How to Use Australian Rental Income to Boost Your Home Loan Borrowing Power in 2025


In Australia’s dynamic property market, rental income has become a powerful lever for investors seeking to maximize their home loan borrowing capacity. As we navigate 2025, understanding how lenders assess rental income can mean the difference between securing your next investment property and falling short of your financial goals. This comprehensive guide will walk you through the practical steps, lender policies, tax considerations, and calculation methods to effectively use rental income to boost your borrowing power.

Understanding Rental Income in the Eyes of Australian Lenders

When you apply for a home loan, lenders don’t simply take your gross rental income at face value. They apply specific policies and calculations to determine how much of that income can be used to service a new loan. This process is crucial because it directly impacts your borrowing power—the maximum amount a lender is willing to lend you based on your income, expenses, and existing debts.

What Counts as Rental Income?

Rental income includes all payments received from tenants for the use of your property. This typically covers:

• Regular rent payments
• Payments for additional services (e.g., parking, storage)
• Rent from short-term or holiday letting (subject to specific lender policies)
• Boarding or lodging income (treated differently by some lenders)

Lenders will also consider prospective rental income if you’re purchasing a new investment property. In such cases, they rely on a rental appraisal from a licensed real estate agent or a valuer’s estimate.

Lender Assessment Methods: The Shift in 2025

In 2025, Australian lenders continue to refine their assessment methods to balance responsible lending with investor needs. The two primary approaches are:

1. Inclusion of Net Rental Income in Serviceability Calculations: Most lenders add a portion of your net rental income (gross rent minus expenses) to your assessable income after applying a “shading” factor.
2. Deducting Investment Property Expenses from Total Income: Some lenders deduct the full cost of investment property ownership (including mortgage repayments) from your overall income before calculating borrowing capacity.

The method used can significantly affect your borrowing power. For instance, lenders using the net rental income approach may allow you to borrow more if your property is positively geared.

How Lenders Calculate Rental Income for Serviceability

Lenders use a serviceability model to determine if you can afford the loan repayments. Rental income is integrated into this model, but not without adjustments.

The Shading Factor

Most lenders apply a “shading” or “haircut” to gross rental income to account for vacancies, maintenance, and other holding costs. In 2025, common shading factors range from 20% to 25%. For example, if your property generates $30,000 in gross annual rent, a lender applying a 20% shade would only consider $24,000 as assessable income.

Some lenders have moved to more nuanced models that consider the property’s location, type, and rental market conditions. For instance, properties in high-demand areas with low vacancy rates may receive a lower shading factor.

Negative Gearing and Borrowing Power

Negative gearing occurs when the expenses of owning an investment property (including mortgage interest, maintenance, and depreciation) exceed the rental income. While negative gearing can provide tax benefits, it can reduce your borrowing power because lenders view the net loss as a drain on your cash flow.

Lenders handle negative gearing in two ways:

• Adding the net loss to your expenses: This directly reduces your surplus income available for loan repayments.
• Using the net rental income (or loss) in the serviceability calculation: If the property is negatively geared, the shortfall is deducted from your assessable income.

In 2025, some lenders have introduced buffers to account for potential interest rate rises on investment loans, which can further impact borrowing capacity for negatively geared properties.

Positive Gearing: A Boost to Borrowing Power

Positively geared properties, where rental income exceeds all expenses, are a boon for borrowing power. The surplus income increases your assessable income, allowing you to service a larger loan. However, lenders still apply shading to the gross rent, so the full surplus isn’t always captured.

Tax Considerations and Their Impact on Loan Applications

Taxation plays a dual role in property investment: it affects your cash flow and how lenders assess your income.

Rental Income and Taxable Income

For tax purposes, rental income must be declared in your annual tax return. You can claim deductions for related expenses, including:

• Mortgage interest
• Property management fees
• Repairs and maintenance
• Council rates
• Depreciation (capital works and plant and equipment)

These deductions reduce your taxable rental income, potentially creating a net loss for tax purposes. However, lenders often “add back” certain non-cash deductions like depreciation when assessing your borrowing capacity. This is because depreciation doesn’t represent an actual cash outflow.

How Lenders View Tax Deductions

Lenders typically request your latest tax returns and notices of assessment. They will scrutinize:

• The net rental income (or loss) reported to the ATO
• Any add-backs for depreciation and other non-cash expenses
• The consistency of rental income over time

Some lenders use a standardized add-back rate for depreciation, while others rely on the figures in your tax return. In 2025, with changes to depreciation rules for second-hand assets, it’s essential to provide accurate schedules from a qualified quantity surveyor.

The Role of Depreciation in Serviceability

Depreciation can be a double-edged sword. While it reduces your taxable income (saving you tax), it can also lower the net rental income that lenders use for serviceability. However, as mentioned, many lenders add back depreciation to your income, recognizing it’s a non-cash expense. This is why providing a detailed depreciation schedule with your loan application is crucial.

Practical Steps to Maximize Borrowing Power Using Rental Income

Now that you understand the theory, let’s explore actionable steps to leverage rental income for a higher loan approval.

1. Choose the Right Lender

Not all lenders are created equal. Some are more generous in their treatment of rental income. Key factors to compare include:

• Shading percentage applied
• Acceptance of short-term rental income (e.g., Airbnb)
• Treatment of negative gearing losses
• Add-back policies for depreciation

Working with a mortgage broker who understands investor lending can help you identify lenders with policies that favor your situation.

