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Guide & How-To
Check whether your new Australian home loan falls within APRA's 20% high-DTI lending cap that took effect on 1 February 2026. Enter your gross annual income, current total debt, and proposed new loan amount to calculate your debt-to-income ratio, determine whether it exceeds the 6x threshold, see your available borrowing slack before hitting the cap, and estimate your total monthly debt obligations after the new loan.
What Is the APRA DTI Cap and How Does It Work?
From 1 February 2026, the Australian Prudential Regulation Authority (APRA) requires banks and other authorised deposit-taking institutions (ADIs) to limit high debt-to-income lending to no more than 20% of new mortgage origination. A 'high DTI' loan is defined as one where the borrower's total debt equals or exceeds six times their gross annual income. The cap applies separately to owner-occupier and investor loan portfolios and is measured on a quarterly basis.
Who Is Most Affected by the DTI Cap?
Property investors are the primary target of the new rule. Approximately 10% of investor loans already exceed the 6x DTI threshold, compared to just 4% of owner-occupier loans. Portfolio investors with multiple mortgages are most exposed. Bridging loans and loans for new dwelling construction or purchase are fully exempt. Non-bank lenders such as Pepper Money, Liberty Financial, and Resimac are not subject to the APRA DTI cap.
DTI Threshold Calculations and Example?
A borrower earning $100,000 per year with $540,000 in existing debt has a DTI of 5.4x, below the 6x threshold. If they apply for an additional $200,000 investment loan, their total debt rises to $740,000 and their DTI to 7.4x — entering the high-DTI zone. The bank could still approve this loan, but only if it has remaining capacity within its quarterly 20% high-DTI allocation. This calculator helps you understand exactly where you stand before approaching a lender.
Debt-to-Income Ratio and APRA DTI Cap Formula
The debt-to-income (DTI) ratio measures a borrower's total debt obligations relative to their gross annual income. Under APRA's new macroprudential rules effective 1 February 2026, a DTI ratio of 6 or higher is classified as 'high-DTI' lending. Banks and authorised deposit-taking institutions (ADIs) must limit new high-DTI loans to no more than 20% of their quarterly mortgage origination, measured separately for owner-occupier and investor portfolios.
The DTI cap is a lender-level quota, not a hard borrowing cap for individuals. A borrower with a DTI above 6x can still be approved if the lender has remaining capacity within its 20% allocation. The cap complements APRA's existing 3% serviceability buffer, which tests the borrower's ability to repay at higher interest rates.
Calculation Steps:
- Determine your gross annual income before tax. This is the denominator for the DTI ratio.
- Calculate your total existing debt: sum all mortgages, personal loans, car loans, and credit card limits (lenders typically assess 3% of the credit card limit as a monthly liability).
- Add your proposed new loan amount to your existing debt to find your total debt after the new loan.
- Divide total debt after the new loan by gross annual income to find your DTI multiplier (e.g., $750,000 / $100,000 = 7.5x).
- If the DTI multiplier is 6 or greater, the loan falls into the high-DTI category that counts toward the bank's 20% quarterly quota.
- Calculate the maximum additional debt you can take on before hitting the 6x threshold: Max Debt = (6 x Income) - Current Debt.
- Estimate your monthly debt payments including the new loan by multiplying the new loan amount by approximately 0.00639 (representing principal and interest at ~6.6% over 30 years).
- Check whether your total debt position would be better served by targeting exempt lending categories (new builds, construction loans) or accessing non-bank lenders that are not subject to the DTI cap.
Real-World Worked Example
Step 1: A property investor earns $120,000 gross per year and currently holds $540,000 in mortgage debt across two investment properties. They have no personal loans or credit card debt.
Step 2: Their current DTI is $540,000 / $120,000 = 4.50x, well below the 6x threshold.
Step 3: They apply for a new $200,000 investment property loan. Total debt after the loan would be $740,000.
Step 4: Their DTI after the new loan = $740,000 / $120,000 = 6.17x, exceeding the 6x threshold and entering the high-DTI zone.
Step 5: The bank can still approve this loan, but it counts toward the lender's 20% quarterly high-DTI quota. If the quota is full, the borrower must either wait for the next quarter, approach a different lender with remaining capacity, or use a non-bank lender.
Step 6: If the borrower instead targets a new dwelling purchase ($200,000 construction loan for a new build), the loan is exempt from the DTI cap entirely under APRA's new-build exemption.
Step 7: The borrower's estimated monthly debt payments after the new loan would be approximately $3,200 (existing) + $1,278 (new loan P&I at 6.6%) = $4,478 per month.
