How Interest Rates Impact Your Borrowing Capacity

When interest rates move, your borrowing capacity moves with them. A shift of just half a percent can change the amount a lender will approve by tens of thousands of dollars, even when your income and expenses stay exactly the same.

For Service NSW employees with stable income and employment, the challenge is not proving you can service a loan. The challenge is knowing how much you can borrow at current rates, and how that figure might change if rates move between pre-approval and settlement.

Why Lenders Use a Rate Buffer in Their Assessment

Lenders do not assess your borrowing capacity at the actual rate you will pay. They assess it at a rate 3% above the product rate, a requirement under APRA's lending standards. If you apply for a variable rate currently sitting at 6.2%, the lender tests whether you can service repayments at 9.2%.

This buffer protects both you and the lender from rate rises. It also means that when product rates increase, your borrowing capacity falls even though you have not applied for the higher rate yet. The assessment rate climbs in step with the product rate.

Consider a Service NSW employee earning $85,000 annually with $600 in monthly commitments. At a product rate of 6.2%, the serviceability test applies a rate of 9.2%. If that product rate rises to 6.7%, the test rate becomes 9.7%, and the maximum loan amount drops by roughly 6% to 7%. That can mean a reduction of $40,000 to $50,000 in borrowing capacity on a loan sized around $600,000 to $700,000.

How Income Stability Affects Your Assessment

Service NSW employees benefit from consistent income that lenders can verify through payslips and employment contracts. Most lenders will include base salary, regular allowances, and permanent overtime or shift loadings that appear on your payslips for at least three months.

If you receive allowances such as meal allowances or uniform allowances, check whether they are classified as taxable or non-taxable. Lenders typically include taxable allowances but may exclude or reduce non-taxable amounts. Casual loading, where applicable, is generally included if you can demonstrate 12 months of consistent hours in the same role.

The more income a lender can verify and include, the higher your borrowing capacity at any given interest rate. For Service NSW employees with additional income from investment properties, rental income is usually included at 80% of the gross amount after deducting any interest expenses on the investment loan. If the property is negatively geared, the shortfall reduces your borrowing capacity because it is treated as an ongoing commitment.

Fixed Rate vs Variable Rate and Borrowing Capacity

The type of rate you choose does not change your borrowing capacity at the time of assessment. Whether you apply for a fixed rate, variable rate, or split loan, lenders apply the same serviceability buffer to each portion.

What does change is the rate you actually pay after settlement. If you fix at 5.9% and variable rates rise to 6.5%, your repayments stay lower during the fixed period, but your borrowing capacity would have been assessed using the buffer applied to whichever rate was higher at the time of application.

Some borrowers assume that locking in a fixed rate protects their borrowing capacity. It does not. It protects your repayments. Your borrowing capacity is set at the point of approval based on the assessment rate at that time. Once the loan settles, the amount is locked in regardless of future rate movements, but if you need to increase the loan or refinance during the fixed term, you will be reassessed at the rates and policies in place at that time.

When Rate Rises Between Pre-Approval and Settlement

Pre-approval gives you a borrowing limit based on the lender's assessment at the time of approval. That approval is usually valid for three to six months, depending on the lender. If the product rate rises during that window, most lenders will reassess your borrowing capacity before formal approval, particularly if you are applying for an amount close to your pre-approved limit.

In our experience, borrowers who secure pre-approval early and move decisively have more certainty. If rates rise after your pre-approval but before you make an offer, speak to your broker before committing to a purchase price. Some lenders will honour the original assessment if the application progresses quickly and no other circumstances have changed, but this is not universal.

If your borrowing capacity drops and you have already exchanged contracts, you may need to increase your deposit, find a guarantor, or negotiate with the vendor. None of those options are ideal, which is why timing matters.

How Your Deposit Size Influences What You Can Borrow

Your deposit does not directly change your borrowing capacity, but it changes the loan amount you need. If you can borrow $650,000 and you have a $100,000 deposit, you can purchase a property worth $750,000. If your deposit is $50,000, the same borrowing capacity gives you a purchase price of $700,000.

