Borrowing Power For A $3–5 Million Home: The Numbers That Matter

Buying a $3–5 million home in Australia puts you into a very different lending world.

For this price range, banks usually want higher incomes, more equity and stronger buffers than for a standard mortgage. In simple terms: to safely borrow in the $2–4 million loan range, most households need $350k–$800k+ after‑tax income, low other debts, and 6–12 months of stressed repayments in cash or offset. The exact number depends on your income type, living costs, age and loan structure.

This guide gives you decision‑grade numbers so you can set a clear price range and action plan this week.

Buying in the $3–5 million range pushes you into different lending rules.

1. What actually drives your borrowing power for a $3–5 million home?

For large loans, lenders use the same basic rules as for smaller ones, but apply them much more conservatively.

1.1 The core ingredients

Banks start with five main inputs:

1. Income – salary, bonuses, business profits, rental income.
2. Debts – existing home and investment loans, credit cards, leases.
3. Living costs – your declared costs or the Household Expenditure Measure (HEM), whichever is higher.
4. Interest rate + APRA buffer – they test at ~3% above the actual rate (APRA guidance).
5. Loan term & structure – P&I vs IO, 25 vs 30 years, etc.

From there, they work out a maximum repayment they’re comfortable with and turn that into a maximum loan size. For large loans, that number is also capped by internal jumbo limits and LVR caps (see below).

1.2 Why high‑value loans feel tighter

Above ~$2 million of exposure, many lenders:

• Shade bonuses and variable income harder.
• Cap LVRs (for example, max 70–80% on a prestige home, sometimes lower for investors).
• Use slightly tougher living‑cost assumptions.
• Want stronger evidence of ongoing income and buffers.

If you’re buying in Sydney’s East or similar markets, those rules can cut your limit well below what online calculators show. That’s why broker‑grade servicing beats generic tools, especially for big loans (see /insights/inside-lender-serviceability-calculators-broker-vs-online-tools).

1.3 Your safe limit vs the bank’s limit

Just because a bank will lend you $3.5 million doesn’t mean you should take it.

Across our work with high‑income households, a practical speed limit is:

• Keep total home and investment loan repayments ≤30–35% of after‑tax income, and
• Hold 6–12 months of stressed repayments plus essential living costs as a buffer.

This aligns with the guardrails in our guide on safe multi‑million‑dollar home loans.

2. How much income do you need for a $3–5 million home?

The answer depends on your deposit/LVR and whether you’re buying as an owner‑occupier or investor.

Below are indicative ranges assuming mainstream lenders, no major credit issues, and principal & interest (P&I) repayments.

Illustrative rate assumption: 6.5% p.a. actual rate, tested at 9.5% p.a. with the APRA 3% buffer. 30‑year P&I term. These are examples only, not quotes.

2.1 Worked example – $3 million purchase

Let’s compare two households buying a $3m home.

Scenario A – High deposit, lower loan

• Purchase price: $3,000,000
• Deposit / equity: $1,200,000 (40%)
• Loan: $1,800,000 (60% LVR)

Approximate repayments at 6.5% over 30 years:

• Monthly: ~$11,380
• Annual: ~$136,600

Using a 30–35% of after‑tax income rule for safety:

• Required net income ≈ $390k–$455k p.a.
• Rough gross income (assuming 40–45% tax, Medicare, etc.): $650k–$800k+ household income.

Banks may be willing with less income if you have extremely low living costs, but you’d be running with minimal buffer.

Scenario B – Smaller deposit, large loan

• Purchase price: $3,000,000
• Deposit / equity: $600,000 (20%)
• Loan: $2,400,000 (80% LVR)

Repayments at 6.5%:

• Monthly: ~$15,170
• Annual: ~$182,000

Safe repayment band (30–35% of net income):

• Required net income ≈ $520k–$610k
• Rough gross income: $850k–$1.1m household income.

At this price level, extra deposit dramatically lowers the income you need.

2.2 Worked example – $5 million purchase

Now shift to a $5m home.

Scenario C – Strong equity, conservative LVR

• Purchase price: $5,000,000
• Deposit / equity: $2,500,000 (50%)
• Loan: $2,500,000 (50% LVR)

Repayments at 6.5%:

• Monthly: ~$15,820
• Annual: ~$189,800

Safe net income band (30–35%):

• $540k–$630k net, which might mean ~$900k–$1.2m+ gross.

Scenario D – Aggressive gearing

• Purchase price: $5,000,000
• Deposit / equity: $1,000,000 (20%)
• Loan: $4,000,000 (80% LVR)

Repayments at 6.5%:

• Monthly: ~$25,290
• Annual: ~$303,500

Safe net income band (30–35%):

• $870k–$1.01m net, which may mean $1.4m+ gross income.

Many banks will hesitate at this leverage unless you’re an ultra‑high‑income professional with strong liquidity and low other debts.

3. How banks test your borrowing power on large loans

Lender calculators are complex, but you can understand the main levers.

3.1 The APRA buffer and assessment rate

APRA expects banks to test your loan at at least 3 percentage points above the actual rate.

So if your offer rate is 6.5%, lenders may test at 9.5% or higher. For a multi‑million‑dollar loan, this is huge.

• A $3m loan at 6.5%: ~$18,920/month interest only.
• Stressed at 9.5%: ~$23,750/month interest only.

On P&I, the gap is similar. This stress test is the key reason your online calculator limit and bank limit don’t match, particularly at the top end.

3.2 HEM living costs and why big incomes still hit a wall

Australian lenders use HEM (Household Expenditure Measure) as a minimum spending benchmark. For high‑income families, HEM can be surprisingly high. If your declared living costs are lower than HEM, they’ll usually use HEM instead.

With large loans, HEM can easily add the equivalent of several hundred thousand dollars of income to what the bank thinks you "need" to live. That’s one reason why high‑income buyers often feel their borrowing power is lower than it "should" be.

For a deeper look at how HEM and buffers affect prestige‑market buyers, see our guide on real borrowing power in Sydney’s Eastern Suburbs.

3.3 Income shading – salary vs bonuses vs business profits

For large loans, banks often:

• Take 100% of base salary (if stable).
• Take 60–80% of bonuses/commissions/RSUs, averaged over 2–3 years.
• For the self‑employed, use the lower of the last two years’ taxable income, sometimes adding back non‑cash items.

If you’re a partner, principal, or business owner, your accountant’s tax strategy can heavily affect borrowing power. Aggressive income deferral may save tax but slash your serviceability right when you want to upgrade. Coordinating tax and borrowing decisions is critical.

3.4 Other debts and limits

Before signing anything, expect the bank to:

• Apply buffered repayments to all existing loans.
• Assume 3% of total credit card limits as monthly repayments, whether you clear them or not.
• Price car leases and "buy now, pay later" facilities as ongoing debts.

At the $3–5m range, clearing or reducing these can move your limit by hundreds of thousands of dollars.