The DTI speed limit 2026: how the 6x debt-to-income cap affects you

In February 2026, the Australian Prudential Regulation Authority (APRA) introduced a new macroprudential measure that has quietly reshaped the lending landscape. Known as the DTI speed limit, it caps the proportion of new home loans with a debt‑to‑income ratio above 6x at 20% of each lender’s total new lending. For borrowers with high incomes relative to their deposit or those carrying significant other debts, this rule can be the difference between approval and rejection.

This article explains how the DTI cap works, who is most affected, and what you can do if your loan falls above the 6x threshold.

What is the DTI speed limit?

The debt‑to‑income ratio compares your total borrowing (including the new home loan and any existing debts) to your gross annual income. A DTI of 6x means your total debt is six times your yearly income. For example, if you earn $120,000 and seek a loan of $720,000 with no other debts, your DTI is 6.0.

APRA’s new rule, effective from February 2026, restricts lenders so that no more than 20% of new loan approvals can have a DTI above 6x. This is a portfolio‑level cap, not a blanket ban. But in practice, most lenders will tighten their criteria to stay well within the limit, meaning loans above 6x become harder to obtain.

Why APRA is acting now

APRA’s stated aim is to maintain financial stability by preventing a build‑up of highly leveraged borrowers. During the low‑rate period of 2020‑2023, many households borrowed at DTIs of 7x or 8x. When interest rates rose to 4.35% (the RBA cash rate as of mid‑2026) and the standard variable rate sits around 5.69% , those high‑DTI borrowers face greater mortgage stress.

The 3% serviceability buffer (still in place) already requires lenders to assess borrowers at an interest rate of cash rate + 3%, or about 7.35% . Yet high‑DTI loans remain a vulnerability. APRA’s cap acts as a second line of defence, especially for borrowers who might pass the buffer test due to high income but have thin equity buffers.

How the 6x limit works in practice

Portfolio‑level cap: Each lender must ensure that no more than 20% of new loan originations (by number) have a DTI above 6x. Some lenders may set an even lower internal limit.
Includes all debts: The “debt” side includes the new mortgage, investment property loans, personal loans, credit card limits, Buy Now Pay Later debt, and even HECS/HELP liabilities (though some lenders treat HELP differently).
Income definition: Gross annual income, typically before tax. Overtime, bonuses, and rental income may be included at reduced rates (e.g., 80% of rental income).
Not a hard ban: Loans above 6x can still be approved, but only if the lender has room under the 20% ceiling. In practice, lenders reserve that capacity for high‑net‑worth or low‑risk borrowers.

Example DTI thresholds for a single borrower

· Annual income $80,000: DTI 6x = maximum debt $480,000 · Annual income $100,000: DTI 6x = $600,000 · Annual income $150,000: DTI 6x = $900,000 · Annual income $200,000: DTI 6x = $1,200,000

If you have an existing mortgage or personal debt, the maximum new loan shrinks accordingly.

Who gets caught by the DTI cap?

At first glance, the 6x limit seems generous. However, in high‑cost property markets such as Sydney and Melbourne, many first‑home buyers and upgraders need a loan well above 6x income, especially when interest rates are elevated and deposits are thin.

Typical scenarios that hit the 6x ceiling

High property price relative to income – A dual‑income couple earning $180,000 combined wants to buy a median Sydney house at $1.5 million. With a 20% deposit ($300,000), they need a loan of $1.2 million. DTI = $1.2m / $180k = 6.67x – above the cap.
Investment property buyers – An investor with $100,000 income already has a $400,000 mortgage on their home. To buy a $500,000 investment property with a 20% deposit, they need a $400,000 loan. Total debt = $800,000. DTI = 8x.
Carrying personal debt – A borrower earning $120,000 has a $40,000 car loan and a credit card limit of $10,000 . Even if they want a modest home loan of $600,000 , total debt = $650,000, DTI = 5.42x – below the cap, but if the loan were $720,000, DTI would be 6.4x.
High income but low deposit – A $250,000 earner with a 5% deposit on a $1.2 million property needs a loan of $1,140,000 . DTI = 4.56x – actually below 6x because income is high. The DTI cap tends to affect moderate‑income borrowers in expensive suburbs more than high‑income professionals.

Real‑world example: DTI cap in action

Take a household earning $150,000 annually. They have a $50,000 car loan and a credit card limit of $15,000 . They want to buy a property in Brisbane for $900,000 with a 10% deposit ($90,000), needing a loan of $810,000.

