How Australian Banks Really Calculate Borrowing Power on Foreign Currency Income (And Why It Varies by Lender)
TL;DR
- Australian lenders shade (discount) foreign income, typically by 10-20%, before assessing borrowing power – but the exact percentage differs by lender and currency.
- Your borrowing power is calculated from net income minus living expenses, taxes, existing debts, and a stress-tested interest rate buffer.
- Not all lenders accept all foreign currencies – lender selection is as important as the application itself.
- Lender policies on foreign income are not publicly published and change regularly; working with a specialist broker with live lender data is the most effective way to navigate this.
- Borrowing power, LVR, and approval outcomes depend on individual circumstances and lender policy.
What Is Borrowing Power and How Is It Actually Calculated?
Borrowing power (also called borrowing capacity) is the maximum loan amount a lender is willing to extend to you, based on their assessment of your income and expenditure. According to Australian Mutual Bank, it is “an amount based on an assessment of your income and expenditure” – a straightforward definition that masks a surprisingly complex calculation for anyone earning overseas.
The standard formula is:
Gross income – (tax + existing commitments + new loan repayments + living expenses) = surplus income
That surplus income determines how large a loan you can service. According to Unloan, borrowing capacity is “usually calculated by subtracting your total expenses, including your potential mortgage repayments, from your gross income.”
For Australian residents earning in AUD, this is relatively straightforward. For an expat earning in a foreign currency, every single input in that formula is complicated by currency risk, income shading, and overseas tax treatment.
What Is Income Shading and Why Do Lenders Apply It?
Income shading is a risk discount that lenders apply to foreign currency income before it enters their serviceability calculation. Rather than accepting your gross overseas salary at full face value, lenders reduce it by a set percentage to account for exchange rate volatility.
A simplified example:
– You earn the equivalent of AUD $300,000 per year in USD.
– A lender with a 20% shade applies a 20% discount, treating your income as AUD $240,000 for serviceability purposes.
– A lender with a 10% shade treats it as AUD $270,000.
– That AUD $30,000 difference in recognised income can translate to a significant difference in the loan amount you qualify for.
Many people assume borrowing power is based purely on income – but for expats, the currency haircut applied before income even enters the formula is one of the most consequential variables in the entire assessment.
Key points about income shading:
– Shading percentages typically range from 10% to 20%, but some lenders apply higher discounts to less commonly traded currencies.
– The discount is applied to the AUD-equivalent value after conversion, not to the foreign currency amount itself.
– Lender policies on shading are not publicly published and are subject to change at any time.
– Some lenders apply different shading rates depending on whether income is employment-based, self-employed, or contract income.
How Do Living Expenses Factor In for Expat Borrowers?
Living expenses are a significant variable in any borrowing power calculation. Banks use the Household Expenditure Measure (HEM) as a benchmark to estimate living expenses – and then compare this against borrower-declared expenses, using the higher of the two figures.
For expats, this creates a nuanced situation:
– If you are living abroad in a high cost-of-living city (Hong Kong, Singapore, London), your declared expenses may exceed the HEM benchmark and reduce your assessed borrowing power.
– Some lenders will adjust their HEM benchmarks based on the country of residence; others apply the Australian HEM regardless.
– Once you repatriate, your living expenses profile changes – some lenders factor in future projected expenses if you intend to return to Australia before settlement.
The RBA has noted that cash-flow-based serviceability calculations interact with debt serviceability ratios (DSR) to determine loan sizes – meaning living expenses are not just an input, they actively constrain the total debt exposure a lender will approve.
Why Does Borrowing Power Vary So Much Between Lenders?
Two expats with identical incomes and debt profiles can receive materially different borrowing power assessments from different lenders. Your capacity to repay a loan is determined by commonly known factors such as your loan-to-value ratio, income, debts, savings, and spending history – but what makes expat lending complex is that each lender interprets these inputs differently.
| Variable | What Varies by Lender |
|---|---|
| Income shading rate | 10%, 15%, 20% – or higher for some currencies |
| Accepted currencies | Major currencies broadly accepted; minor currencies restricted |
| Serviceability buffer | Applied over the actual rate; rate and buffer interact |
| HEM benchmark | Australian HEM vs. country-adjusted HEM |
| Overseas tax treatment | Some lenders gross up; others do not |
| Verification documents | Payslips, employer letters, tax filings vary by jurisdiction |
According to Auswide Bank, borrowing power is not a fixed number – it shifts based on which lender assesses your application and how they apply their internal policies. For an Australian expat home loan, lender selection is therefore a strategic decision, not an administrative one.
