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Interest rates guide

What you need to know about interest rates to make sure you're getting the best deal.

A number of different financial products come with interest rates: personal loans, home loans, credit cards, term deposits and savings accounts. Interest rates either cost you money or earn you money. For example, your savings account interest rate will earn you money whereas your credit card interest rate will cost you money.

Interest rates can be structured and charged in different ways depending on the bank and the product. This guide will explain how interest rates work so you can compare products and find the right one for you.

What does interest p.a. mean?

You see “p.a.” after the percentage symbol in an interest rate. It stands for “per annum” and means the rate is an annual rate. With financial products, annual interest is calculated regularly (usually daily) as you make regular repayments to a loan or put more money into your savings account.

What are the different types of interest rates?

There are two main types of interest rates, fixed and variable:

  • Fixed interest rates. This is a set interest rate that is essentially “locked” for the duration of your loan term. The rate you agree to in your loan contract is guaranteed to remain in place until you close the loan out at the end of the term.
  • Variable interest rates. This is a rate that may change during your loan term and is known as a floating rate in the mortgage world.

Personal loans can come with a variable interest rate but it is unlikely for the rate to change during the loan term. It’s more common to find fixed rates. Where you will commonly see variable rates is with home loans – you can opt for a floating rate and let the market dictate how much interest you pay. This can be beneficial if the rates go down, but if the rates go up, you will end up paying more in interest.

How is interest charged on different financial products?

Interest works very differently depending on the type of product you have:

Credit cards

Credit cards come with variable, annual interest rates. The rates vary a lot depending on what features the card offers, but you can generally find a basic, no-frills credit card for between 9.95–13% p.a. while a rewards or feature-packed card can set you back between 19.95–22.95% p.a.

You will find two types of interest rates on a credit card: purchase rate and cash advance rate. The purchase rate is what you’re charged to make purchases on the card and the cash advance rate is what you’re charged to withdraw cash. Credit cards can also offer special interest rates such as 0% or low balance transfer rates.

Another interest rate-related feature of credit cards is interest-free days. This refers to the period of time between making a purchase and when you will be charged interest on that purchase. If you pay off your credit card balance during this period, you will not be charged interest. Most credit cards offer 44 or 55 interest-free days.

Personal loans

While the interest rates on personal loans may be stated as variable, they are most commonly fixed for the life of your loan. This means that even though the bank’s rate fluctuates, a rate is locked in for you when you sign your contract and it won’t change during the loan term.

Personal loan interest rates used to very much reflect the market, specifically the cash rate. However, lenders, especially non-bank lenders, have been moving towards personalising interest rates based on how risky it is to offer you the loan.

This is why there are now two types of interest rates you will see advertised for personal loans: set rates and risk-based rates. Set rates are given to everyone who is approved for a personal loan for that lender.

Lenders offerings risk-based interest rates provide a range, for example, 9.25%–20.95% p.a., and you can be approved for an interest rate between that range. Usually, you can get an estimate of the rate you will receive before you fully apply for a loan and without it affecting your credit score. If you have a good credit score, assets and minimal debt, you may get a rate that is on the lower end of the scale. If you have a bad credit history and are deemed more of a risk to the lender, your rate may be higher.

Home loans

Home loan interest rates can be fixed or variable, also known as floating. Fixed interest rates are guaranteed not to change whereas variable rates may fluctuate.

With home loans, fixed interest rates apply for a set amount of time. You can choose to lock a rate in for a period of between six months and five years. Rates vary over different terms, so you don’t necessarily get a better rate for a longer term. Floating home loan interest rates can change quite frequently as they are heavily influenced by factors in the market, especially the Official Cash Rate (OCR).

The interest you are charged will generally be calculated daily. Home loans can also either be principal and interest, meaning you’re repaying both the interest you’re being charged and the original amount you borrowed, or interest-only, so you are only repaying the interest accruing on your debt.

How should you compare interest rates?

Keep the following in mind when comparing interest rates:

  • The actual rate. Look at how competitive the interest rate is when comparing. While the cheapest isn’t necessarily the best, a better interest rate can save you money in the long run. Remember that rates for personal loans are often given as a range, so you won’t know your exact rate until you apply or get a quote.
  • Like-for-like. While comparing interest rates across products is a good idea, make sure the products you are comparing are similar. For example, you might compare one credit card to another one with a much lower interest rate but it doesn’t mean it comes with the same features. See what features and benefits the products offer and ensure you are comparing similarly-featured products.

What about earning interest?

While you are charged interest for any lines of credit such as a mortgage, credit card or personal loan, you can earn interest on savings accounts and term deposits.

All savings accounts come with a variable base rate, with most calculated daily on your principal balance and paid into your account monthly. This is referred to as compound interest: the interest repayments you earn then go on to earn interest themselves.

Some savings accounts can also offer you bonus interest on top of the standard base variable rate which may be for an introductory period, such as for the first three months after opening the account, or applied monthly if you meet certain conditions, such as regularly depositing money into the account.

Compare interest rates across personal loans

1 - 7 of 7
Name Product Interest Rate (p.a.) Loan Amount Loan Term Monthly Service Fee Establishment Fee Offer
AA Money Secured Personal Loan
AA Money Secured Personal Loan
9.95% - 17.95%
$3,000 - $50,000
12 to 36 months
$0
$290
Requirements: NZ citizen/permanent resident, have a stable income.
Harmoney Unsecured Personal Loan
7.99% - 22.99%
$2,000 - $70,000
3, 5 or 7 years
$0
$150
Requirements: NZ citizen/permanent resident, have a good credit score.
FROM 6.99%
The Co-operative Bank Unsecured Personal Loan
6.99% - 17.75%
$3,000 - $50,000
6 months - 5 years
$0
$155
Requirements: NZ citizen/permanent resident or have a valid work visa.
Lending Crowd Personal Loan
6.45% - 19.30%
$2,000 - $200,000
2, 3 or 5 years
$0
$350 - $650 depending on the amount borrowed
Requirements: NZ citizen/permanent resident, have a good credit score.
Nectar Unsecured Personal Loan
8.95% - 29.95%
$1,000 - $30,000
6 months to 4 years
$0
$240
Requirements: NZ citizen/permanent resident, have an income of $400/week, stable credit history.
Save My Bacon Unsecured Flex Loan
49.95%
$2,000 - $5,000
12 to 36 months
$4
$125
Requirements: NZ citizen/permanent resident or have a valid work visa, have an income of at least $400/week.
MTF Finance Secured Personal Loan
11.35% - 23.35%
$2,000 - $100,000
3 - 48 months
$8.50
$376
Requirements: NZ citizen/permanent resident or have a work visa, have a regular source of income.
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