· Total debt = $810k + $50k + $15k = $875,000 · DTI = $875k / $150k = 5.83x – under 6x, so no issue.

Now change the property price to $1 million with the same deposit. Loan = $900,000 . · Total debt = $900k + $50k + $15k = $965,000 · DTI = 6.43x – above 6x. Under the cap, the lender may reject this borrower unless the 20% “bucket” is not full and they qualify as a lower risk.

How to prepare if your loan exceeds the 6x threshold

If you expect your borrowing to push a DTI above 6x, you have several options.

Increase your deposit

A larger deposit reduces the loan amount and lowers DTI. For the example above, a 15% deposit ($150,000) on the $1 million property gives a loan of $850,000, total debt $915,000, DTI = 6.1x – still borderline. A 20% deposit ($200,000) yields loan $800,000, total $865,000, DTI = 5.77x.

Reduce existing debts

Paying down personal loans, car loans, or credit card balances before applying can lower total debt. Even closing unused credit cards (limits count as debt) helps.

Increase your income

While easier said than done, adding a second job, working overtime, or including rental income from an investment property can boost the income denominator. However, lenders may only recognise a portion.

Consider a cheaper property or a different location

The First Home Buyer Guarantee (FHBG) from July 2026 allows a 5% deposit on properties up to $1.5 million in Sydney, $1 million in Brisbane, $950,000 in Melbourne, and $850,000 in Perth. But even with a 5% deposit, the loan amount is near the purchase price, so DTI can be high. Choosing a property below the median can help.

Apply with a lender that has spare capacity

Some smaller lenders or non‑bank lenders may have more room under the 20% cap, but their interest rates may be higher. Shop around.

Make a joint application with a co‑borrower

Adding a second applicant with income can reduce the DTI for the combined entity. For example, if a partner earns $60,000, total household income becomes $210,000, and the $1 million loan yields a DTI of 4.76x – well under 6x.

Frequently Asked Questions

Q1: Does the DTI cap apply to refinancing? Yes, APRA’s measure applies to new loan originations, which includes refinancing with a new lender (cash‑out or debt consolidation). If you are simply switching to a better rate with the same lender, it may be treated as a variation, but many lenders apply the same DTI check.

Q2: My DTI is 5.8x. Will I be affected? No. The cap only applies to loans with a DTI above 6x. At 5.8x, you are safe. However, if you have variable income or the lender reassesses your income conservatively, your DTI could be recalculated higher.

Q3: How does the DTI cap interact with the 3% serviceability buffer? The buffer (assess at cash rate + 3% = 7.35% ) is designed to ensure you can afford higher repayments. The DTI cap is a separate constraint. You must satisfy both. A borrower with a DTI of 5.5x can still fail the buffer test if their expenses are high. Conversely, a borrower with DTI of 6.5x might pass the buffer test but be blocked by the DTI cap.

Q4: If I have HELP debt, does it count in the DTI calculation? Some lenders include the HELP balance as debt; others treat the compulsory repayment as an expense. It depends on the lender. Generally, if the lender counts it as debt, a HELP loan of $30,000 would add to your total debt, raising the ratio.

Q5: What is the maximum DTI a lender can approve under the cap? There is no official maximum DTI, but most lenders will avoid approving loans above 7x because they want to reserve the 20% bucket for low‑risk cases. A few lenders may go to 8x for high‑income professionals with strong savings history. Expect to pay a higher interest rate for loans above 6x.

Sources

Australian Prudential Regulation Authority (APRA), Macroprudential Policy Statement, February 2026.
Reserve Bank of Australia (RBA), Cash Rate Target and Market Operations, July 2026.
Housing Australia, First Home Buyer Guarantee Scheme – Program Parameters 2026‑27, effective 1 July 2026.
NSW Revenue Office, Property Price Caps for FHBG, updated July 2026.
APRA, Letter to ADIs on DTI Benchmark, 15 February 2026.

What to do next

If you are wondering whether the DTI cap will affect your borrowing power, use our borrowing power calculator to estimate your maximum loan and see your DTI. For personalised advice, talk to a qualified mortgage broker.

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· How much can I borrow in 2026? · APRA serviceability buffer 2026 – still 3% · My borrowing power dropped in 2026 – what changed?

Disclaimer: The information in this article is general in nature and does not constitute financial advice. Individual circumstances vary. Always consult a licensed mortgage professional.