Why You Can Borrow Less in 2026: The 3% Buffer, the New 6x DTI Cap, and How to Lift Your Number

The bank says you can borrow less than it did in January. Here's why.

If you had your borrowing capacity worked out late last year and you've just had it redone, there's a good chance it came back smaller - possibly a lot smaller. Nothing about you has changed. Your income is the same, your job is the same, you've been saving away. But the number moved.

That isn't a mistake, and it isn't your lender being difficult. Two things happened this year: the Reserve Bank lifted the cash rate three times, and the regulator quietly added a new limit on top of the old one. Between them, they've reshaped what banks will lend.

I spent eight years in lending, including time at CBA, before becoming a broker. Serviceability is the part of this job clients find the most opaque and the most frustrating - so here's the plain-English version of what's driving your number in 2026, and the practical levers that actually move it.

First, the rate rises

The RBA raised the cash rate three times in the first half of 2026, taking it to 4.35%, and then held it steady at the June meeting. The next decision is due in August.

Higher rates don't just lift your repayments - they shrink the loan a lender will approve in the first place. One analysis this year put the hit at roughly $35,800 off a single borrower's maximum loan on an average full-time wage, and around $71,600 for a couple. Your own figure will differ, but the direction is the same for everyone: the same income now supports a smaller loan than it did in January.

Second, the buffer - the number behind the number

Here's the bit most people don't know. A lender does not assess you at the rate you'll actually pay. It assesses you at your rate plus a 3 percentage point buffer - a rule set by APRA, the banking regulator. APRA has confirmed that buffer stays at 3 percentage points.

So if you're being offered a variable rate somewhere around 6% to 6.5%, which is roughly where a lot of owner-occupier variable rates sit at the moment, the bank is testing whether you could still make the repayments at about 9% to 9.5%. Every dollar of your capacity is stress-tested at that higher number.

That can feel harsh when you're the one budgeting carefully. The logic is that a 30-year loan will meet a few rate cycles, and the buffer is there so a rise doesn't tip you over. Whether or not you love it, it's the rule - and it's why your borrowing power falls further and faster than the rate rise alone would suggest.

Third, and new this year: the 6x debt-to-income cap

This is the change most buyers haven't heard about. From 1 February 2026, APRA limits how much high debt-to-income lending a bank can write. Specifically:

• A loan counts as high DTI when your total debt is six times or more your gross (before-tax) income.
• Lenders can now write no more than 20% of their new mortgage lending at that level.
• The cap applies separately to owner-occupier and investor lending, and is measured quarterly.
• Bridging loans for owner-occupiers, and loans to buy or build a new home, are excluded.

An important nuance: this is not a ban. A loan above 6x DTI is still perfectly allowed - the bank is simply limited in how many of them it can write. In practice, high-DTI lending gets rationed. Some lenders fill their quota and get fussy; others still have room. Two lenders can look at an identical file and give you a different answer, purely because of where they sit against their own cap that quarter.

Some rough maths to make it concrete: a household on a $150,000 gross income reaches 6x at around $900,000 of total debt - and that is total debt, not just the new mortgage. A car loan, your credit card limits and any existing home loan all count towards it.

If you're an existing borrower and you're not touching your loan, none of this affects you. It only bites when you borrow again - including when you refinance.

What this actually means for you

• Get a fresh number before you shop. A capacity figure or pre-approval from six or twelve months ago may no longer be real. There's nothing worse than bidding on the strength of an old number.
• Lender choice matters more than it used to. Assessment floors, how bonus, overtime and casual income are treated, living-expense benchmarks, how HECS is handled, and how much DTI headroom a lender has left - all of it varies. The gap between the most and least generous lender on the very same file can be large. This is exactly where access to more than 70 lenders earns its keep.
• If you're building or buying new, you have more room. Loans to buy or construct a new dwelling sit outside the DTI cap - a genuinely useful quirk if your numbers are tight.

Six levers that actually lift your borrowing power

None of these are tricks. They're simply the things lenders measure, which makes them the things you can change.

• Reduce or close credit card limits. Lenders assess your limit, not your balance. A $20,000 card you never touch and clear every month still cuts what you can borrow - often by tens of thousands. Lower the limit or close the card.
• Clear the small stuff. A car loan, a personal loan or a couple of buy-now-pay-later accounts eat capacity out of all proportion to their size, because a monthly repayment gets carried across a 30-year assessment. Paying out a small debt before you apply is often the single highest-return move available to you.
• Tidy your spending for three months. Lenders benchmark your declared living expenses against a minimum (the HEM). If your statements show heavy discretionary spending, they'll use the higher figure. The three months before you apply are the ones they'll read.
• Get your income presented properly. Overtime, bonus, commission, casual shifts, a second job, self-employed income - lenders differ enormously in what they'll accept and how much of it they'll count. A lot of "lost" capacity is really just income being presented to the wrong lender.
• Look at the loan term and structure. A longer term lowers the assessed repayment. It isn't free - you pay more interest over the life of the loan - but it's a legitimate lever when capacity is the binding constraint.
• Know where you sit on DTI before you apply. If you're near 6x, the lender you choose can be the difference between an approval and a decline. That's a conversation worth having before your file goes anywhere.

One thing I'd gently push back on

Everything above is about lifting the ceiling. It's worth remembering that the ceiling is not the target.

The buffer exists because rates move, and this year they moved three times. Borrowing the absolute maximum a lender will allow leaves you no room if the next move is up again, or if your circumstances change. I'd far rather help you borrow an amount you can live with comfortably than the biggest number a calculator will produce. A loan you can sleep on is worth more than a loan that technically got approved.

The bottom line

Your borrowing power in 2026 is set by three things stacked on top of one another: the rate, the 3 percentage point buffer applied on top of it, and now the 6x debt-to-income cap sitting over the whole market. Three rate rises this year have pulled the number down for just about everyone.

But the range between lenders is wide, and the levers above are real. I've seen the same file come back with a materially different answer simply because it went to the right lender, with the credit card limits dealt with first.

If you'd like to know what you can actually borrow right now - not what you could last year, and not a rough online guess - I'm always happy to have a free, no-obligation chat. With access to more than 70 lenders, I can work out which one reads your situation most favourably, and what we'd want to tidy up beforehand.

This is general information only and not personal financial advice - everyone's situation is different, so please get in touch and we'll look at yours together. Interest rates, lender policy and regulatory settings can change, so treat the figures here as a snapshot in time, and for any tax questions please speak to your accountant or a licensed adviser.

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