How Much Can I Borrow for Investment Property?

If you're wondering how much can i borrow for investment property, the answer is almost always less than an owner-occupier home loan — and most investors don't realise this until they're deep into the pre approval process.

Banks assess your borrowing capacity differently for an investment home loan. They apply a higher interest rate buffer, discount the rental income you'll receive, and add fees and charges that don't apply to a standard home loan application. Your credit history, financial situation, and existing mortgage repayments all affect the outcome.

This guide covers how banks calculate your borrowing power for a home loan on an investment property, strategies to increase the maximum amount you're able to borrow based on your circumstances, and how to model your numbers using our investment property loan calculator.

How Banks Calculate Your Home Loan Borrowing Power

Every financial institution uses a slightly different model, but the core formula for your home loan borrowing capacity works like this:

Borrowing power = (Assessed income − Living expenses − Financial commitments) ÷ Assessment rate repayments

Let's break down each component.

Assessed Income

Lenders count your net income differently depending on the source:

Income Source	How Lenders Assess It
PAYG salary	100% of gross (before tax)
Rental income from existing properties	70-80% of gross rent
Expected rental income (new property)	70-80% of market estimate
Self-employed income	Average of last 2 years
Overtime / bonuses	80% (if consistent 2+ years)

The key difference for an investment home loan: lenders do not count 100% of your projected rental income. They typically consider 70-80% of projected rent to account for vacancy periods and maintenance costs — this is known as the rental income 'shading' factor. On a security property earning $600/week, the home loan assessment may only count $420-$480 toward your annual income. A credit score of 700 or above is often preferred for investment loans to secure favourable home loan interest rates and terms.

Living Expenses

Lenders use the higher of: - Your declared living expenses, or - The Household Expenditure Measure (HEM) benchmark for your financial situation

For a single person, HEM sits around $25,000-$30,000 per year. For a couple with two children, it's $45,000-$55,000. Your actual expenses (car loan repayments, credit card limits, HECS debt, other financial commitments) are added on top. Moneysmart has a good overview of how lenders assess expenses.

The Interest Rate Buffer

This is where home loan borrowing capacity drops significantly for investors. The APRA macroprudential framework requires banks to assess whether you can pay interest and principal repayments at the current interest rate PLUS a buffer — typically 3 percentage points set by the Reserve Bank of Australia.

If today's investment loan interest rate is 6.49%, the lender calculates whether you can afford principal and interest repayments at 9.49%.

On a $500,000 loan: - Actual monthly repayment at 6.49% P&I: $3,159 - Assessment repayment at 9.49% P&I: $4,210

The bank needs to see that your income covers the higher repayment amount — even though you'll never actually pay it.

Borrowing Power Calculator: Worked Examples

Here's how much you could borrow for an investment property home loan at different income levels (assuming the property generates $550/week rent, home loan comparison rate of 6.69%, 30-year loan term, and no other existing home loan debt). These examples use the same frequency of assessment that most banks apply to home loan applications.

Example 1: Single Income $110,000

Factor	Amount
Gross annual income	$110,000
Rental income (at 80%)	$22,880
Living expenses + commitments	$32,000
Assessed net income for lending	$100,880
Estimated borrowing power	$560,000 – $620,000
Monthly repayments (actual, 6.49%)	$3,538 – $3,917

Example 2: Couple Combined Income $180,000

Factor	Amount
Combined gross income	$180,000
Rental income (at 80%)	$22,880
Living expenses + commitments	$52,000
Assessed net income for lending	$150,880
Estimated borrowing power	$780,000 – $850,000
Monthly repayments (actual, 6.49%)	$4,926 – $5,368

Example 3: Already Have an Existing Home Loan ($400,000)

Factor	Amount
Gross annual income	$130,000
Rental income (at 80%)	$22,880
Existing home loan repayments (assessed at buffer)	$38,520
Living expenses + other commitments	$35,000
Estimated borrowing power (second loan)	$380,000 – $440,000
Monthly repayments (actual, 6.49%)	$2,400 – $2,779

Your existing home loan repayments are assessed at the buffer rate — not your actual repayment amount. This is why borrowing capacity drops significantly for a second or third investment property.

Use our mortgage repayment calculator to model your exact financial situation with current home loan interest rates. Keep in mind that calculations from borrowing power calculators are estimates and do not constitute a loan approval — they are based on the information you provide. The accuracy of the borrowing power estimate is influenced by the details entered, such as income, expenses, and existing financial commitments.

