Buying your first investment property is often the easy part. By the third or fourth, many investors find lenders saying no, even when they have plenty of equity. The constraint is usually serviceability, not equity.
The main limits
1. Serviceability
Every new loan adds repayments that lenders test at about 3% above the actual rate. Rental income is usually shaded to 70% to 80%. Over several properties, the gap between assessed repayments and assessed income grows.
2. Debt-to-income limit
Since February 2026, APRA has limited banks' lending at DTI of 6 or more to 20% of new loans, applied separately to investor and owner-occupier portfolios. Investors with large portfolios often have DTIs above 6.
3. Lender exposure caps
Some lenders limit how much they'll lend to one borrower, or how many properties they'll finance for one person.
4. Interest-only expiry
Lenders assess IO loans on P&I repayments over the remaining term. Many investors have loans moving from IO to P&I at different times, which squeezes serviceability.
How investors keep growing
Choose the right lender order
Lenders assess existing debts differently. Some use your actual repayments; others use a buffered rate on all debts. Using the "generous" lenders at the right stage can extend your borrowing capacity.
Improve yield
Higher-yield properties improve serviceability. A portfolio entirely of low-yield, high-growth properties hits limits faster.
Pay down non-deductible debt
Reducing your home loan improves serviceability and reduces DTI.
Avoid cross-collateralisation
Stand-alone securities make it easier to move loans between lenders when needed.
Use non-bank lenders strategically
Non-bank lenders aren't bound by APRA's DTI limit and may use different assessment methods. Rates are often higher.
Consider structure
Some investors buy through trusts or companies. Lending is more complex and expensive, but it may suit some strategies. Get legal and tax advice first.
The 2027 tax changes
For established properties bought after 12 May 2026, negative gearing benefits are limited from July 2027. That changes the cash flow maths for growth-focused portfolios. Many investors are reassessing strategy, looking at new builds or higher-yield purchases.
Plan before you need it
A broker can map out your lending path, showing which lenders to use and when. Getting the order wrong early on can cap your portfolio at two or three properties.
Frequently asked questions
How many investment properties can I have?
There's no fixed number. It depends on your income, rents, debts and lender policies.
Does rental income count fully?
Usually 70% to 80%. Some lenders count more for certain property types.
Should I sell to buy more?
Sometimes rebalancing helps. Selling costs and tax need careful consideration.
Building a portfolio? Call Finfident on 0424 545 654. We'll map out a lending strategy so you're not stuck after property two.
This article is general information only and doesn't take into account your objectives, financial situation or needs. Figures, rates and scheme rules are current as at October 2026 and can change. Finfident Finance Brokers (ABN 94 679 280 801) is Credit Representative 569374 of Outsource Financial Pty Ltd (ACN 131 090 705), Australian Credit Licence 384324.