Borrowing Power After Rate Rises: Australian Income Examples for 2026

Why rate rises hit borrowing power twice

Interest-rate rises affect buyers in two separate ways.

First, the real repayment on a new loan gets higher. Second, the lender does not assess you at the advertised rate. Australian lenders usually apply a serviceability buffer above the actual rate when testing whether you can afford the loan.

That means a rate rise can reduce borrowing power faster than many buyers expect. A buyer may still feel comfortable with the visible repayment, but fail the lender's internal assessment.

Use the Borrowing Power Calculator for a full estimate and the Rate Change Impact Calculator to test repayment sensitivity.

The basic serviceability logic

Lenders do not simply ask whether your current income covers today's repayment. They estimate:

Net income - living expenses - existing debt commitments - assessed mortgage repayment

The assessed repayment is usually calculated at a higher rate than the loan rate. If the loan rate rises, the assessment rate rises too.

This is why a 0.25% rate rise can feel small in isolation but still reduce the maximum approved loan.

Example 1: single buyer on $90,000

A single buyer earning $90,000 may have stable income and modest expenses, but the assessment is sensitive to:

• HELP/HECS repayments.
• Car loans or personal loans.
• Credit card limits, even if unused.
• Rent paid while applying.
• Living expense benchmarks.

After rate rises, the buyer may need to reduce target price, increase deposit, clear debt or choose a lower-cost location.

The practical move is to run borrowing power before inspecting, then test repayments with a 0.5% and 1.0% rate increase.

Example 2: couple on $160,000 with children

A couple earning $160,000 may assume two incomes create a large borrowing ceiling. The lender may still reduce available surplus because family living expenses, childcare and existing debts absorb cash flow.

In this household, rate rises interact with expenses. A higher assessed repayment plus childcare can reduce borrowing power even when gross income looks strong.

For this buyer type, compare three scenarios:

1. Current debts unchanged.
2. Credit card limits reduced.
3. Car loan or personal loan cleared before application.

The difference can be material because lenders assess commitments monthly.

Example 3: investor with rental income

Investors face a different test. Lenders may shade rental income, include negative gearing add-backs differently and assess existing investment debt at buffered rates.

Rate rises can therefore reduce borrowing power across the whole portfolio, not just the next purchase.

If the investor is buying in a land-tax-heavy state, annual holding costs also matter. Model cash flow in the Rental Yield Calculator, then check annual land tax with the Land Tax by State tool.

Levers that can improve borrowing power

Reduce existing debt

Paying down or closing high-limit credit cards can help, because lenders often assess the limit rather than the current balance.

Car loans and personal loans are also powerful because they are fixed monthly commitments. Clearing one can improve serviceability more than saving the same amount as extra deposit.

Increase verified income

Base salary is easiest to use. Overtime, bonus, commission, casual income and self-employed income may be shaded or require longer evidence periods.

If income is variable, organise documents before application.

Increase deposit

A larger deposit reduces the required loan and can avoid LMI. This helps both repayment affordability and lender risk settings.

Use the Deposit Savings Calculator and LMI by Property Price tool to compare saving longer against buying sooner.

Buy at a lower price point

The cleanest serviceability fix is often a smaller loan. Compare city and suburb options before committing emotionally to one price band.

What to do after every RBA decision

Each time rates move, update four numbers:

1. Current repayment.
2. Repayment after a 0.5% increase.
3. Repayment at the lender buffer.
4. Borrowing power with current debts included.

This turns rate news into a practical buying decision.

Best next step

Use this sequence:

• Rate Change Impact Calculator
• Borrowing Power Calculator
• Mortgage Repayment Calculator

General information only. Lenders use different policies, buffers, expense models and income shading rules, so pre-approval is the only way to confirm a specific limit.