How Changing Interest Rates Impact Your Borrowing Power

If you started 2026 with a mortgage pre-approval in hand, it is worth checking whether it still holds up. Interest rates and borrowing power move together, and 2026 has been a fast-moving year for both.

The Reserve Bank of Australia has lifted the cash rate multiple times and each move has quietly reduced how much Australians can borrow for a home loan, even for buyers whose income has not changed at all.

This guide walks through what has actually happened, why a small rate rise can have an outsized effect on your borrowing capacity, and what it means whether you are planning to buy, sell, rent out a property, or simply sit tight.

In keeping with realCLEAR’s approach, we provide real CLEAR honest property advice, so you can make your own decisions.

What Has Happened to Interest Rates and Borrowing Power in 2026

The RBA increased the cash rate three times in the first five months of 2026: a 25 basis point rise in February to 3.85 per cent, another 25 basis points in March to 4.10 per cent, and a third in May that took it to 4.35 per cent.

You can check the current cash rate and the RBA’s own explanation of each decision on the RBA’s cash rate target page.

Each of those rises flowed through to variable home loan rates within weeks, as lenders adjusted their pricing. According to Canstar, the estimated average variable rate for an owner-occupier loan sits at around 6.26 per cent as of August 2026. That is an average rate borrowers pay and for many they pay much more.

What lenders use to assess how much you can borrow is a different, higher figure, which is where the real squeeze comes from. Independent analysis by Canstar.com.au estimates that an average income earner’s maximum borrowing capacity may have fallen by around $35,400 since the start of the year, as a result of the three 2026 rate rises.

For a couple both earning average wages, the combined reduction is estimated at around $70,700. These figures assume a 30-year owner-occupier loan at the average new customer rate, with no existing debts or dependants, so an individual buyer’s own numbers will differ.

If a fourth rate rise had occurred, the reductions may have grown to roughly $46,300 and $92,500 respectively.

Why a Quarter-Point Rise Cuts So Much

It can seem strange that a 0.25 per cent rate rise removes tens of thousands of dollars from what someone can borrow. The answer lies in a rule set by the Australian Prudential Regulation Authority, the regulator that oversees bank lending standards.

APRA appears to require every regulated lender to test whether a borrower could still afford their repayments if their interest rate were three percentage points higher than what they are actually being offered. This is known as the serviceability buffer.

APRA confirmed in 2026 that the buffer remains at three percentage points, a level it has held since October 2021. You can read APRA’s own explanation on its announcement on macroprudential settings. So if your actual rate is 6.26 per cent, the bank tests your capacity to repay at roughly 9.26 per cent, not at the rate you would actually pay.

When the underlying rate climbs, that assessment rate climbs with it, and because loan serviceability is calculated over a 25 to 30 year term, even a small shift in the assessment rate changes the maximum loan size by a large amount. It is not just what you pay today that matters here, it is what a lender assumes you might pay under stress.

Illustrative Example: How the Numbers Add Up

The table below is a simplified illustration only, based on the Canstar analysis referenced above. It is not a quote from any lender and your own borrowing capacity will depend on your income, expenses, debts and the specific lender’s policies.

	Estimated borrowing capacity, January 2026	Estimated reduction after three 2026 rate rises	Approximate capacity today
Single average income earner	$540,000	Down about $35,400	$505,000
Couple, both average incomes	$1,080,000	Down about $70,700	$1,010,000

The pattern to notice is not the exact dollar figures, which will differ for every household, but the scale of the drop relative to income. A change in the cash rate that feels small in percentage terms can remove a meaningful slice of what a bank will lend, well before you have made any change to your own finances.

Example: Why Timing Matters Once You Have Finance Sorted

Rules around buying property differ from state to state, so this section describes how one specific process works in New South Wales. If you are buying elsewhere in Australia, check the equivalent rules with your own state or territory consumer affairs authority, because the details are not the same everywhere.

In NSW, once you exchange contracts on a residential property through a private treaty sale, you generally get a five business day cooling-off period, running from the time of exchange until 5pm on the fifth business day afterward.

During that window you can withdraw from the contract, but you will usually forfeit 0.25 per cent of the purchase price as a penalty, which works out to $250 for every $100,000. A longer, ten business day cooling-off period applies to off-the-plan purchases. There is no cooling-off period at all for auction sales, or for a contract exchanged on the same day as a passed-in auction.

NSW Fair Trading sets out the full detail on the NSW Government’s contracts and deposits page. Why does this matter here? Because a pre-approval obtained even a few weeks earlier may no longer reflect what a lender will actually approve if rates have moved since then.

A NSW buyer who exchanges contracts assuming their earlier pre-approval still stands, only to find their final loan approval comes in lower, has a short and legally binding window to act. Confirming your finance is still current before you exchange, not after, avoids that scramble.