In-Depth Financial Analysis
The APRA DTI cap was announced on 27 November 2025 and took effect on 1 February 2026. It applies to all authorised deposit-taking institutions (ADIs) in Australia — banks, building societies, and credit unions. The cap limits high-DTI loans (DTI >= 6x) to no more than 20% of new mortgage lending, measured on a quarterly basis.
The cap applies separately to owner-occupier and investor portfolios. This means banks cannot cross-subsidise between the two pools — each must independently stay within the 20% limit. As of the September 2025 APRA quarterly data, high-DTI lending stood at approximately 6.1% of new lending, with investor loans more than twice as likely to exceed 6x DTI compared to owner-occupier loans (10% vs 4%).
The policy was triggered by a surge in investor lending (up 18% in the September 2025 quarter), housing credit growth running above its long-term average, and national median dwelling prices reaching $993,817 (CoreLogic, January 2026). The RBA's cash rate increase to 3.85% on 3 February 2026 — just two days after the cap activated — created a combined tightening effect.
Two key exemptions exist: (1) bridging loans for owner-occupiers, which are temporary and do not represent permanent increased leverage; and (2) loans for the construction or purchase of new dwellings, designed to support housing supply. Non-bank lenders (Pepper Money, Liberty Financial, Resimac, La Trobe Financial, Firstmac) are not subject to the DTI cap as they are not ADIs, though APRA has powers to extend macroprudential measures to them if they materially contribute to financial stability risks.
The DTI cap is calibrated to be relatively permissive by international standards. New Zealand limits DTI to 6x (owner-occupier) and 7x (investor), Ireland caps at 3.5x, and the UK restricts DTI >= 4.5x to 15% of new lending. APRA's 20% at 6x threshold means the measure is unlikely to bind at current lending volumes but is designed to act as a pre-emptive stabiliser.
Legal & Regulatory Guidelines (2026)
APRA's DTI limit was activated under the Banking Act 1959 and is enforceable against all ADIs. Non-compliance can result in increased capital requirements and supervisory action.
The measure sits alongside APRA's existing macroprudential toolkit: the 3% mortgage serviceability buffer (unchanged) and the 1% counter-cyclical capital buffer.
APRA has signalled it may tighten the cap (reduce below 20% or introduce investor-specific sub-limits) if high-DTI lending accelerates. The regulator also has reserve powers under Part IIB of the Banking Act to apply measures to non-ADI lenders.
The Australian Competition and Consumer Commission (ACCC) was consulted during the design phase to mitigate potential negative impacts on competition, particularly for smaller ADIs.
Key Strategic Takeaways
- The DTI cap is a lender quota, not a borrower hard limit — loans above 6x DTI can still be approved if the bank has remaining quarterly allocation.:
- New build and construction loans are fully exempt from the DTI cap, making them a powerful strategic tool for investors approaching the 6x threshold.:
- Non-bank lenders are not subject to the cap but typically charge 0.50–1.50% higher interest rates than major banks.:
- Rate cuts increase DTI ratios: every 1% reduction in interest rates lifts DTI by approximately 0.5x for leveraged borrowers.
- The 20% cap is not binding at current levels (~6.1% high-DTI share) but acts as a pre-emptive guardrail for future credit growth.:
- Investors are disproportionately affected: 10% of investor loans exceed 6x DTI versus 4% of owner-occupier loans.
Common Pitfalls to Avoid
- Confusing the DTI cap with the serviceability buffer — they are complementary tools measuring different risks (lender quota vs borrower affordability).
- Assuming the DTI cap is a hard individual borrowing limit — it is a lender portfolio limit that restricts how many high-DTI loans the bank can issue.
- Forgetting to include credit card limits in DTI calculations — lenders typically assess 3% of the credit limit as a monthly liability.
- Overlooking the new-build exemption — this is the most powerful strategy for investors needing additional borrowing capacity.
- Not considering non-bank lenders as an alternative when a major bank's quarterly high-DTI quota is exhausted.
Parameters & Input Definitions
Review the glossary of terms used in the calculation model below. Click on highlighted links to read more in-depth definitions in our financial glossary:
| Parameter | Definition & Context |
|---|---|
| Gross Annual Income | Your total annual income before tax. Lenders use gross income for DTI calculation — not after-tax or negatively geared cash flow. |
| Current Total Debt | The sum of all outstanding debt balances including mortgages, personal loans, car loans, and assessed credit card liabilities. |
| New Loan Amount | The proposed additional borrowing amount you want to add to your existing debt portfolio. |
| Existing Monthly Debt Payments | Your current total monthly commitments across all debt products (mortgage repayments, personal loan installments, minimum credit card payments). |