Are you one of the many first time home buyers in Melbourne’s west who worked out a budget back in January? It is worth checking that number again. It has probably shrunk.
The cash rate was raised three times by the Reserve Bank of Australia in the first half of 2026. Variable home loan interest rates moved with the cash rate, so they went up too. And every lender’s calculator quietly moved with them.
None of that means buying your first home in Wyndham, Melton or Brimbank is off the table. Plenty of first time home buyers are still settling out here every week. It just means your plan, like every first home buyer’s plan this year, needs to be built around today’s numbers instead of January’s.
Short answer: When interest rates go up, lenders don’t test you at the rate you will actually pay, so you can’t borrow as much. They test you at your rate plus a 3 percentage point safety buffer set by the banking regulator. The cash rate climbed 0.75 percentage points across three rises in 2026, and that test rate climbed with it. So the largest loan your income can support got smaller, even though your income never changed.
What changed for people buying their first home in 2026?
The cash rate is set by the Reserve Bank eight times a year. In 2026 it lifted that rate three times, at its meetings on 2–3 February, 16–17 March and 4–5 May.
At the following meeting on 15–16 June, the Board left the cash rate unchanged at 4.35 per cent. That decision was unanimous.
The Reserve Bank was also clear about where things stand. It said inflation was still too high, and that it would lift the cash rate further “if required”. It also noted that momentum in the housing market has shifted, with prices falling in some capital cities.
The next decision will be made on 11 August 2026, which is less than a week after this article was published. So first home buyers house-hunting right now are doing it in the gap between two decisions.
How lenders really work out your borrowing power
This is the part most first time home buyers are never told. It is also the whole reason rising interest rates hurt so much.
The good news: once first home buyers understand it, they can plan around it.
A banker doesn’t ask, “At what interest rate can you afford to pay back the loan?”
It asks, “could you still afford the repayments if your rate went up by 3 percentage points?”
That extra 3 points is called the serviceability buffer. It is set by APRA, the government body that regulates Australian banks. On 28 May 2026, APRA confirmed the buffer would stay at 3 percentage points.
So there are really two interest rates in every home loan application.
The two rates in every home loan application
Only one of them decides your maximum loan, and it is not the one you pay.
The buffer sits on top of your real rate. So every cash rate rise pushes both bars to the right, and it is the lower bar that sets your limit.
APRA confirmed on 28 May 2026 that the serviceability buffer of 3 percentage points would remain in place. Individual lenders may apply a higher buffer or a minimum floor rate.
It’s kind of like how much weight a bridge can hold. That limit is not set at the heaviest truck that can cross on a good day. They set it well below, so the bridge still holds up on a bad one.
The buffer does exactly the same job for your loan. It is there to make sure you could cope if rates rose again.
Here is why 2026 stung. The cash rate rose 0.75 percentage points in total. Home loan interest rates rose too. And because the buffer sits on top of your real rate, your test rate climbed by roughly the same amount.
Same income. Same expenses. Higher test rate. Smaller mortgage borrowing capacity.
That is the squeeze first home buyers are feeling right now. Nothing about your own situation got worse. The test that first time home buyers face simply got harder.
It is also why home loan affordability can feel worse than the headlines suggest. Your repayments are based on your real rate. Your budget is based on the test rate.
The second change most buyers have not heard about
Rising interest rates were not the only rule change this year.
From February 2026, APRA brought in a new limit on high-debt lending. Banks can now write only 20 per cent of their new mortgages to high-debt borrowers. “High-debt” means total debt of six times your gross income or more.
That is a cap on the bank’s whole loan book, not a ban on your particular loan. But it changes things in practice. Lenders are now more careful about who they let borrow near the very top of their capacity. And each lender has a different amount of room left under its quota.
Most first home buyer loans sit comfortably under six times income. But a HECS-HELP debt, a car loan or a high credit card limit can quietly push you towards that line. A credit card limit counts against your borrowing capacity even when the balance is zero, lenders assess the limit you have available, not what you owe.
Free, no-obligation, and built for first home buyers. We check against the rules lenders are using this month, not the number you worked out in January.
What this means across Melbourne's west
For new home buyers, Melbourne’s west has long been the pragmatic choice. That has not changed. What has changed is which part of the west fits your number.
The west is really two corridors, and they behave quite differently.
Down the Werribee and Geelong lines, the City of Wyndham takes in Williams Landing, Point Cook, Tarneit, Hoppers Crossing, Werribee and Wyndham Vale. Out along the Sunbury and Melton lines, Brimbank and the City of Melton cover Sunshine, St Albans, Deer Park, Caroline Springs, Aintree and Cobblebank.
The two western corridors, by type of housing stock
Where the new builds are matters more than it used to. Here is why.
Schematic, not to scale. Ordered roughly by distance from the CBD. Suburb-to-council boundaries confirmed against the City of Wyndham and City of Brimbank official sites, and the City of Melton official site. Rail line detail confirmed against the Victorian Government’s Melton Line Upgrade project page.
The pattern is simple enough. The suburbs closer to the city and the bay – Point Cook, Williams Landing, Altona, Yarraville- are largely built out. What you buy there is an existing home, and usually at an established-suburb premium.
Further along both corridors, the growth areas are still going up. Tarneit, Truganina, Wyndham Vale, Rockbank, Aintree, Deanside and Cobblebank all have new estates, house-and-land packages, and blocks you can build on.
When borrowing power tightens, that difference stops being a matter of taste. For first home buyers, it becomes part of the plan.
Why new builds matter more than they used to
Two of the biggest government schemes for new home buyers treat new homes differently from established ones, which catches entry-level home buyers out constantly.
