How to Use Rental Income from an Australian Investment Property to Boost Your Loan Borrowing Power

Investing in Australian real estate is a popular wealth-building strategy, but many investors overlook a critical aspect: how rental income can significantly enhance their borrowing capacity. Whether you’re a first-time investor or expanding your portfolio, understanding how lenders assess rental income can unlock greater loan amounts and better terms. This comprehensive guide explores the mechanics of rental income assessment, the percentages lenders use, and actionable strategies to maximise your borrowing power.

Understanding Borrowing Power and Rental Income

Borrowing power, also known as borrowing capacity, is the maximum amount a lender is willing to loan you based on your financial situation. It considers your income, expenses, existing debts, and the lender’s assessment rate. For property investors, rental income from the investment property is a key factor that can tip the scales in your favour.

Lenders view rental income as a way to offset the mortgage repayments on the investment property, effectively reducing the debt burden in their calculations. However, they don’t take the full rental amount at face value. Instead, they apply a discount to account for vacancies, property management fees, maintenance, and other holding costs. This conservative approach ensures borrowers can still meet repayments even during periods of reduced rental income.

Why Lenders Discount Rental Income

Lenders are risk-averse. A property might achieve $500 per week in rent, but that’s not guaranteed. Tenants can default, properties can sit vacant between leases, and unexpected repairs can eat into cash flow. By applying a haircut—typically 20% to 30%—lenders build a buffer. This means if your property earns $2,000 a month, the lender might only count $1,400 to $1,600 toward your income assessment.

Understanding this discount is crucial because it directly impacts how much you can borrow. A higher rental yield can boost your borrowing power, but only if you know how to present it effectively.

How Lenders Assess Rental Income

Lenders use different methods to calculate the rental income they’ll consider. The most common approaches include:

• Actual rental income: For existing investment properties with a rental history, lenders typically use the income shown on your tax return or a current lease agreement. They may average the income over the past year or use the current rent.
• Market rental appraisal: For new purchases or properties without a rental history, lenders rely on an independent market rental appraisal from a licensed real estate agent or a valuer’s estimate. This appraisal estimates the property’s potential weekly rent.
• Lender’s internal benchmarks: Some lenders use their own conservative estimates based on the property’s location and type, especially for unique properties where comparable data is scarce.

The Percentage Lenders Use

In Australia, most lenders apply a “rental income shading” factor. The exact percentage varies by lender, but the industry standard is to consider between 70% and 80% of the gross rental income. For example:

• Big four banks: Typically use 75% to 80% of the rental income.
• Non-bank lenders: May use up to 80% or even 90% in some cases, but often with higher interest rates.
• Specialised investment lenders: Sometimes offer more generous assessments for strong applications.

Let’s illustrate with a table:

Note: Specialist lenders that accept 100% of rental income are rare and usually require a strong overall profile, such as a high credit score or significant equity.

Assessment Rates and Buffers

Beyond the income shading, lenders apply a “serviceability assessment rate” to your total debts. This is an interest rate higher than the actual loan rate to test if you can afford repayments if rates rise. The Australian Prudential Regulation Authority (APRA) previously mandated a buffer of 3% over the loan’s interest rate, but this was removed in 2019. However, lenders still use their own buffers, typically between 2.5% and 3.0%.

For example, if your loan rate is 6%, the lender might assess your ability to repay at 9%. This means even if rental income covers the actual mortgage payment, the higher assessment rate could reduce its impact on borrowing power.

Strategies to Maximise Your Borrowing Capacity Using Rental Income

Now that you understand the mechanics, let’s explore practical strategies to make your rental income work harder for you.

1. Choose High-Yield Properties

The most straightforward way to boost borrowing power is to invest in properties with strong rental yields. Yield is the annual rental income divided by the property value. For instance, a $500,000 property renting for $500 per week ($26,000 per year) has a 5.2% gross yield. Higher yields mean more income to offset the loan, which lenders view favourably.

Focus on areas with robust rental demand, such as near universities, hospitals, or major employment hubs. Regional areas often offer higher yields than capital cities, but be mindful of growth prospects and vacancy rates.

2. Obtain a Professional Rental Appraisal

When purchasing a new investment property, don’t rely on the selling agent’s optimistic estimate. Commission an independent rental appraisal from a licensed property manager. Provide this to your lender or mortgage broker to support your application. A well-documented appraisal with comparable evidence can justify a higher rental figure, increasing the income the lender considers.

3. Fix Up and Increase Rent

If you already own an investment property, consider making value-adding improvements that justify a rent increase. Simple upgrades like fresh paint, new flooring, or modern appliances can boost rental income. After the increase, provide your lender with the new lease agreement to update your income assessment. This can directly enhance your borrowing power for future loans.

4. Minimise Vacancy and Arrears

Lenders scrutinise rental consistency. A property with a history of long vacancies or tenant defaults will raise red flags. Maintain your property well, screen tenants thoroughly, and consider professional property management to ensure steady income. Some lenders may ask for rental ledgers or tax returns showing consistent income over time.

