Credit Utilisation

What New Zealand credit reporting actually holds

New Zealand runs comprehensive credit reporting through agencies including Centrix. A comprehensive report holds your credit limit by account, account status, up to 24 months of repayment history, defaults, insolvencies, judgments, credit enquiries and some personal details.

Centrix scores run from 1 to 1,000, with most people between 500 and 900, and Centrix describes a good score as above 705. When Centrix lists what affects your score, it names paying bills in full and on time, defaults, the number of credit enquiries, and having a thin credit history. It does not list the proportion of your limit you are using.

So the honest version is this: in New Zealand, whether you carry a balance matters mostly through whether you pay on time. Repayment history is recorded month by month, and that is the part doing the work.

Where your limit really bites

The bigger effect is not on your score at all. It is on serviceability, which is what a lender calculates when deciding how much to lend you.

New Zealand mortgage advisers consistently report that banks assess your full credit card and overdraft limits as a monthly commitment, commonly around 3% to 5% of the limit, regardless of your actual balance. The logic is that you could draw the whole limit tomorrow.

That means an unused $10,000 limit is treated as an ongoing obligation of roughly $300 to $500 a month in the servicing calculation, even at a zero balance. Advisers report the effect on borrowing capacity runs into tens of thousands of dollars. The exact treatment varies by lender, so this is a pattern rather than a rule.

A worked example

An example, not advice.

You have a card with a $10,000 limit and a $3,000 balance. Your utilisation is 30%, which by the familiar American guidance sounds fine.

You apply for a mortgage. The bank does not care that you only use $3,000 of it. It assesses the $10,000 limit at, say, 3% a month, so $300 a month is subtracted from what you can afford to repay before the loan is even considered.

Reducing the limit to $3,000, if that still suits you, changes the assessed commitment to about $90 a month. Nothing about your spending has changed. The number the bank works from has.

What people commonly get wrong

"Under 30% protects my credit score." That is US scoring guidance. In New Zealand, paying on time and avoiding defaults is what the reporting system records and what Centrix names as a score factor.

"Closing an unused card hurts my score." This is the piece of American advice that misleads people here most. A limit you are not using still reduces what a lender will advance you. If you are heading toward a mortgage application, an unused limit is usually a liability rather than an asset. Whether closing it is right for you depends on your circumstances.

"Utilisation is about how much I owe." It is about the relationship between what you owe and what you could owe. Two people owing $3,000 look very different if one has a $5,000 limit and the other a $30,000 limit.

"A high limit is a compliment from the bank." A limit increase is an offer of more debt. It is worth deciding whether you want it, rather than accepting it because it arrived.

Where it meets your weekly budget

Utilisation is a lender's view of you. Day to day, what matters is the payment, not the ratio: the minimum due, the interest accruing on the rest, and whether the payment is going to clash with rent week.

The practical version is to know what is genuinely spendable once card payments, bills and instalments have been accounted for, so the card is not quietly funding the gap between pay cycles. That is what Safe to Spend is built to show.

This is general information about how credit reporting and lender assessments work in New Zealand, not advice about your credit accounts or a mortgage application.