The Victorian First Home Owner Grant only applies to a home that is new or has never been lived in. Buy an established house, and you cannot claim it, however much you love the place. The current rules, thresholds and eligibility tests are on the State Revenue Office of Victoria (https://www.sro.vic.gov.au/buying-property/first-home-owner-grant) website.
Then there is the First Home Guarantee — the Australian Government scheme most first home buyers know as the 5% deposit scheme. It lets eligible entry-level home buyers purchase with a deposit as small as 5 per cent and avoid paying lenders’ mortgage insurance. It covers existing homes, new homes, townhouses, apartments, house-and-land packages, off-the-plan purchases, and vacant land with a building contract.
That scheme has changed in your favour, too. From 1 October 2025, Housing Australia removed the cap on how many places were available and scrapped the income limits entirely. Property price caps were lifted at the same time, and the separate regional scheme was folded into the main one.
Each area has its own price cap. Check the postcode you are targeting on the Australian Government’s first home buyer site before you fall for a listing.
Put those two things together and something useful appears. In the western growth corridor, the new-build stock, the grant rules and the deposit scheme all line up. Few parts of Melbourne can say that. It is worth knowing before new home buyers narrow their search.
Five steps to take before you keep house-hunting
None of this is a reason for first home buyers to give up. It is a reason to work from an accurate number. Here is the order we would walk a client through right now.
Get a current number, not a January one
Start with the free, independent mortgage calculator on Moneysmart , run by ASIC, to get a rough idea. Then have a broker run your real income, expenses and debts through actual lender systems. A generic borrowing power calculator and a lender's own model can give surprisingly different answers.
Ask what test rate was used
Whenever anyone gives you a maximum loan figure, ask one follow-up question: what rate did you test me at? If nobody can tell you, the number is a guess, and guesses fall apart at auction.
Tidy up the small debts first
Credit card limits count against you even with nothing owing on them. So do buy-now-pay-later accounts, car loans and personal loans. Closing or reducing what you do not really need is often the quickest way to lift your borrowing capacity without earning a cent more.
Re-check the schemes at your new budget
This one surprises people. A smaller budget can move you back inside a price cap rather than outside it. Check the cap for your target postcode first. Then check the Victorian duty concessions separately, because the two sets of rules are not the same.
Compare lenders before you compare properties
Lenders use different living-expense benchmarks, and they treat overtime, bonuses, casual income and HECS-HELP debt differently. The same household can get materially different answers from two lenders. Sorting that out first saves you months of looking at the wrong houses.
One more thing worth saying plainly: a home loan pre-approval is not a locked-in promise. It reflects today’s rate and today’s circumstances, and it runs for a limited time.
It is also usually reassessed if the cash rate moves or your situation changes. Useful, but not a guarantee.
The bottom line
What we would tell a client this week
Three cash rate rises in 2026 have genuinely reduced what first home buyers can borrow. That is real, and it is better to plan around it than to wait for it to reverse.
But the west is still the west. It holds the newest housing stock in the city and the most house-and-land options. It also has the best overlap with the schemes built for first time home buyers.
The buyers who do well from here are not the ones who guessed. They are the ones who got an accurate number, checked it against real lender rules, and then went looking.
If you would like that number worked out properly, the team at Credit Hub can go through it with you. It costs nothing to ask. And it beats falling in love with a house you cannot finance.
Frequently Asked Questions
Why has my borrowing power dropped in 2026?
Because the cash rate went up, the Reserve Bank raised it three times in 2026, in February, March and May, then held it at 4.35 per cent in June. Home loan interest rates moved up with it. Lenders must test you at your actual rate plus a 3 percentage point buffer. So a higher rate means a higher test rate. And a higher test rate means a smaller maximum loan.
What is the serviceability buffer, and why does it matter so much?
It is an extra amount lenders must add to your interest rate when they check whether you can afford a loan. APRA requires a buffer of at least 3 percentage points, and confirmed on 28 May 2026 that it would stay there. In short: the bank is not asking whether you can afford today’s rate. It is asking whether you could still cope if rates were 3 points higher.
What is APRA's new debt-to-income limit?
From February 2026, banks can write only 20 per cent of their new mortgage lending to high-debt borrowers. “High-debt” means total debt of six times your gross income or more. It caps the bank’s overall book rather than banning individual loans, so different lenders have different room left. Most first time home buyers sit under six times income. But a large HECS-HELP debt, a car loan or a high credit card limit can push you closer to that line.
Does a home loan pre-approval lock in my borrowing power?
No. A pre-approval shows what a lender is likely to lend based on today’s rate and your current circumstances. It is not a guarantee. Pre-approvals run for a limited period only. They are usually reassessed if the cash rate moves, your income changes, or you take on new debt. First time home buyers should treat a pre-approval as a planning tool, not a promise.
Can a mortgage broker improve my borrowing power without me earning more?
Sometimes. Lenders use different living-expense benchmarks. They also treat overtime, bonuses, casual income, HECS-HELP debt and credit card limits differently. That means the same household can get different answers from different lenders. A broker comparing several lenders can sometimes find a higher figure for first time home buyers in the same situation. It depends on your circumstances, though, and is never guaranteed.
Book a free 15-minute call. We check first home buyers against current lender rules, then match the number to the suburbs in the west that fit today.
⚠️ General advice disclaimer: This article contains general information only. It does not take into account your personal financial situation, needs or objectives, and it is not financial or credit advice. Interest rates, government scheme rules and price caps change, so confirm current details with the official sources linked above before you act. Before making any borrowing decision, get a personalised assessment from a licensed mortgage broker or financial adviser. Credit Hub Australia holds an Australian Credit Licence 472959.