2. Optimize Your Property’s Rental Yield

A higher rental yield means more assessable income. Consider:

• Renovations that attract higher rent: A modern kitchen or bathroom can significantly increase rent.
• Adding extra bedrooms or living spaces: More space often commands higher rent.
• Furnishing the property: Furnished properties can yield higher weekly rents, though they may attract shorter tenancies.

Always weigh the cost of improvements against the expected rental increase.

3. Maintain Impeccable Rental Records

Lenders want evidence of consistent rental income. Ensure you have:

• Signed lease agreements
• Bank statements showing regular rent deposits
• Rental statements from your property manager
• Tax returns with rental schedules

For new purchases, a professional rental appraisal from a licensed agent is essential. Some lenders may also accept a letter from the selling agent or a valuer’s estimate.

4. Reduce Vacancy Rates

High vacancy rates can lead lenders to apply a higher shading factor or question the reliability of your rental income. Strategies to minimize vacancies include:

• Pricing rent competitively
• Maintaining the property in good condition
• Offering longer lease terms
• Using a proactive property manager

5. Consider the Impact of Interest Rates

In 2025, interest rates remain a focal point. Lenders assess serviceability at a higher “assessment rate” (usually 2-3% above the actual loan rate) to ensure you can handle future rises. A positively geared property can help offset this buffer, while a negatively geared one may strain your borrowing capacity.

Lender Policies in 2025: A Comparative Snapshot

Lender policies on rental income can vary significantly. Here’s a general overview of how different types of lenders approach rental income in 2025:

Note: Policies are subject to change. Always verify with the lender or your broker.

Short-Term Rental Income (Airbnb, Stayz)

The rise of platforms like Airbnb has led more investors to explore short-term letting. However, lenders remain cautious due to income volatility. In 2025:

• Most major banks require a 12-month history of short-term rental income before considering it.
• Some non-bank lenders accept projected income based on comparable properties.
• You may need to provide booking records, tax returns, and a letter from the platform.

If you rely on short-term rental income, seek lenders with explicit policies in this area.

Case Study: Boosting Borrowing Power with Rental Income

Let’s consider a practical example. Sarah owns an investment property valued at $600,000 with a $400,000 mortgage. The property generates $28,000 in annual rent. Her expenses (excluding mortgage principal) total $20,000, including interest, rates, and management fees. She earns a salary of $90,000 and wants to buy another investment property.

Scenario A: Lender with 20% Shading and Negative Gearing Add-Back

• Gross rent: $28,000
• Shaded rent (80%): $22,400
• Net rental income: $22,400 - $20,000 = $2,400 (positive)
• Assessable income: $90,000 + $2,400 = $92,400

Scenario B: Lender with 25% Shading and No Depreciation Add-Back

• Gross rent: $28,000
• Shaded rent (75%): $21,000
• Net rental loss: $21,000 - $20,000 = $1,000 (negative)
• Assessable income: $90,000 - $1,000 = $89,000

In Scenario A, Sarah’s borrowing capacity is higher because the lender’s policy results in a positive contribution from the rental property. This illustrates how lender choice can make a significant difference.

Common Mistakes to Avoid

When using rental income to boost borrowing power, steer clear of these pitfalls:

• Overstating Rental Income: Lenders will verify your claims. Exaggerating rent can lead to loan rejection.
• Ignoring Holding Costs: Even positively geared properties have expenses. Ensure you account for all costs in your budget.
• Relying Solely on Tax Returns: Tax returns show historical data. Lenders also consider current and prospective income.
• Not Disclosing All Investment Debts: All loans and liabilities must be declared, as they affect serviceability.

The Future of Rental Income Assessment

Looking ahead, we expect lenders to increasingly use data-driven approaches, such as automated valuation models (AVMs) and real-time rental data, to assess rental income. This could lead to more accurate shading factors and faster processing. Additionally, regulatory changes by the Australian Prudential Regulation Authority (APRA) may further standardize how rental income is treated.

FAQ

How much rental income do lenders consider?

Lenders typically consider 75-80% of gross rental income to account for vacancies and expenses. The exact percentage varies by lender and property type.

Can I use projected rental income from a property I haven’t bought yet?

Yes, most lenders accept a rental appraisal from a licensed real estate agent or a valuer’s estimate for prospective investment properties. Some may also use their own internal data.

Does rental income from a granny flat count?

Yes, but it must be legally approved and separately metered. Lenders may require evidence of consistent rental history or a formal appraisal.

How does negative gearing affect my borrowing power?

Negative gearing reduces your borrowing power because the net rental loss is treated as an expense, lowering your surplus income for loan repayments. However, tax benefits from negative gearing are not directly considered in serviceability.

Can short-term rental income be used for a home loan application?

It can, but many lenders require a 12-month history and may apply a higher shading factor due to income volatility. Specialist lenders may be more flexible.

References

• Australian Taxation Office. (2024). Rental properties 2024. https://www.ato.gov.au/individuals-and-families/investments-and-assets/rental-properties
• Australian Securities and Investments Commission. (2023). Responsible lending guidance. https://asic.gov.au/regulatory-resources/credit/responsible-lending/
• Australian Prudential Regulation Authority. (2023). APRA’s prudential framework for residential mortgage lending. https://www.apra.gov.au/prudential-framework-residential-mortgage-lending

Disclaimer: This article is for informational purposes only and does not constitute financial advice. Consult a qualified professional before making investment decisions.