The RBA decides at 2:30pm AEST today, with markets pricing an 86% probability of a 0.25% hike taking the cash rate to 4.35%. If that lands, it is the third hike of 2026 and the fully reversed 2025 cycle plus a quarter on top. For property investors, the borrowing capacity number is moving more than the cash rate is, and that is the figure that decides what you can buy from here.
A two-hike cycle has already trimmed roughly $48,000 off a dual-income couple’s investment lending capacity in 2026. A third hike today takes that closer to $72,000.
How banks calculate your number
Three numbers do almost all the work.
Your assessed loan rate. The bank starts with the actual product rate, then adds APRA’s serviceability buffer of 3.0 percentage points. The average variable investment loan in April 2026 sits around 7.0%. Add the buffer and the assessment rate is roughly 10.0%. Every dollar you borrow is tested at that rate, not the rate you actually pay.
Your debt-to-income (DTI) ratio. Most banks cap total lending at 6 times gross household income. Some have tightened to 5 times for investment loans. From 1 February 2026, APRA-regulated lenders can issue no more than 20% of their new investment loans to borrowers with a DTI above 6. That cap is now actively shaping which deals get approved.
Your existing commitments. Other loans, credit card limits (banks assess at the limit, not the balance), HECS, dependants, and existing rental income haircuts all reduce the income the bank counts. Investment property rent is typically shaded by 20-25% to allow for vacancy and costs.
The combination of these three is your real ceiling. The cash rate moves the assessed loan rate, which moves capacity. The DTI cap creates a hard ceiling that even high earners now run into.
What each 0.25% hike actually costs you
Canstar’s analysis on the most recent hike puts the per-hike capacity loss at:
- Roughly $12,000 off a single average-income borrower.
- Roughly $24,000 off a dual-income couple.
The cumulative number across the 2026 cycle matters more than any single hike. If today’s decision goes through:
| Borrower | After Feb hike | After March hike | After May hike (4.35%) |
|---|---|---|---|
| Single (avg income) | -$12,000 | -$24,000 | -$36,000 |
| Couple (dual income) | -$24,000 | -$48,000 | -$72,000 |
That is approximately $72,000 less capacity for a couple in three months. For a buyer who pre-approved before February, those numbers explain why the property they were chasing is now out of reach without rebalancing the deposit.
Where most investors run into a wall
The cash rate is the headline. The DTI cap is the quieter constraint, and it bites earlier than most investors realise.
Take a couple on $200,000 combined gross income. At a 6x DTI cap, total lending sits at $1.2 million. If they already have an owner-occupier mortgage of $700,000, their additional investment lending capacity is $500,000, regardless of how comfortably they could service more on paper. A growing portfolio runs into this cap before it runs into a rate ceiling.
Some lenders will assess investment property rental income inside the DTI calculation, which extends the runway. Others will not. Lender choice has become a strategy decision in 2026, not just a question of who offers the lowest rate.
Lifting your capacity from here
A few things still move the needle.
Refresh your pre-approval often. Borrowing capacity now resets every six to eight weeks as rates move and lenders re-assess. A pre-approval from before February is almost certainly stale. A six-week old number is still in the right ballpark.
Choose your lender deliberately. Lender policies on rental income shading, casual income, bonuses, share dividends, and trust distributions vary widely. Two lenders looking at the same applicant can produce capacity numbers $100,000 apart. A good broker shops the policy fit, not just the rate.
Reduce stated commitments where possible. Credit card limits assessed at the limit, not the balance. Cancel cards you do not use. Pay down high-interest consumer debt before applying. Even a $10,000 credit card limit reduction can lift capacity by $40,000-$60,000.
Consider interest-only loans on investment lending. Lower assessed monthly repayments improve the serviceability calculation. Across two or three IO investment loans versus P&I, the difference can unlock $50,000-$100,000+ in additional capacity. The trade-offs are real, so this is not for everyone. Talk to your broker and accountant.
Avoid lender cross-collateralisation. Each property securing each loan independently keeps your structure flexible and your capacity portable. Cross-securitised structures lock you into a single lender and reduce future options.
Stay below the 6x DTI line where possible. Once you cross 6x, your lender pool shrinks materially. A purchase that takes you from 5.8x to 6.2x might be the wrong purchase right now, even if the property itself stacks up.
What we are doing for clients
The borrowing-capacity squeeze is the single biggest theme in client conversations this month. A few patterns:
We are checking pre-approvals at the broker before going under contract. A 48-hour broker check before exchange has saved more than one client this year from a finance fall-through.
We are pushing harder on yield. A 3.1% yield property in Sydney’s premium suburbs was a marginal investment at 5.50% loan rates. At 7.0%, it is bleeding. We are screening for growth and yield together more aggressively, not either-or.
We are buying in the affordable corridors. The lower quartile data is the clearest signal in the market right now. The April 2026 numbers showed Sydney’s lower quartile up 2.9% year-to-date while the upper quartile fell 3.3%. That reflects exactly what borrowing-capacity compression does.
We are pacing the portfolio. A purchase a year through a tightening cycle beats two purchases now that max out capacity and lock you out of the next opportunity. Compounding only works if you can keep buying.
The read
Borrowing capacity in 2026 is being squeezed from two sides. The RBA is moving rates up, which compresses the serviceability number on every loan. APRA tightened the DTI rules in February, which caps the total lending banks will write. Investors who treat their capacity number as a static figure are getting caught short. Investors who treat it as a moving target, refresh often, and pick their lender deliberately are still buying.
If you want a current read on your specific capacity number across two or three lender scenarios, talk to your broker before you talk to anyone else. That is the call that decides what comes next.
This is general information only and not financial or lending advice. Borrowing capacity numbers are indicative and depend on your specific lender, income mix, and existing commitments. Speak to a qualified mortgage broker for a current assessment.
If you want a strategy that maps your capacity to the right markets, book a free discovery call.
