Your interest rate determines how much you pay each month and how much your property will cost you over time.
Lenders assess your application against specific criteria including your deposit size, credit history, employment type, and the property you're purchasing. The rate you're offered reflects the perceived risk of lending to you. A borrower with a 25% deposit and stable employment will typically receive a lower rate than someone borrowing at 90% with a variable income, even if they're applying for the same product from the same lender.
How Lenders Calculate Your Interest Rate
Your rate is built from a base rate set by the lender, adjusted up or down based on your individual circumstances. The loan to value ratio carries significant weight in this calculation. Borrowers who need Lenders Mortgage Insurance because their deposit is below 20% will generally face a higher rate, sometimes by 0.20% to 0.50% or more depending on the lender. Income stability also influences pricing. Self-employed applicants or those in casual roles may be quoted a slightly higher rate than permanent employees with the same deposit, reflecting the lender's assessment of repayment certainty.
Consider a borrower in Mandurah purchasing an investment property with a 15% deposit. They're quoted 6.45% variable. A similar applicant buying an owner-occupied property with a 25% deposit receives 6.09% from the same lender. The difference comes down to LVR and loan purpose, not the property itself.
Variable Rate vs Fixed Rate: Which Suits Your Situation
A variable rate moves with market conditions and lender decisions, while a fixed rate locks in your repayment for a set period, typically one to five years. Variable loans generally offer more flexibility, including the ability to make additional repayments without penalty, access to an offset account, and the option to refinance without break costs. Fixed loans provide repayment certainty but limit your ability to pay down the loan faster and may carry significant costs if you exit early.
If rates are rising or you need predictable budgeting, fixing part or all of your loan can provide stability. If you expect to receive lump sums or want the option to adjust repayments as your income changes, a variable rate or split structure will serve you better. Many borrowers in Mandurah who work in seasonal industries or have variable income prefer variable loans with offset accounts, allowing them to reduce interest during high-income periods without formally increasing repayments.
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Owner Occupied vs Investment: How Loan Purpose Affects Your Rate
Lenders price owner-occupied loans lower than investment loans, typically by 0.20% to 0.40%. This reflects the expectation that borrowers prioritise their own home over an investment property during financial difficulty. When you apply for a home loan, the lender will ask whether you intend to live in the property. This answer directly impacts your rate and the loan features available to you.
An applicant seeking an owner-occupied loan in Mandurah with a 20% deposit might be quoted 6.19% variable, while the same applicant purchasing an investment property at the same LVR could receive 6.49%. Over a 30-year term on a loan amount of $500,000, that difference equates to tens of thousands of dollars in additional interest.
Rate Discounts and How to Access Them
Most lenders advertise a standard variable rate, then apply discounts based on loan size, LVR, and whether you're a new or existing customer. A borrower with a loan amount above $500,000 and an LVR below 70% may receive a discount of 0.80% to 1.00% or more off the advertised rate. Borrowers with smaller loans or higher LVRs typically receive smaller reductions.
Discounts are not automatic. Lenders often reserve their most competitive pricing for new customers, meaning refinancing can unlock lower rates even if your circumstances haven't changed. We regularly see established borrowers in Mandurah paying 0.30% to 0.60% more than they need to, simply because they haven't reviewed their loan in several years. A comparison of current home loan rates from multiple lenders will show whether your existing rate still reflects your risk profile and the current market.
Offset Accounts and Interest Savings
A linked offset account functions like a transaction account but reduces the interest charged on your loan. If you have a loan amount of $400,000 and $30,000 sitting in your offset, you're only charged interest on $370,000. This can reduce your interest costs significantly over time without requiring you to lock funds into the loan itself.
Offset accounts are typically available on variable rate home loans, though some lenders restrict them on fixed rate products. Not all lenders offer a 100% offset. Some provide partial offsets where only a portion of the balance reduces your interest. When comparing home loan options, confirm whether the offset is full or partial and whether there are monthly fees attached.
Split Loans and Managing Rate Risk
A split loan divides your borrowing between fixed and variable portions, allowing you to lock in part of your repayment while maintaining flexibility on the remainder. A common structure is 50% fixed and 50% variable, though you can split at any ratio.
In a scenario where rates are volatile, a borrower might fix $300,000 at 5.99% for three years and leave $200,000 on a variable rate at 6.29% with an offset account. This approach provides budget certainty on the fixed portion while allowing additional repayments and offset benefits on the variable portion. If rates fall, the variable portion benefits immediately. If rates rise, the fixed portion shields you from half the increase.
Reviewing Your Rate After Pre-Approval
Home loan pre-approval gives you a rate indication based on your application at that time, but it's not locked in. Lenders reassess your circumstances and the property before final approval. If your employment changes, your credit file is affected, or the property valuation comes in lower than expected, your rate may be adjusted upward or the loan may be declined.
Pre-approval is typically valid for three to six months. If rates have moved during that period, your final rate will reflect current pricing, not the rate quoted at pre-approval. This is particularly relevant in Mandurah where settlement periods on new builds or house and land packages can extend beyond the pre-approval window. Confirm the rate again before signing your loan contract, and if it's increased significantly, ask your broker to compare rates with other lenders before proceeding.
What You Can Control and What You Can't
You cannot control the Reserve Bank's cash rate decisions or how individual lenders respond to funding cost changes. You can control your deposit size, your credit history, the loan structure you choose, and whether you review your loan regularly. Building equity over time improves your LVR, which opens the door to lower rates when you refinance.
If you're currently paying LMI on a loan taken out several years ago, your property may have increased in value enough that your LVR has dropped below 80%. Refinancing at that point removes the LMI component from your rate calculation and may qualify you for a better discount tier. A loan health check will identify whether your current rate still reflects your risk profile or whether refinancing would reduce your repayments.
Interest rates are not set and forget. Your circumstances, property values, and lender pricing all shift over time. Reviewing your loan every two to three years ensures you're not paying more than you need to. Call one of our team or book an appointment at a time that works for you.
Frequently Asked Questions
How does my deposit size affect my interest rate?
A larger deposit reduces your loan to value ratio, which lowers the lender's risk and typically results in a lower interest rate. Borrowers with a deposit of 20% or more avoid Lenders Mortgage Insurance and often receive rate discounts of 0.20% to 0.50% compared to those borrowing at 90% LVR.
Can I get a lower rate by refinancing my existing home loan?
Yes, refinancing can unlock lower rates, particularly if your LVR has improved due to property value growth or loan repayments. Lenders often reserve their most competitive pricing for new customers, so existing borrowers may be paying more than necessary without realising it.
What is the difference between a variable and fixed interest rate?
A variable rate changes with market conditions and offers flexibility such as offset accounts and unlimited additional repayments. A fixed rate locks in your repayment for a set period, providing certainty but limiting flexibility and often incurring break costs if you exit early.
How does a split loan work and when should I consider one?
A split loan divides your borrowing between fixed and variable portions, giving you repayment certainty on part of the loan while maintaining flexibility on the rest. This structure suits borrowers who want to manage rate risk without locking in their entire loan.
Do owner-occupied loans have lower rates than investment loans?
Yes, lenders typically price owner-occupied loans 0.20% to 0.40% lower than investment loans because borrowers are more likely to prioritise repayments on their own home during financial difficulty. This difference can result in significant savings over the life of the loan.