This is precisely where ODIN Mortgage’s proprietary foreign income lender data becomes critical. After 10+ years and 2,300+ client cases, ODIN holds live, lender-by-lender data on income shading policies, acceptable currencies, and documentation requirements across 40+ Australian lenders. This information is not available publicly – it is the product of sustained specialist deal flow.
Frequently Asked Questions
Does my foreign currency income count toward an Australian home loan?
Yes, most major Australian lenders will accept foreign currency income for serviceability purposes, subject to income shading and currency acceptance policies. Outcomes depend on your individual circumstances and lender policy.
What currencies do Australian lenders typically accept?
Major currencies including USD, HKD, SGD, AED, and GBP are broadly accepted by many lenders. Acceptance of less common currencies varies significantly. Lender policies are subject to change.
Can I get an overseas income home loan without a local Australian income?
Yes. Many lenders assess borrowing power solely on foreign income, provided it meets their verification and shading requirements. Borrowing outcomes depend on individual circumstances.
How does income shading affect how much I can borrow?
Income shading directly reduces the income figure used in your serviceability calculation, which lowers your assessed borrowing power. A 10% difference in shading rates can meaningfully change your eligible loan amount.
What documents do Australian lenders require to verify overseas income?
Requirements vary by lender and jurisdiction. Typically: recent payslips, employer confirmation letter, foreign tax returns or assessment notices, and bank statements. Some lenders require certified translations.
Does the serviceability buffer apply to expat borrowers?
Yes. Australian lenders apply a serviceability buffer above the actual interest rate when assessing whether you can service the loan. This is standard practice across the market and applies regardless of where you live.
Should I use a specialist broker for an expat mortgage application?
Given that lender policies on foreign income vary significantly and are not publicly disclosed, a specialist broker with current lender intelligence will generally produce better outcomes than applying directly or through a generalist broker.
About ODIN Mortgage
ODIN Mortgage is Australia’s specialist mortgage brokerage for Australian citizens, permanent residents, and foreign investors living overseas. Part of ODIN alongside Odin Tax, ODIN Mortgage provides borrowing power assessments, loan structuring, and settlement support using overseas income across 40+ lender relationships – fully remote, from any country. Regulated under ASIC and the National Consumer Credit Protection Act (NCCP), ODIN Mortgage won Best Boutique Non-Franchise Office at the Better Business Awards 2024 and holds a 4.9/5 Google rating from 400+ verified client reviews. Headquartered in Hong Kong, ODIN is the only integrated expat property team combining mortgage, tax, and conveyancing under one roof.
This article contains general information only and does not constitute personal credit advice. Borrowing power, LVR, and approval outcomes depend on individual circumstances and lender policy, which is subject to change. Please consult a qualified mortgage broker for advice specific to your situation.
Ready to understand exactly how much you can borrow on your foreign currency income? Book a borrowing power assessment with ODIN Mortgage at www.odinmortgage.com. No guesswork, no generic calculators – real lender data applied to your specific income profile.
References
- Australian Mutual Bank. Understanding borrowing capacity. https://australianmutual.bank/news-blog/articles/understanding-borrowing-capacity/
- Unloan. How banks calculate your borrowing capacity in Australia. https://www.unloan.com.au/learn/how-do-banks-calculate-your-borrowing-capacity
- Auswide Bank. What is borrowing power and how is it determined? https://www.auswidebank.com.au/news-blogs/articles/what-is-borrowing-power-and-how-is-it-determined/
- Reserve Bank of Australia. Box B: The Impact of Lending Standards on Loan Sizes, Financial Stability Review October 2018. https://www.rba.gov.au/publications/fsr/2018/oct/box-b.html
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