How Many Investment Loans Can You Have in South West Sydney, NSW, What the DTI Cap Actually Limits

If you already own one investment property and you're thinking about a second, you've probably started to wonder whether there's a number that makes lenders stop. The honest answer is that there isn't a published limit, but there is a practical one, and it's not about how many properties you have. It's about how much debt you're carrying relative to your income.

Around the Moorebank intermodal precinct and across the Liverpool corridor, investors have been building portfolios steadily over the past few years, drawn by the combination of sub-$1.5 million entry points and strong rental demand. What trips most of them up isn't the second loan. It's the third or fourth, when the same serviceability mechanics that worked fine at two properties start to close doors at banks whose high-DTI quota is already stretched.

Our team works with investors across South West Sydney, NSW on exactly this, comparing across 40+ lenders to find the one whose policy fits where you actually sit. The investment loan structure you choose from the first property shapes how far you can scale, and it's worth getting that right before you're already in the middle of a purchase.

Is there a legal limit on how many investment loans you can have?

There's no law that caps the number of investment loans an individual can hold in Australia. What limits you is serviceability, and more specifically since February 2026, the APRA debt-to-income cap that now governs how much high-ratio lending an authorised deposit-taking institution can write. Your ceiling is wherever your debt-to-income ratio crosses six times your gross annual income, and a given lender has written enough high-DTI loans to fill its 20% quota for the quarter.

How do lenders actually assess multiple investment loans in South West Sydney?

Lenders don't count the properties. They count the debt. Your DTI is your total debt, including every mortgage balance, every credit card limit and every HECS repayment, divided by your gross annual income. APRA data shows that once that ratio hits six times income, an authorised deposit-taking institution can write only so much of it before breaching its allocation. When a lender's investor pool is full for the quarter, the same borrower who would have been approved in January might be declined in March, through no change in their own position.

Rental income helps, but it's shaded. Most lenders count around 80% of gross rent from your existing properties when assessing what you can borrow next, and they add the holding costs on top. A portfolio with three properties and modest rents can look very different to a lender depending on which of those properties carry interest-only periods, because the IO balance isn't reducing, so the DTI stays elevated for longer.

What do you need to qualify for each additional investment loan?

Each additional loan goes through the full serviceability assessment as if it were a new application, with one important difference: the existing portfolio is now part of the picture. Here's what lenders verify at every additional property:

What lenders check on each application:

• › Gross income evidence: current payslips or two years of tax returns for self-employed borrowers, plus any rental statements for existing properties.
• › Total debt position: every loan balance, every credit card limit and any HECS repayment obligation included in the DTI calculation, regardless of what's actually being drawn.
• › Rental income shade: most lenders accept around 80% of gross rent from investment properties already held, then deduct holding costs separately.
• › Loan structure of existing properties: interest-only loans keep the balance flat, so the DTI stays higher for longer than a principal-and-interest loan at the same original amount.
• › Credit card limits: assessed as fully drawn at roughly 3% to 3.8% of the limit per month, regardless of the actual balance, so unused limits are a hidden drag on capacity.

Source: APRA.

What does a growing portfolio cost to build in South West Sydney, NSW?

CoreLogic data shows South West Sydney entry points are genuinely varied across the approved suburbs, and that spread matters when you're thinking about what each additional property adds to your DTI. House medians in the more affordable Liverpool and Canterbury-Bankstown suburbs, like Liverpool at $1,300,000 with 12-month growth of 16.07%, or Edmondson Park at $1,339,000, sit below many other markets. That's relevant because a lower purchase price means a lower loan balance and a lower DTI hit per property, which is why the deposit suburbs often suit portfolio building more than the premium ones.

The $1,500,000 FHBG and FHG price cap covers houses in Bass Hill, Chester Hill, Liverpool, Edmondson Park, Moorebank, Wattle Grove, Villawood and Fairfield. Investors aren't eligible for those schemes, but the cap is useful as a reference line: if a suburb's median sits under $1,500,000, the borrowing required per property is lower and the DTI hit is proportionally smaller. Properties in Kingsgrove or Penshurst, both sitting around $1,930,000, require a materially larger loan and push the ratio higher with each purchase. Whether you're looking in Liverpool, Moorebank or Edmondson Park, the suburb you choose shapes how many properties your income can support.

Source: CoreLogic (via YIP, mid-2026) and Housing Australia.

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What government schemes can property investors use?

Most first-home buyer schemes, including the 5% Deposit Scheme and the Family Home Guarantee, aren't available to investors unless it's their first property purchase and they intend to live in it. Investors who are also first-time buyers need to be careful here: using the First Home Guarantee on a property you plan to rent out immediately would breach the occupancy conditions, and buying an investment before your own home means losing FHOG and FHBG eligibility entirely.

There are no state shared-equity schemes available in NSW at the moment. The federal Help to Buy scheme also requires the buyer to occupy the property as their principal place of residence, so it's not a pathway for a dedicated investment purchase. Where schemes genuinely do apply is for rentvesting, where the buyer purchases an investment property in an affordable suburb while continuing to rent where they want to live. That strategy has its own implications for FHOG and FHBG eligibility and is worth planning carefully with a broker before committing to a structure.

When does adding another investment loan stop making sense?