5. Reduce Holding Costs

Lenders subtract investment property expenses from your income when calculating borrowing power. These include:

• Property management fees (typically 5% to 10% of rent)
• Council rates
• Insurance
• Maintenance and repairs
• Strata fees (for apartments)

By keeping these costs low, you improve your net rental income, which lenders view more positively. Shop around for competitive insurance and property management rates, and consider self-managing if you’re experienced (though this may not suit everyone).

6. Use a Mortgage Broker

Different lenders have varying policies on rental income. A mortgage broker can compare lenders to find one that offers the most favourable treatment of your rental income. For example, some lenders may use 80% of rental income for apartments but only 70% for houses in certain postcodes. A broker can also help structure your loans to maximise tax benefits and borrowing power.

7. Consider Rental Income from Granny Flats or Dual Occupancies

Properties with multiple income streams, such as a house with a granny flat or a duplex, can supercharge your borrowing power. Lenders may assess each rental stream separately, often applying the same shading factor to each. This can significantly increase the total income counted, provided the setups are legal and documented.

8. Leverage Tax Benefits

While lenders don’t directly consider tax benefits like negative gearing in their serviceability calculations, they do look at your after-tax income. Rental property deductions such as depreciation, interest on the loan, and property expenses can reduce your taxable income, increasing your take-home pay. This higher net income improves your overall borrowing power. Ensure your tax returns reflect these benefits accurately.

9. Pay Down Existing Debts

Your borrowing power is a function of your income versus your liabilities. By reducing credit card limits, personal loans, or car loans, you free up more capacity for the investment loan. Even if rental income is strong, high existing debt can negate its benefits.

10. Time Your Application Strategically

If you’re planning to buy another property, consider the timing of your rental income evidence. A newly signed lease at a higher rent can be used immediately, whereas tax return data might reflect lower rents from the previous year. Present the most up-to-date and favourable income picture possible.

Common Pitfalls to Avoid

While rental income can boost borrowing power, missteps can backfire. Avoid these common mistakes:

• Overestimating rental income: Lenders will verify your claims. Providing inflated figures can lead to application rejection or even accusations of fraud.
• Ignoring lender-specific policies: Some lenders treat short-term rental income (e.g., Airbnb) differently, often requiring a history of consistent earnings or applying higher shading factors.
• Forgetting about taxes: Rental income is taxable. While lenders focus on gross rental income for serviceability, your overall tax position affects your net income. Consult a tax professional to optimise your situation.
• Neglecting property condition: A poorly maintained property may achieve lower rents and higher vacancies, undermining your borrowing power over time.

The Role of LVR and Equity

Rental income is just one piece of the puzzle. Your Loan-to-Value Ratio (LVR) and equity also influence borrowing power. A lower LVR (e.g., 70% instead of 80%) reduces the lender’s risk, which can sometimes lead to more favourable rental income treatment or higher borrowing limits. Building equity through capital growth and paying down principal can open doors to further investment.

Real-World Example: How Rental Income Boosts Borrowing Power

Let’s walk through a scenario. Assume you earn $100,000 per year, have no other debts, and want to buy a $600,000 investment property with a 20% deposit ($120,000). The property rents for $550 per week.

• Without rental income: Using a lender’s calculator with a 9% assessment rate, your borrowing power might be around $450,000 based solely on your salary. You’d fall short of the $480,000 loan needed.
• With rental income (75% shading): The lender counts $550 * 0.75 = $412.50 per week, or $21,450 per year. This additional income, even after deducting holding costs, could increase your borrowing power to over $550,000, making the purchase feasible.

This simple example shows how rental income can bridge the gap between what you can afford and the property you want.

FAQ

Q1: Do all lenders use the same percentage for rental income?

No, rental income shading varies by lender. Major banks typically use 75% to 80%, while non-banks may go up to 90%. It’s essential to compare policies or work with a broker to find the most favourable option.

Q2: Can I use projected rental income for a property I haven’t bought yet?

Yes, lenders accept a market rental appraisal from a licensed agent or valuer for new purchases. This estimated rent is then shaded according to the lender’s policy. Ensure the appraisal is realistic and supported by comparable properties.

Q3: How does negative gearing affect my borrowing power?

Negative gearing itself doesn’t directly increase borrowing power, but the tax deductions from investment property expenses (including interest) can reduce your taxable income, increasing your after-tax income. Lenders assess your net income, so effective tax planning can indirectly boost your capacity.

Q4: What if my rental income is inconsistent?

Lenders prefer stable rental histories. If you have gaps, be prepared to explain them. Some lenders may average income over two years, while others might use only the most recent lease. Short-term rental income (e.g., Airbnb) is often treated more conservatively, with some lenders requiring a 12-month history or applying a higher shading factor.

References

• Australian Securities and Investments Commission (ASIC) – MoneySmart: Rental property investment
• Australian Taxation Office (ATO) – Investment property deductions
• Australian Bureau of Statistics (ABS) – Residential Property Price Indexes

Note: This article provides general information and does not constitute financial advice. Consult a qualified mortgage broker or financial advisor for personalised guidance.