Why the 6.9% rental surge is flipping the "major banks first" rule for investors

How the 6.9% rent rise rewrites the borrowing math

Major banks apply a conservative 20% haircut to gross rental income, anchoring that figure to a trailing average. In a flat market, this works. With rents climbing at 6.9%, this model traps equity your client should be using to scale. Take Sarah, a self-employed graphic designer with a $620k mortgage. Her lease jumped from $550/week to $605. A major bank using the 80% haircut credits her $440/week. A non-bank lender accepting the current lease credits her $484. That $44/week difference sounds small, but at a 6.59% rate with a 3% APRA buffer, it boosts her borrowing capacity by roughly $35,000 ¹.

The contrarian truth is that defaulting to a major bank for an investor with a recently re-leased property is the riskier move. You are leaving real dollars on the table. Choosing a lender that recognizes the current yield isn't just about speed. It is about reflecting the actual financial health of the asset. Don't let a stale calculator dictate the limit of your client's portfolio. If the numbers don't add up, the methodology is the first thing you should audit.

Non-bank policy agility as a serviceability lever

The primary difference in lender behaviour is evidence requirements. While major banks often mandate a 12-month rental history or rely on outdated tax return data, many non-bank lenders for brokers in Australia accept a current signed lease agreement or a property manager’s statement. In a market where yields jump every quarter, this agility is your best tool for navigating the APRA serviceability buffer.

Think of a client owning two investment properties in Melbourne’s north-west, both recently re-leased at market rates. His combined rental income rose from $72,000 to $78,000. Because major bank calculators apply their standard haircut to the old figure, his borrowing capacity remains flat. A non-bank lender using the current leases adds $4,800 in assessed net income, lifting his maximum new borrowing by approximately $60,000 ¹. This is often the difference between a client acquiring their next investment property or hitting a ceiling. Most brokers who ignore these secondary lenders are simply failing to do the math on what the client actually earns versus what the major bank assumes they earn.

Refinancing to unlock hidden capacity

Many investors remain trapped in fixed-rate loans originated in 2022–2023. These products rely on rigid, historical income recognition rules that ignore the 6.9% growth in market rent. By refinancing into a flexible non-bank product, you can unlock $30,000 to $50,000 in additional headroom without requiring the client to increase their deposit or take on more debt. The major bank isn't necessarily wrong; they are just slow. In a high-growth rental environment, that institutional lag is a direct cost to your client's long-term portfolio growth. If your client is capped out, your database is likely hiding a revenue surge that requires a lender shift.

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FAQs

How do major banks treat rental income when calculating borrowing capacity? Major banks typically apply a haircut of 20% on gross rental income, meaning only 80% is counted, and often anchor this to historical averages rather than current market rates.

Can I use a signed lease agreement to prove rental income for a new investment property? Yes, many non-bank lenders accept a current signed lease agreement as evidence of income, whereas major banks often require a 12-month history or completed lease period.

Does rising rental yield mean I can borrow more for my next investment property? Generally, yes, as higher rental income improves your debt-to-income ratio, provided the lender you choose accounts for the current yield rather than historical data.

What to do next

Before your next investor refinance call, pull the client’s current tenancy agreement and re-run serviceability with two scenarios: one using the major bank’s standard 80% haircut on the old rent, and one using a non-bank lender that accepts the new lease at 80%. This 10-minute exercise reveals the hidden capacity sitting in the portfolio. Once you identify the gap, target the non-bank loan products that match the real income.

If you're running scenarios like this and the document chase is eating your week, the Halo Fortune MM team handles the operational layer — Halo Flex covers self-employed alt-doc and low-deposit deals where the majors decline; Halo Chat (broker-only RAG, built by Halo Fortune) returns cited lender-policy answers in under 30 seconds.

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Related reading

• Why the major bank first rule is killing your self-employed refinance pipeline
• The $224 Billion Shift: Navigating Australia's Private Credit Surge
• Why residential brokers should diversify into smsf residential loan 2026

ACL 483923, ABN 51 167 597 122. MFAA / Comparator , https://www.mfaa.com.au/.

If you're running scenarios like this and the document chase is eating your week, the Halo Fortune MM team handles the operational layer , Halo Flex covers self-employed alt-doc and low-deposit deals where the majors decline; Halo Chat (broker-only RAG, built by Halo Fortune) returns cited lender-policy answers in under 30 seconds.

👉 Apply for Halo Fortune broker access , free, 5-minute submission →

Footnotes

1. Calculation based on 6.59% interest rate, 3% APRA buffer, 30-year term, 80% LVR. ↩ ↩²