Interest rates guide

Knowing what an interest rate is and how it works is one of the most important pieces of knowledge a potential borrower needs.

Interest is the price a borrower pays to borrow money from a lender. It can also be the amount that is earned on deposited funds in an account such as a savings account. Lenders who charge interest are essentially placing a leasing charge on an asset’s use. When talking about loans, the asset is money, so it’s important to understand the ins and outs of interest rates.

Interest rate basics: What does p.a. mean?

P.a. literally means per annum, or every year. When interest is expressed as a percentage followed by the term p.a., it means that the rate you are looking at is the yearly rate. The p.a. rate can either be calculated at the end of the year, or compounded as often as each month. More on the difference between simple interest and compound interest is covered in the savings account section below.

Credit card interest

Credit cards can have varying interest rates. You will be able to find cards with around 13% interest on the lower end of the spectrum and cards with upwards of 20% interest on the higher end of the spectrum. These rates are calculated daily and applied monthly to any charges you make. This does not mean that you will always be paying interest on all of your purchases though, as there a few ways to avoid it.

One way is through the introductory rates which are often offered on credit cards. With an introductory rate you are receiving a very low interest rate for a set period of time after the activation of the card.

Paying off the full closing balance of your statement each month by the payment due date is another way to avoid interest charges. If there’s no balance, you can’t be charged interest.

Interest free days are a very handy feature usually offered with credit cards which allows you to pay off your purchases before the due date. Many cards will offer an interest free period on purchases. For example, if you charge $200 on your credit card at the start of your statement cycle and the card has 55 interest free days, you will have 55 days to pay off the balance. When comparing credit cards make sure to see how many interest free days are offered on purchases, as you can save a lot of money in the long term by taking advantage of them.

Compare credit cards

Rates last updated August 20th, 2018
Name Product Purchase rate (p.a.) Balance transfer rate (p.a.) Annual fee Product Description
St.George Vertigo Platinum - Online Offer
12.74% p.a.
0% p.a. for 25 months
$99 p.a.
Long-Term Balance Transfer Offer
Get platinum perks and save with 0% p.a. interest for up to 25 months on balance transfers with no BT fee.
Citi Clear Platinum - Exclusive Offer
14.99% p.a.
0% p.a. for 24 months with 1.5% balance transfer fee
$49 p.a. annual fee for the first year ($99 p.a. thereafter)
Reduced First Year Annual Fee & Balance Transfer Offer
finder Exclusive: Receive 0% p.a. for 24 months on balance transfers and a discounted annual fee in the first year. Plus, access to Citi World Privileges.
Westpac Low Rate Card
13.49% p.a.
0% p.a. for 24 months with 1% balance transfer fee
$0 p.a. annual fee for the first year ($59 p.a. thereafter)
$0 First Year Annual Fee and Balance Transfer Offer
Offers a 0% for 24 month balance transfer option, first year annual fee waiver and a competitive purchase rate.
Suncorp Clear Options Platinum Credit Card - Exclusive Offer
20.74% p.a.
0% p.a. for 18 months
$99 p.a. annual fee for the first year ($129 p.a. thereafter)
Exclusive Offer to finder.com.au
finder Exclusive: Receive a long 18-month, 0% p.a., no fee balance transfer and earn Suncorp Rewards Points or Qantas Points per $1 spent.
St.George Vertigo Visa
13.74% p.a.
0% p.a. for 16 months
$55 p.a.

Low Annual Fee with Balance Transfer Offer

Get 0% p.a. interest for up to 16 months on balance transfers with no BT fee. Plus, a competitive annual fee.

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Loan interest rates

The interest rate that must be paid on a home or personal loan has a lot to do with the cash interest rate set by the Reserve Bank of Australia. This rate is renewed every month and lenders base their rates off of this.

You can choose to pay a variable interest rate on your home or personal loan. This type of interest rate is very closely tied to the cash rate and can be a bit unstable. The benefit of a variable rate is that they usually go down if the Reserve Bank of Australia decides to lower the official cash rate. Also, restrictions on the number of repayments you can make in a certain amount of time are usually looser with variable rates of interest. Be wary though, if the cash rate goes up, your variable interest rate will too.

Fixed rates when applied to personal loans or home loans are a good safeguard against future rises in interest rates across the board. You can lock in your interest rate for a period of 1 to 5 years in general. You won’t benefit from falling interest rates, but you also won’t have to worry about skyrocketing interest rates also. There are usually ways to refinance your loan to a lower fixed interest rate, but you may have to pay a fee.

Split interest rates let you pay a fixed rate on a portion of your home or personal loan and a variable rate on the rest. This type of interest structure is good for borrowers who want the security of regular and unchanging payments on part of their loan, with the flexibility offered by variable interest rates on the other part of their loan. The fixed portion of the loan is usually more restrictive in terms of repayment options, but as mentioned it won’t fluctuate like the variable portion.

Comparison rate

Lenders by law must provide comparison rates in order to make the loan comparison process much easier for customers. It’s normally fairly difficult to compare two loans that have differing fees and interest rates, so a comparison rate attempts to provide a top down overview of the average rate when fees and charges are taken into account.

For example, if a loan has an 8% interest rate, but fees and charges total 1% of the total cost of the loan, the comparison rate will be 9%. Whereas a loan that has a 8.25% interest rate and .5% total fees and charges will have its comparison rate calculated as 8.75%. Therefore, a loan with a lower interest rate will not always be better than one with a higher interest rate. It’s important to use the comparison rate to get a better picture of how much you will actually have to be repaying on the loan.