7 Ways to Increase How Much You Can Borrow

If the numbers from a borrowing power calculator aren't where you need them, here are proven strategies to boost your loan amount:

1. Reduce Your Financial Commitments

Close unused credit cards (lenders assess the full limit, not your balance). Pay down your car loan. Every $10,000 in reduced financial commitments can add $50,000-$80,000 to your borrowing capacity.

2. Switch to Interest Only on Existing Investment Loans

Interest only repayments on existing investment loans reduce the monthly repayment amount assessed — freeing up borrowing power for a new loan.

3. Extend Your Home Loan Term

A longer loan term (30 years vs 25) reduces the assessed home loan repayments. Even if you plan to make unlimited extra repayments to reduce interest over time, the lower minimum repayments increase how much you're able to borrow.

4. Use an Offset Account Strategically

Funds in an offset account reduce your loan balance for interest calculation purposes. This reduces interest payable and improves your complete financial position — which lenders view favourably.

5. Choose a Lender with a Lower Interest Rate Buffer

Some non-bank home loan providers assess at a 2-2.5% buffer instead of 3%, increasing how much you're able to borrow by 10-15%. Different eligibility criteria apply, the comparison rate may be higher, and there may be a non refundable annual fee.

6. Increase Rental Income Before Applying

Increase below-market rent before your loan application. Every $50/week increase adds ~$2,080 to assessed annual income (at 80%), supporting an additional $20,000-$30,000 in borrowing.

7. Get Pre Approval Before House Hunting

A conditional approval (pre approval) from your home loan provider confirms your maximum amount for a set period — typically 90 days. It doesn't commit you to a fixed rate home loan or specific loan types.

Investment Property Loan vs Home Loan: Key Differences

Factor	Home Loan	Investment Loan
Interest rate	~6.19%	~6.49% (higher)
Rental income counted	N/A	70-80% of gross rent
Lenders mortgage insurance	80-90% LVR	80% LVR (stricter)
Interest deductibility	Not deductible	Fully deductible
Stamp duty	First home buyer exemptions	No exemptions
Repayment types	P&I or IO	P&I or IO (IO limited to 5 years)
Loan purpose assessment	Standard	Additional cash flow scrutiny

The interest rate premium of 0.3-0.5% on an investment loan compounds through the buffer, reducing your borrowing capacity by approximately $15,000-$25,000.

What Property Value Can Your Borrowing Power Actually Buy?

Remember: your loan amount isn't your purchase budget. Lenders usually require a deposit of 5-20% for investment properties, and they often cap loans at an 80% loan to value ratio (LVR). You also need to account for upfront costs.

On a $650,000 property in Brisbane:

Cost	Amount
Property value	$650,000
Stamp duty (QLD investor)	$17,325
Legal/conveyancing	$2,000
Building & pest inspection	$800
Home loan fees and charges	$600
Total funds required	$670,725
Deposit (20% to avoid lenders mortgage insurance)	$130,000
Loan amount needed	$540,725

Our stamp duty calculator shows the exact stamp duty fees and charges for each state — the loan to value ratio and total home loan costs vary significantly between NSW, VIC, and QLD.

How to Calculate Your Home Loan Repayments

Once you know your borrowing power, model actual home loan repayments with our loan repayment calculator:

1. Enter your home loan amount and loan term (25 or 30 years)
2. Set the current home loan interest rate and repayment frequency
3. Compare interest only vs principal and interest repayments
4. Factor in extra repayments or offset account savings

The calculator shows total home loan repayments, how much you pay in interest, and how extra repayments reduce your loan balance over time.

Economic Conditions Affecting Borrowing Power in 2026

Key factors influencing how much you can borrow right now:

• Reserve Bank cash rate: At 3.85% (April 2026), with cuts expected — each 0.25% reduction adds ~$15,000-$20,000 to borrowing capacity
• Credit policy: Some lenders now assess rental income at 70% instead of 80%, reducing borrowing power in tighter economic conditions
• Cost of living: Higher HEM benchmarks reduce net income in lending assessments

Next Steps: Check Your Borrowing Power

1. Use our calculator — Run your numbers through the PropBoss investment property loan calculator to estimate loan repayments at different borrow amounts
2. Talk to a broker — A mortgage broker (Australian credit licence holder) can assess your complete financial position across multiple lenders at your nearest branch or financial institution
3. Get pre approval — Lock in your maximum amount before you start your home buying journey into investment property

Use our rental yield calculator to check whether the property you can afford will generate positive cash flow — being able to borrow doesn't mean you should.