The short answer: an interest rate is the percentage a lender charges you to borrow money, applied to what you owe over the life of the loan. In Australia, your rate is shaped by the Reserve Bank of Australia's cash rate, your financial profile and the type of loan you take.
Noma Finance compares rates across a panel of around 25 lenders, so you see the total cost of the finance before you sign, not just the monthly repayment.
An interest rate is a fee for using someone else's money. When you take out a car, home or personal loan, the lender charges a percentage on top of what you borrowed. That percentage is the interest rate.
Interest is worked out in one of two ways.
Here is the difference on a $10,000 loan at 6% a year over three years.
Figures are illustrative only, based on a $10,000 loan at 6% a year over three years. They exclude fees and do not represent a specific product.
The gap looks small here. Scale it to a $500,000 home loan over 30 years, and compounding adds up fast. That is why paying a little extra early, even small amounts, can save you thousands.
In Australia, the Reserve Bank of Australia (RBA) sets the cash rate. This is the rate banks charge each other for overnight loans, and it acts as the baseline for most other rates in the country.
When the RBA lifts the cash rate, lenders usually lift their rates. When it falls, lending rates tend to follow, though not always straight away or by the same amount. The RBA's Monetary Policy Board meets eight times a year and weighs up inflation, employment and the wider economy.
Here is the part most people miss: the RBA sets the cash rate, but your lender sets your actual rate. Two lenders can see the same cash rate and still offer you very different rates, based on their own funding costs, risk appetite and strategy.
This is why comparing across lenders matters. One lender only ever shows you its own rates. A broker compares a panel, so you can see where the genuinely competitive offers sit. Our guide on choosing a finance broker versus a bank explains that difference in full.
Rates also vary by loan type. A secured car loan, where the car is security, is usually lower than an unsecured personal loan. A home loan, backed by property, typically carries the lowest rate of all. The more security a lender holds, the less risk it carries, and it prices that in. If a car is your next purchase, our rundown of car loan interest rates goes deeper on that market.
Neither is automatically lower. They do different jobs, and the right choice depends on your situation, not a blanket rule.
A fixed rate locks your rate for a set period, usually one to five years. Repayments stay the same whatever the RBA or your lender does. When the term ends, the loan usually reverts to a variable rate unless you renegotiate.
A variable rate moves with the market. Repayments can fall when rates drop and rise when they climb. Variable loans usually offer more flexibility, such as offset accounts, redraw, and extra repayments without penalty.
Some borrowers split a loan between fixed and variable for a bit of both. There is no single right answer, only trade-offs. What matters is understanding them before you commit.
A comparison rate is a single percentage that folds most standard fees into the interest rate, giving you a more realistic cost.
Under Part 10 of the National Credit Code, if a lender advertises an interest rate (or a repayment amount) for fixed-term consumer credit, it must also show a comparison rate, displayed just as prominently. The comparison rate is worked out on a standard example so products can be compared on equal terms, commonly a $150,000 loan over 25 years for home loans, and a comparable set example for car and personal loans (often around $30,000 over five years). By law the comparison rate carries a warning that it is true only for that example, and that a different amount or term will give a different figure.
Here is why it matters. A lender might advertise 5.50% a year, but once application, monthly and annual fees are included, the comparison rate could be 5.85%. That 0.35% gap is real money over the life of a loan.
The comparison rate is not perfect. It leaves out some costs, such as early exit or redraw charges, and it uses a standard loan size that may not match yours. But it is far more honest than the headline rate, and it should be your starting point.
The takeaway: never compare on headline rate alone. If a deal looks too good on the surface, the comparison rate usually shows why.
The advertised rate is rarely the rate you walk away with. Lenders assess your individual risk, and a few things shape their offer.
Knowing these puts you in a stronger position. A broker can also flag which lenders suit your profile, because each one weighs these factors differently. If a personal loan is on your mind, see our take on what counts as a good personal loan interest rate.
Even a small shift matters more than people expect. Here is a $30,000 loan at three rates over five years, with monthly principal and interest repayments.
Figures are illustrative only, on a $30,000 principal and interest loan over 60 months. They exclude fees and do not represent a specific product. Actual repayments depend on your terms and lender.
The gap between 5% and 9% here is about $57 a month. Over five years, that is roughly $3,400 in extra interest. On a $600,000 home loan over 30 years, the same four-point difference runs into hundreds of thousands.
This is why the total cost matters more than the monthly figure. A longer term makes the monthly repayment look smaller while you pay far more interest overall. Always ask for the total amount repayable, not just the monthly number.
Comparing rates is not about picking the lowest number. A few steps get you to the real cost.
The cash rate is the rate banks charge each other for overnight loans, set by the RBA's Monetary Policy Board, which meets eight times a year. When it moves, lenders usually adjust their variable rates in the same direction, so your variable repayments may rise or fall. Fixed rate loans are not affected during the fixed term.
Not always. A lower headline rate can carry higher fees, stricter terms or fewer features. The comparison rate gives a fuller picture because it includes most standard fees. Compare on total cost, including rate, fees and the full term, not the headline rate alone.
The RBA reviews the cash rate eight times a year. Lenders can change variable rates at any time, though they usually move in response to the RBA. Fixed rates are locked for the agreed term. Variable rates on existing loans can change with little notice.
A broker compares options across multiple lenders, so you see a wider range than a single bank offers. Brokers can also flag which lenders suit your situation, whether you are self-employed, buying a car or refinancing. At Noma Finance, the comparison is done for you, so you see the total cost before you commit.
Yes, significantly. Home loans generally carry the lowest rates because the property is security. Secured car loans sit in the middle, and unsecured personal loans are usually highest, as no asset backs the loan. Your rate also depends on your financial profile, the amount and the term.
On a variable loan, your rate can change when the RBA moves the cash rate or when your lender adjusts its rates independently. That has nothing to do with your payment history. On a fixed rate, your rate holds during the term, then may change when it reverts to variable. If it has risen and you are unsure why, it is worth checking whether a more competitive option exists.
If you would rather see the total cost across the panel before you commit, send us your details, and we will compare around 25 lenders for you. Start here, no pressure and no obligation.
Ashley Van Rosmalen is the founder of Noma Finance, an Australian finance and asset brokerage. Ashley has personally held every loan type Noma helps with, from car and personal loans through to home and business finance, so the guidance comes from experience rather than a script. Read more about Ashley and the team at https://www.nomafinance.com.au/about-us.
General information disclaimer. This article is general information only and does not take into account your objectives, financial situation or needs. It is not financial or credit advice. Any rates, repayments and figures shown are illustrative only, correct as at the date shown, and will vary with your situation and the lender. Consider whether the information is right for you, and seek advice from a licensed professional before making a decision.
Credit Representative 544208 is authorised under Australian Credit Licence 389328. Van Rosmalen Group Pty Ltd, trading as Noma Finance.
Last updated: 10 September 2026
Sources last checked: 10 September 2026
Written by Ashley, founder of Noma Finance. Before becoming a finance and asset broker, Ashley worked at car dealerships, and has personally held every loan type Noma helps with. Noma compares options across a panel of lenders to help people find finance that fits their situation, explained in plain English.
This article is general information only. It does not take into account your objectives, financial situation or needs, and it is not financial, credit or tax advice. Consider whether it is appropriate for you and seek advice from a licensed professional before making a decision. Tax outcomes for novated leases and chattel mortgages depend on your circumstances, so speak with a licensed tax adviser or accountant. Any figures used are illustrative only.