Keep in mind that a comparison rate for home loans is always calculated with the same loan terms: $150,000 borrowed over 25 years. This means that the rate might not always be as accurate if your loan amount of term deviates from this, so keep this in mind when using comparison rates.

Compare home loans

Rates last updated August 20th, 2018
$
Loan purpose
Offset account
Loan type
Your filter criteria do not match any product
Interest Rate (p.a.) Comp Rate^ (p.a.) Application Fee Ongoing Fees Max LVR Monthly Payment
loans.com.au Essentials - Variable (Owner Occupier, P&I)
Competitive interest rate and limited fees
A simple mortgage with a competitive interest rate and no application or monthly fees. Borrow up to $2 million from a convenient online lender.
3.64% 3.66% $0 $0 p.a. 80% Go to site More info
UBank UHomeLoan Variable Rate - Discount offer for Owner Occupiers, P&I Borrowing over $200,000
Special discounted interest rate
Enjoy flexible repayments, a redraw facility and the ability to split your loan. Plus, pay no application or ongoing fees.
3.59% 3.59% $0 $0 p.a. 80% Go to site More info
Tic:Toc Live in Loan Variable Rate - Principal & Interest
Get approved faster with a speedy online application
Low interest rate and limited fees. Add a 100% offset account for $10 a month.
3.64% 3.65% $0 $0 p.a. 80% Go to site More info
Virgin Reward Me Variable Home Loan - LVR <= 80% ($500k to $750k Owner Occupier, P&I)
Earn Velocity Frequent Flyer Points with this mortgage to spend on flights and more (subject to eligibility requirements). Redraw facility available on this variable rate home loan. Competitive interest rate.
3.68% 3.82% $0 $10 monthly ($120 p.a.) 80% Enquire now More info
ME Flexible Home Loan With Member Package - LVR <=80% $400k up to $699,999 (Owner Occupier, P&I)
Save on interest with a 100% offset account
Unlock a range of savings with this competitive package home loan offer. Offset account and redraw facility included.
3.69% 4.11% $0 $395 p.a. 80% Go to site More info
ClickLoans The Online Home Loan - LVR <70% with Offset
Requires a 30% deposit
Enjoy all the benefits of the Basic Home Loan and take advantage of an offset account.
3.70% 3.90% $0 $0 p.a. 70% Go to site More info

Savings account interest rates

With savings accounts you earn interest on the money you have deposited. An interest rate can be calculated and paid out on a yearly basis, or compounded as often as every month. When depositing money, you will want to try and get a compounding interest rate. Here is an example of the difference between the two types of interest calculation and how they impact your bottom line:

The difference between simple and compound interest

Simple interest

Simple interest is paid only on the money you have deposited into your account and not the earnings of said account. If your savings are earning a simple, or nominal, interest rate, there is no reason to have it compounded. If you deposit $10,000 into a savings account with a 6% p.a., you will earn $600 per annum on interest.

Compound interest

Compound interest means that the interest earned on your savings is added to your balance on a regular basis. Not only does your money earn interest, but your interest earns interest as well. If you have an interest rate of 6% on 10,000 dollars in deposits and it’s compounded monthly, you will earn approximately $617 in interest over the course of a year. This is because each month, the interest is calculated on the balance plus the interest earned the month before.

Bonus rates for savings accounts

Bonus interest rates for savings accounts are higher than normal rates. Banks and other financial institutions offer bonus interest rates for a variety of reasons. You may find that a bank offers bonus rates to customers with multiple banking accounts, students or for people who use certain financial products or features that the bank offers. Always look into the potential bonus rates you can earn with each bank, as you can end up earning a lot more money in the long run with a higher rate on your savings.

Compare savings accounts

Rates last updated August 20th, 2018
$
$
months
Name Product Maximum Variable Rate p.a. Standard Variable Rate p.a. Bonus Interest p.a. Fees Min Bal / Min Deposit Interest Earned Product Description
RaboDirect High Interest Savings Account
3.05%
1.80%
1.25%
$0
$0 / $1
Introductory rate of 3.05% p.a. for 4 months, reverting to a rate of 1.80% p.a. Available on balances below $250,000
ING Savings Maximiser
2.80%
1.00%
1.80%
$0
$0 / $0
Ongoing, variable 2.80% p.a. when you link to an ING Orange Everyday bank account and deposit $1,000+ each month and make 5+ card purchases a month. Available on balances up to $100,000.
Bankwest Hero Saver
2.60%
0.01%
2.59%
$0
$0 / $0
Ongoing, variable 2.60% p.a. rate when you deposit at least $200 each month and make no withdrawals. Available on balances up to $250,000.
AMP Saver Account
2.55%
2.10%
0.45%
$0
$0 / $0
Introductory rate of 2.55% p.a. for 4 months, reverting to a rate of 2.10% p.a. Available on balances below $5,000,000.
AMP SuperEdge Saver Account
2.05%
2.05%
0.00%
$0
$0 / $0
Link to your SMSF. Ongoing, variable 2.05% p.a. when you link to AMP SuperEdge Cash Account or a different transaction account for your SMSF in another bank. Available on the entire balance.

Compare up to 4 providers

Knowing how interest works will increase your ability to compare financial products. Get familiar with it and how it’s applied to your account, whether you’re being charged interest or earning it.

Marc Terrano

Marc Terrano is a content marketer manager at finder. He's been writing and publishing personal finance content for over five years and loves to help Australians get a better deal.

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