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How Credit Cards Work in NZ: Interest, Fees and Protections

Updated

A credit card is a revolving line of credit up to a set limit. Used one way it costs nothing; used another it is one of the most expensive kinds of consumer debt in New Zealand. This page explains how the statement, the interest-free period, interest charges, cash advances and card protections work.

Quick answer

Paying the full closing balance by the due date each month means no interest on purchases. If the balance isn't paid in full, interest is charged and the interest-free days are lost until the balance is cleared. At an example rate of 20.95% p.a., a $3,000 balance repaid at a minimum of 3% a month takes about 18 years to clear and costs about $3,700 in interest; at a 2% minimum it takes more than 60 years.

The Monthly Statement

Each month the card issuer sends a statement showing:

  • Closing balance: what you owe on the statement date
  • Minimum repayment: the smallest amount you can pay without being in arrears, usually a percentage of the balance or a fixed dollar amount, whichever is greater
  • Payment due date: the date the payment must reach the card account

Missing the minimum repayment usually triggers a late payment fee and can be recorded on your credit report (see how NZ credit reporting works).

The Interest-Free Period

NZ credit cards offer interest-free days on purchases, typically up to 44 to 55 days counted from the start of the statement period. The interest-free days only apply when the full closing balance is paid by the due date. ANZ’s wording is typical: “You must repay your balance in full by the due date each month to get the benefit of interest-free days on purchases” (checked 14 October 2026).

How it works:

  • You make purchases through the month
  • At the end of the statement period, a statement shows the closing balance
  • The due date is usually 20 to 25 days after the statement date
  • Pay the full closing balance by the due date and no purchase interest is charged

What Happens If You Don’t Pay in Full

If the full balance isn’t paid by the due date, interest is charged on purchases, usually from the date of each transaction rather than from the due date, and new purchases lose their interest-free days until you return to paying in full. Each issuer’s terms set out exactly which balance interest is charged on.

Example

You have a $2,000 balance and pay $1,900, leaving $100 unpaid.

What you might expect: interest on $100 only.

What can happen: interest calculated on the purchases from the date each was made, plus interest on new purchases from the day they are made, until the balance is cleared in full.

This is why a small shortfall can cost more than expected.

How Interest Is Calculated

NZ credit cards calculate interest daily and charge it monthly. The daily rate is the annual rate divided by 365.

For a card at an example rate of 20.95% p.a.: Daily rate = 20.95% ÷ 365 = 0.0574% per day

On a $3,000 balance:

  • Daily interest: $3,000 × 0.000574 = $1.72 a day
  • Monthly interest: about $52.38 a month
  • Over a year, if the balance stays at $3,000: about $628.50

The Minimum Repayment

The minimum repayment is set low, so most of it goes on interest while a balance is large.

Worked Example: $3,000 Balance at 20.95% p.a.

Assumptions: $3,000 balance, 20.95% p.a., interest charged monthly, no new purchases, minimum repayment of 2% or 3% of the balance with a $10 floor. Figures are rounded.

Repayment After 1 year Time to clear Total interest
Minimum of 2% (about $60 in month 1, $52 of it interest) Owe about $2,898 About 61 years About $15,800
Minimum of 3% (about $90 in month 1) Owe about $2,562 About 18 years About $3,700
Fixed $100 a month Owe about $2,370 About 3.6 years About $1,290
Fixed $200 a month Owe about $1,048 About 18 months About $510
Fixed $400 a month Cleared About 9 months About $240

A falling percentage minimum shrinks as the balance shrinks, which is why it takes so long. A fixed repayment clears the balance on a set timetable.

Interest Rates

Most NZ credit cards charge around 20.95% p.a. on purchases, and a few low-rate cards charge about 13% to 14%. For the current rates and fees of the low-rate cards, see low interest credit cards in NZ.

Cash Advances

Cash advances (withdrawing cash with a credit card, or some cash-like transactions) work differently:

  • No interest-free period: interest starts the day the cash is taken
  • Often a higher rate: for example, the ANZ Low Rate Visa charges 13.90% p.a. on purchases and 20.95% p.a. on cash advances, and the BNZ Lite Visa 13.50% p.a. on purchases and 22.95% p.a. on cash advances (both checked 14 October 2026)
  • Fees: some issuers also charge a fee per cash advance; the issuer’s fee schedule lists it

Balance Transfers

Some issuers offer a promotional rate on a balance moved from another card for a fixed period, after which the rate reverts. Revert rates, transfer fees and how new purchases are treated vary by offer; see balance transfer credit cards.

Chargebacks and Purchase Protection

Card schemes such as Visa and Mastercard have a dispute process, called a chargeback: if a merchant doesn’t deliver what you paid for, or a transaction is fraudulent, you can ask the card issuer to dispute it and reverse the charge. This can help with:

  • Online purchases from unfamiliar retailers
  • Large purchases where there’s delivery or quality risk
  • Travel bookings, if an airline or accommodation provider fails

Issuers set their own time limits and conditions. For example, BNZ’s NetPromise says: “if you buy something online and don’t receive it, or you return it and don’t get a refund, we can help you get your money back if you let us know within 30 days” (checked 14 October 2026). A dispute is raised with the card issuer, not the merchant.

Buy Now Pay Later

Buy now pay later services split a purchase into instalments with no interest if every payment is made on time, but charge late fees when one is missed. How they compare with a credit card, and how they appear on your credit report, is covered in buy now pay later in NZ.

Credit Cards and Your Credit Report

Each credit card application is recorded as an enquiry on your credit report, and lenders can see the card limit and, under comprehensive credit reporting, whether repayments were made on time. Missed payments and defaults stay on the report for set periods; see how NZ credit reporting works and defaults on your credit report.

Ways to Avoid Paying Interest

  1. Pay the full closing balance by the due date, not the minimum or most of it
  2. Set up an automatic payment for the full balance on the due date, which most NZ banks allow
  3. Keep cash advances off the card, since they have no interest-free days
  4. If a balance can’t be cleared this month, a larger fixed repayment shortens the time to clear it, as the table above shows