacking, not back into spending.
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6
Celebrate the kill, then roll it forward When a debt is gone, that freed-up payment rolls onto the next one in your order. The snowball — or the avalanche — builds its own momentum. Revisit your list once a quarter or when rates reset.
Before aggressive payoff, a genuinely useful buffer matters: a small emergency fund of a few weeks' essential expenses stops one surprise bill from dumping you back onto a card. Attack debt hard, but don't leave yourself with zero cushion. And if repayments ever feel unmanageable, pause and talk to a budgeting service or a financial adviser — there's no shame in getting help, and slowing down beats defaulting.
Frequently asked questions
Which NZ debt should I pay off first?
Pay off the highest-interest debt first — usually credit cards and unsecured personal loans, which carry far higher rates than a mortgage or student loan. You save the most money and clear the most expensive debt sooner. That's the avalanche method.
What is the difference between snowball and avalanche?
Avalanche pays the highest-interest debt first to minimise total interest. Snowball pays the smallest balance first to build quick wins and momentum. Avalanche usually saves more money; snowball can be easier to stick to, which matters just as much.
Should I pay off high-interest credit card debt before my mortgage?
Usually yes. Credit card and unsecured personal loan rates in New Zealand are typically many times higher than a mortgage rate, so clearing them first removes your most expensive interest. Low-interest debt like a mortgage or interest-free student loan can keep its minimum while you attack the costly debt.
How do I start paying off my debt this week?
List every debt with its balance and rate, rank them, pick snowball or avalanche, and set a weekly dollar amount on top of minimums. Schedule it as an automatic recurring transfer, and direct any windfalls at the target debt.