For Service NSW employees with access to LMI waivers, a smaller deposit does not always mean higher costs. Some lenders offer LVR discounts that reduce the interest rate as your deposit increases, but those discounts are typically 0.1% to 0.2%, which has a modest impact on serviceability compared to broader rate movements.

If you are using the 5% Deposit Scheme, the guarantee from Housing Australia allows you to borrow up to 95% of the property value without paying LMI. Your borrowing capacity is still assessed in the same way, but you are not required to save a 20% deposit to avoid LMI. The scheme has property price caps that vary by location, so confirm the applicable cap before assuming the scheme will cover your intended purchase.

Borrowing Capacity and Ongoing Commitments

Lenders subtract your ongoing commitments from your income before calculating how much you can borrow. Commitments include credit card limits, personal loans, car loans, HECS-HELP debts, and other mortgages.

Credit cards are assessed at their full limit, not the balance. If you have a $10,000 limit and owe $2,000, the lender assumes you could draw the full $10,000 and includes a monthly repayment based on that limit. Reducing your limit or closing unused cards before you apply can lift your borrowing capacity by several thousand dollars per card.

HECS-HELP debts are included once your income exceeds the compulsory repayment threshold. The lender calculates the repayment as a percentage of your gross income and deducts it from your serviceability. For a Service NSW employee earning $85,000 with a HECS debt, the annual repayment sits around $2,500 to $3,000 depending on the balance, which reduces monthly serviceability by roughly $200 to $250.

What Happens When Rates Fall

When product rates fall, the assessment rate falls with them, and your borrowing capacity increases. The reverse of the earlier example applies. A drop of 0.5% in the product rate can increase borrowing capacity by 6% to 7%, assuming your income and commitments remain unchanged.

If you are planning to purchase in the next 6 to 12 months and expect rates to fall, you might wait for a better borrowing position. The risk is that property prices may rise faster than your borrowing capacity improves, particularly in markets where demand is strong. Waiting for a rate cut that does not arrive, or that delivers less benefit than expected, can leave you further behind.

For borrowers already holding a home loan, falling rates may create an opportunity to access equity for renovations, investment, or other purposes. Your borrowing capacity is reassessed at the time of any top-up or refinance, so a lower rate environment increases the amount you can access without increasing income.

Using Offset Accounts to Build Serviceability Options

An offset account does not change your borrowing capacity at the point of assessment, but it does reduce the interest you pay after settlement. The less interest you pay, the more quickly you reduce your loan balance, which can improve your position if you refinance or apply for additional borrowing later.

Some Service NSW employees use an offset to park savings they may need in the short term, such as funds set aside for a vehicle purchase, holiday, or emergency buffer. The balance in the offset reduces interest daily without locking the funds into the loan, so you retain access while still benefiting from lower interest costs.

If you are comparing loan products, check whether the offset is fully linked and whether the lender charges a monthly fee. A loan with a fee of $15 per month for an offset costs $180 annually. If your offset balance averages $20,000 and your rate is 6.2%, the interest saved is around $1,240 per year, making the fee worthwhile. If your offset balance stays low, the fee may outweigh the benefit.

Refinancing to Improve Borrowing Capacity

Refinancing does not increase your income, but it can increase your borrowing capacity if you move to a lender with different serviceability policies or a lower interest rate. Some lenders apply more generous treatment to certain types of income, such as overtime, allowances, or rental income, which can result in a higher approved amount even at the same assessment rate.

For Service NSW employees considering refinancing, the timing depends on your current rate, your loan balance, and whether you need to access additional funds. If your current loan is on a fixed rate and you are still within the fixed period, break costs may apply. Those costs can run into thousands of dollars depending on how much rates have moved since you fixed.

If your goal is to access equity for an investment property or renovation, refinancing to a lender with higher serviceability can unlock that equity without requiring an income increase. Your broker can compare how different lenders assess your income and commitments to identify which one offers the highest borrowing capacity for your circumstances.

Call one of our team or book an appointment at a time that works for you. We will assess your income, calculate your borrowing capacity at current rates, and identify which lenders offer the most suitable products for Service NSW employees looking to purchase or refinance.

Frequently Asked Questions