Other states run comparable but different cooling-off systems, so always confirm current requirements with your own state authority before signing anything.

What This Means If You Are Buying, Selling, Renting, or Holding

A tighter borrowing environment affects each situation differently, and none of them is automatically the “right” move.

1. If you are buying: It is worth getting a fresh assessment of your borrowing capacity rather than relying on a pre-approval issued before the recent rate rises. A mortgage broker or your bank can recalculate this quickly.
2. If you are thinking about selling: Reduced borrowing power among buyers can affect how quickly a property sells and how much competition there is for it, though this varies significantly by location and property type. If you are weighing up whether now suits your circumstances, our guide to selling your property covers the practical steps without any pressure to list before you are ready.
3. If you are considering renting instead of buying: Higher borrowing costs for landlords can influence rental markets over time, though the relationship is not immediate or uniform across suburbs. You can explore current options.
4. If you already own an investment property: Understanding how rate movements affect your own serviceability, and your tenants’ household budgets, is worth revisiting periodically. Our property management page outlines what ongoing management involves.
5. If you are simply holding and doing nothing: That is also a completely valid response to a rate rise. Not every situation calls for action, and reacting to short-term rate movements is not always in your interest.

* Frequently Asked Questions

• Does a higher cash rate always mean I can borrow less?
  • Generally yes, because lenders assess your capacity using your interest rate plus the APRA buffer. As your assessed rate rises, the maximum loan size for the same income and expenses typically falls. The exact amount depends on your personal finances and your chosen lender.
• How often does the RBA review the cash rate?
  • The RBA’s Monetary Policy Board meets eight times a year to decide on the cash rate. Decisions are announced at 2.30pm following each meeting, with any change taking effect the next day.
• Is the APRA serviceability buffer the same for every lender?
  • The three percentage point buffer is a minimum standard that applies across all APRA-regulated lenders. Individual lenders can apply their own additional overlays and expense benchmarks on top of it, which is why borrowing capacity can vary between banks for the same applicant.
• Will my existing mortgage repayments increase because of these rate rises?
  • If you are on a variable rate, your lender’s advertised rate typically moves in line with cash rate changes, which affects your repayments. If you are on a fixed rate, your repayments stay the same until your fixed term ends. Check your loan documents or contact your lender directly to confirm how your particular loan is affected.
• Should I fix my rate to avoid future rises?
  • This depends on your personal risk tolerance, how long you plan to hold the loan, and where fixed rates currently sit relative to variable rates. It is a decision worth discussing with a mortgage broker or your lender.
• Does a rate rise affect how much deposit I need?
  • Not directly. Deposit requirements are usually set as a percentage of the purchase price by your lender, separate from the serviceability test. However, a smaller maximum loan size can change what purchase price is realistic for a given deposit.
• Can I still buy if my borrowing power has dropped?
  • Often yes, though it may mean adjusting your price range, exploring different lenders with different servicing policies, or reviewing your existing debts and expenses, since these all feed into the serviceability calculation.
• How is a couple’s borrowing power assessed compared to a single buyer?
  • Lenders combine both incomes and both sets of expenses and liabilities when assessing a joint application. This generally increases the maximum loan size compared to a single applicant, but it also means changes in either partner’s income or debts affect the outcome.
• Where can I check the current official cash rate myself?
  • The RBA publishes cash rate decisions and the full historical series on its website, linked earlier in this article, along with the statement explaining the Board’s reasoning after each meeting.
• Does a falling property price offset a lower borrowing capacity?
  • Not necessarily, and not evenly. In some markets, falls in borrowing capacity have outpaced falls in property prices, meaning affordability has not automatically improved even where prices have softened. This varies by location and should not be assumed without checking local data.

* Wrapping Up

Interest rates and borrowing power are closely linked, and 2026 has shown how quickly that relationship can shift. Three rate rises in five months have measurably reduced what average income earners and couples can borrow, through a mechanism, the APRA serviceability buffer, that most borrowers rarely think about until it affects them directly.

None of this means you need to rush into a decision. Whether the right move for you is to buy now, wait, sell, rent, or simply leave things as they are depends on your own circumstances, not on a headline about the cash rate. realCLEAR’s approach has always been to give you the facts and let you weigh them yourself, because we would rather lose a listing than give you advice that does not fit your situation.

If you would like to talk through what your current numbers actually mean for your specific circumstances, with no obligation and no sales pitch, you can book a free conversation through our Contact Us page. We will talk through your numbers honestly, even if the honest answer is that now is not the time to act.

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Disclaimer: This article provides general information only and is not personal financial, legal or tax advice. Borrowing capacity figures are estimates based on Canstar’s published analysis and will differ for every individual. Speak with a licensed mortgage broker, financial adviser or your lender directly before making decisions about your own finances.