The case for a next property weakens when the marginal rental income from an additional purchase does very little to offset the serviceability cost of carrying it. A portfolio built on interest-only loans where every balance is sitting flat is a DTI problem waiting to arrive, because the ratio never improves between settlements. For an investor who's been adding properties on IO terms for several years, the ratio that looked comfortable at the start can look very different when the IO periods start rolling off and the repayments step up sharply.

It also stops making sense when the next purchase requires cross-collateralising multiple properties into one lender's facility. Simplifying the application looks appealing, but tying two or more securities together means selling one requires the lender's consent and a revaluation of the whole position. Most investors who've done this once wish they hadn't, and the broker's job at each purchase is to keep the loans separate and each property standing on its own equity. If the only way a purchase works is by pledging another property as additional security, that's usually a signal to wait rather than push.

How do you build a portfolio without running into the DTI wall?

The lender decision matters more with each property you add. Three policy differences move the portfolio ceiling for investors, and they're not visible on a rate comparison site.

• › ADI versus non-bank: banks and credit unions are subject to the APRA DTI cap; non-bank lenders are not, which means the same application declined at a bank in a full quarter can be approved at a specialist lender.
• › Rental income treatment: some lenders take 80% of gross rent; others take less, or apply a higher holding-cost deduction. That variance changes how much of your existing portfolio income counts toward the next assessment.
• › Investor quota timing: ADIs track owner-occupier and investor lending in separate pools, so a lender near its investor high-DTI quota may decline an investor while still approving an owner-occupier at the same ratio.

Matching the right lender to your current DTI position, and doing it before the application rather than after a decline sits on your credit file, is where comparing across a wide panel earns the most.

What goes wrong when investors try to scale in South West Sydney?

Common approval challenges for portfolio investors:

• › Credit card limits left open: unused credit card limits still count as fully drawn in the assessment, at roughly 3% to 3.8% of the limit per month. A $30,000 limit on a card you rarely use is still a commitment on your file, and it can make the difference on a third or fourth property.
• › Applying at the wrong lender at the wrong time: a decline sits on the credit file for five years. Investors who apply directly to their own bank, or at the lender with the most visible advertising, often use up the clean-file advantage on an application that had no realistic chance of approval that quarter.
• › Cross-collateralisation entered without a plan to exit: tying two properties under one facility makes the next purchase harder, because the lender controls both securities and any change requires a full revaluation. The cost of untangling it later, usually at refinance, is a fee and a delay that the cleaner structure at purchase would have avoided.
• › No plan for IO rollover: an interest-only period ending means the loan reverts to principal and interest over the remaining term, so repayments step up sharply. Investors who haven't planned for this across a portfolio of three or four loans can find the IO rollover moves all their remaining serviceability headroom at once.

Frequently Asked Questions

Is there a maximum number of investment properties lenders will finance?

There's no published property-count limit. What limits you is your debt-to-income ratio and whether a lender's high-DTI lending quota has capacity, so the practical ceiling differs between lenders and changes across the year.

Does the APRA DTI cap apply to all lenders?

No. The cap applies to authorised deposit-taking institutions only. Non-bank lenders aren't subject to it, which is why the same file can be approved at a non-bank when the banks are full for the quarter.

How does rental income from existing properties affect my borrowing capacity?

Most lenders count around 80% of gross rent from investment properties you already hold, then add holding costs as a separate commitment. The shade varies between lenders, so your assessed income from the portfolio is not the same at every bank.

Is it better to use interest-only or principal-and-interest loans across a portfolio?

Interest-only loans keep the balance flat, so the DTI stays elevated and doesn't improve between purchases. Principal-and-interest loans reduce the balance over time, which slowly improves the ratio and keeps more lenders available as the portfolio grows.

Can I use the First Home Guarantee to buy an investment property?

No. The First Home Guarantee requires the buyer to occupy the property as their principal place of residence. Using it on a property you plan to rent out immediately would breach the occupancy conditions and disqualify the application.

Should I use a mortgage broker or approach lenders directly to grow an investment portfolio?

A mortgage broker, every time. Each application leaves an enquiry on your credit file for five years, so applying at the wrong lender at the wrong time has a lasting cost. A broker checks which lenders have investor DTI capacity before an application is lodged.

Your Next Steps

Growing an investment portfolio in South West Sydney, NSW depends less on the number of properties than on how the debt is structured at each step. The DTI cap, rental income shading and lender quota timing all interact differently at two, three and four properties, and the lender that worked well the first time isn't always the right one for the next purchase.

Ready to find out which lenders will work best for your investment portfolio? Contact the Infinity Mortgage Brokers team or call 0426 955 190. We'll canvas our 40+ lender panel and find the most suitable options for your circumstances.

About the author Dimitri Giannopoulos Director, Infinity Mortgage Brokers Dimitri Giannopoulos is the Director at Infinity Mortgage Brokers, a Bankstown-based brokerage serving South West Sydney since 2017. He helps first home buyers, upgraders and investors across Bankstown and the wider South West Sydney region. A member of the Finance Brokers Association of Australia (FBAA) and a Justice of the Peace, Dimitri operates as an Authorised Credit Representative (488432) of Connective Credit Services Pty Ltd (Australian Credit Licence 389328), comparing loans across a panel of 40+ lenders at no cost to the borrower. Meet Dimitri → Book a call →

Infinity Mortgage Brokers, Bankstown and South West Sydney. This website is general information only and does not constitute financial advice. Please consider your own circumstances and seek professional advice before making any financial decisions.