Debt-to-Income Ratio Calculator

What is a Good Debt-to-Income Ratio in Australia?

Australian lenders assess DTI ratios differently from lenders in the United States, where DTI thresholds are more standardised. In Australia, lenders tend to look at overall debt-to-income as well as the serviceability of individual debts. Here is a general guide to how different DTI levels are viewed.

Under 28% — Excellent A DTI below 28% is considered very healthy. You have significant income available above your existing debt commitments, which makes you an attractive borrower to most lenders. You are likely to qualify for most loan products at competitive rates.

28% to 36% — Good A DTI in this range is considered manageable and is acceptable to most Australian lenders. You have a reasonable buffer between your income and debt commitments, though lenders will still look carefully at your overall financial position.

36% to 43% — Moderate A DTI in this range may attract closer scrutiny from lenders. Some lenders will still approve applications in this range, but you may face stricter conditions or be offered a lower loan amount than you applied for.

43% to 50% — High A DTI above 43% is considered high by most Australian lenders. Approval becomes more difficult, and you may need to reduce your existing debts before applying or apply with a co-borrower to improve your combined position.

Above 50% — Very High A DTI above 50% means more than half of your gross income is going toward debt repayments. Most mainstream Australian lenders will decline applications at this level. Reducing debt before applying is strongly recommended.

The APRA 6x income benchmark In addition to the monthly DTI calculation, Australian lenders also apply a total debt-to-income benchmark. APRA has flagged that loans where total debt exceeds six times the borrower's annual income are considered high risk. If your total outstanding debt — including the new loan you are applying for — exceeds six times your annual income, many lenders will decline or limit the amount they are willing to lend.

What Counts as Debt in Your DTI Calculation?

When calculating your debt-to-income ratio, it is important to include all regular debt repayments — not just the ones you think of as loans. Australian lenders typically include the following when assessing your DTI.

Include in your DTI:

• Mortgage repayments or rent payments

• Car loan repayments

• Personal loan repayments

• Credit card minimum monthly payments (based on your full credit limit, not just the balance)

• Buy-now-pay-later repayments

• HECS-HELP repayments (based on your income level)

• Child support or maintenance payments

• Any other regular financial obligations

Important — credit card limits vs balances Australian lenders assess your full credit card limit as a monthly liability — not just the balance you carry. This is calculated as a percentage of the limit (typically 3% per month). For example, a $10,000 credit card limit is counted as a $300 monthly debt obligation regardless of your actual balance. This catches many borrowers by surprise and is one reason why reducing or closing unused credit cards before applying for a loan can significantly improve your DTI.

Do not include:

• Day-to-day living expenses such as groceries, utilities, and transport

• Insurance premiums

• Savings contributions

• Investment expenses

How to Improve Your Debt-to-Income Ratio in Australia

If your DTI is higher than you would like before applying for a loan, there are several practical steps you can take to improve it.

Pay down or pay off existing debts The most direct way to lower your DTI is to reduce your monthly debt obligations. Focus on paying off smaller debts first to eliminate those monthly repayments entirely, or target the highest-rate debt to reduce the total cost. Even eliminating one car loan or personal loan repayment can make a meaningful difference to your ratio.

Close or reduce credit card limits Because lenders count your full credit card limit as a liability — not just the balance — reducing or closing unused cards can significantly lower your assessed monthly debt obligations without requiring you to repay anything. For example, cancelling a $15,000 credit card you rarely use could reduce your monthly debt assessment by $450 (at 3% of the limit).

Increase your income A higher gross income improves your DTI even if your debts stay the same. This could include taking on additional work, negotiating a salary increase, adding a rental income source, or including a co-borrower's income in a joint application.

Apply with a co-borrower Adding a partner or family member as a co-borrower combines both incomes and debts. If the co-borrower has a strong income and low debts, this can significantly improve your joint DTI.

Avoid taking on new debt before applying Do not take out new loans, increase credit card limits, or make large buy-now-pay-later purchases in the months before applying for a loan. Each new debt obligation increases your DTI and may affect your approval chances.

