Why Smart Investors Use Different Lenders Across Their Portfolio

Most geared investors are safer using different lenders across their portfolio, rather than stacking every loan with one bank. Spreading loans and securities helps protect borrowing power, reduce the risk of being “hostage” to one credit policy, and makes it far easier to sell, refinance or regear individual properties later.

In the current environment of tighter investor tax settings and APRA’s 3% serviceability buffer, lender diversification is now a core portfolio risk tool, not a nice-to-have.

Using different banks for each property can reduce risk and protect borrowing power.

Why spreading loans across lenders protects your borrowing power

1. Serviceability rules differ more than you think

Each bank applies its own flavour of the APRA rules. They all:

• Stress-test repayments at ~3% above your rate (APRA buffer).
• Apply Household Expenditure Measure (HEM) benchmarks.
• Shade rental income (often 70–80% usable).

But there are key differences:

• Some accept higher proportions of bonus/commission or self-employed income.
• Some are harsher on existing investment debt or short-stay income.
• Some load higher “assessment rates” on interest-only loans.

Using multiple lenders lets you match each property or purchase to the lender whose policy best fits that specific deal.

2. One bank can quietly cap your future plans

If all your loans sit with one big four bank and they tighten policy, your entire portfolio’s borrowing power can fall overnight.

You might:

• Fail serviceability for your next purchase even though your cashflow is fine.
• Be unable to refinance an underperforming loan.
• Be forced onto less competitive pricing because you can’t move.

With two or three lenders, a “no” from one doesn’t end the conversation. As outlined in /insights/bank-said-no-investment-refinance-what-to-do, a decline from one bank is often a signal to restructure, not to stop.

Multiple lenders vs one bank: what actually changes?

Comparison: single-lender vs multi-lender portfolio

For most geared investors, the extra admin is a small price for structural protection.

How to decide which loan goes to which lender

1. Anchor your home, diversify your investments

A common approach:

• Family home: with a mainstream “anchor” lender offering sharp owner-occupier rates and good offset functionality.
• First couple of investments: with different lenders, each secured only by the specific investment property where possible.

Keeping one primary loan per property with minimal cross-collateralisation is critical, as we’ve covered elsewhere: it lets you sell or refinance a single property without unravelling everything.

2. Use purpose-based loan splits at each lender

Even when using multiple lenders, you still need clear, purpose-based splits:

• Home
• Investment
• Business

Australian tax deductibility follows the purpose of the borrowed funds, not the security property. Clean splits, as discussed in several of our guides, make it far simpler to refinance or move a single split to another lender later without contaminating tax outcomes.

3. Play to each lender’s strengths

Examples:

• Lender A: sharper on owner-occupier P&I, conservative on rent.
• Lender B: more generous with rent, but higher investment rates.
• Lender C: flexible with self-employed income or complex trusts.

You might:

• Keep your PPOR and its offset with Lender A.
• Park a high-yield regional investment with Lender B.
• Place a mixed-use or short-stay property with Lender C, after checking local land tax and short-stay rules as outlined in /insights/land-tax-investment-short-stay-rules-finance-impacts-states.