Debt-to-Income Ratio vs Serviceability — What is the Difference?

In Australia, lenders use two related but distinct measures to assess whether you can afford a loan — the debt-to-income ratio and the serviceability assessment.

Debt-to-income ratio As discussed above, your DTI compares your total debt repayments to your gross income as a percentage. It is a broad measure of how much of your income is already committed to debt.

Serviceability assessment Serviceability goes a step further. Australian lenders assess whether you could still afford your repayments if interest rates were to rise — typically by adding a buffer of at least 3% above the actual loan rate, as required by APRA. This is called the serviceability buffer or stress test. If you cannot demonstrate that you could afford repayments at the higher rate, the lender may decline your application or reduce the amount they are willing to lend.

Both measures work together to give lenders a picture of your financial resilience. A borrower with a low DTI but who fails the serviceability stress test may still be declined. Understanding both concepts can help you prepare your finances more effectively before applying.

Frequently asked questions

What is a debt-to-income ratio?

A debt-to-income ratio (DTI) measures the percentage of your gross monthly income that goes toward debt repayments. It is calculated by dividing your total monthly debt repayments by your gross monthly income and multiplying by 100. For example, $2,000 in monthly debt repayments on a $7,000 gross monthly income gives a DTI of approximately 28.5%.

Can I improve my DTI quickly before applying for a loan?

Yes. The fastest ways to improve your DTI are to close or reduce credit card limits, pay off smaller loans to eliminate those monthly repayments, and avoid taking on any new debt. Increasing your income — even through a secondary income source — also improves your ratio. For a home loan application, it is worth starting this process three to six months before you plan to apply.

What DTI do I need to get a home loan in Australia?

Most Australian lenders prefer a DTI below 36% for home loan applications, though some will lend to borrowers with higher ratios depending on other factors such as deposit size, employment stability, and credit history. APRA also monitors loans where total debt exceeds six times annual income, which many lenders use as an additional benchmark.

Is DTI the same as a credit score?

No. Your credit score reflects your borrowing and repayment history — how reliably you have met past obligations. Your DTI ratio reflects your current financial capacity — how much of your income is already committed to debt. Lenders use both measures when assessing loan applications. A high credit score does not automatically offset a high DTI.

Does HECS-HELP debt affect my DTI in Australia?

Yes. Australian lenders include HECS-HELP repayments when calculating your debt obligations. Your HECS repayment is determined by your income level and is deducted from your take-home pay, which effectively reduces your net income available for loan repayments. This can have a meaningful impact on your assessed DTI, particularly for recent graduates with significant HECS balances.

What is the difference between front-end and back-end DTI?

Front-end DTI includes only housing-related costs — mortgage or rent, rates, and insurance — as a percentage of gross income. Back-end DTI includes all debt repayments including housing, car loans, credit cards, and personal loans. Australian lenders typically focus on the back-end DTI as it gives a more complete picture of your total debt obligations.

Do credit card balances or credit card limits affect my DTI?

In Australia, lenders assess your full credit card limit — not just the balance you carry — as a monthly liability, calculated at approximately 3% of the limit per month. This means a $10,000 credit card limit adds $300 to your monthly debt obligations regardless of your actual balance. Reducing or closing unused credit cards before applying can significantly improve your DTI.

Does this calculator give the same result as a lender's assessment?

This calculator provides a reliable estimate based on the figures you enter. However, lenders in Australia may use slightly different formulas, apply additional benchmarks such as the APRA serviceability buffer, or assess certain debts differently. Use this as a planning tool to understand your approximate position before speaking with a lender or mortgage broker.

Know Your DTI Before You Apply

Understanding your debt-to-income ratio before you approach a lender puts you in a much stronger position. You will know whether your current DTI is likely to be acceptable, what steps you can take to improve it, and how different borrowing amounts would affect your ratio.

Use this calculator alongside our other free tools to build a complete picture of your financial position before applying for any loan.

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