Debt-to-income ratio (DTI) for Australian home loans: APRA's 6x cap, what it actually restricts, and how to improve your position before applying

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If your borrowing capacity looked fine but the application still came back tight, the constraint is often debt-to-income ratio (DTI) — and since February 2026 it works differently from the way most published guides describe it.

General information only, not personal credit advice.

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1) The thing almost every guide gets wrong

Search "debt-to-income ratio Australia" and you will find comparison sites telling you that ANZ caps DTI at 9, or 7.5, or that NAB stops at 8 or 9. Those pages disagree with each other about the same two banks, and most of them describe the world before 1 February 2026.

Here is what actually changed. On that date APRA activated debt-to-income limits as a macroprudential tool. An authorised deposit-taking institution may now write no more than 20% of its new owner-occupier lending, and no more than 20% of its new investor lending, at a DTI of six times or more — with the two portfolios measured separately (APRA: Activation of debt-to-income limits).

Read that carefully, because the distinction is the whole point:

The 20% cap applies to the lender's book. It is not a rule about you.

There is no regulation that says a bank must decline you at 6.1x. A bank can lend to you at 6.5x, or 7x, and stay perfectly compliant — as long as loans like yours stay under a fifth of what it writes. What the cap changes is how selective lenders become about who gets those slots.

A page that tells you "a DTI above 6 means your application will be denied" has misdescribed a portfolio constraint on lenders as an approval test on borrowers. That is the single most common error in this topic.

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2) How to calculate your DTI

DTI = total debt ÷ gross annual income

Worked example:

Two lines in that table catch people out.

Credit cards count at their limit, not your balance. A card you never use with a $15,000 limit adds $15,000 of debt to the calculation. Closing or reducing dormant limits is the fastest single lever most borrowers have.

HECS-HELP is debt. Lenders differ on how they treat it in serviceability — some exclude the repayment where the balance will clear shortly, and policy varies by lender — but the balance itself typically counts in DTI. If you are close to a threshold, see what changed for HECS-HELP borrowing power in 2026 and the lender-by-lender breakdown.

Lenders also shade variable income — bonus, overtime, commission, rental — before dividing. That is why your own calculation often lands lower than the lender's.

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3) The exemptions nobody mentions

The DTI limit does not apply to everything. APRA carved out three categories, and they are directly actionable:

• Finance for construction of a new dwelling
• Purchase of a newly erected dwelling
• Bridging finance (on a 12-month expectation)

This is a genuine structural advantage for building rather than buying established, and it stacks with the tax changes coming on 1 July 2027, which restrict negative gearing on established property to new builds. If you are weighing a new build against an existing home, the finance side now leans the same way the tax side does — see buying an investment property before 30 June 2027.

Two more details worth knowing:

Measurement differs by lender size. Significant Financial Institutions are measured quarterly; smaller ADIs on a four-quarter rolling basis. The practical consequence is that a large bank approaching its cap late in a quarter behaves differently from one at the start of a fresh period, and a smaller lender averaging over a year has more room to be flexible in any given month. This is invisible from outside, and it is a large part of what a broker is actually tracking.

It applies to new lending only. Existing borrowers are not affected — but refinancing counts as new lending. If your DTI has risen since you took the loan out, switching lenders puts you back through the test. That matters most for borrowers whose property value has fallen, which is currently the case across most capital cities.

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4) Is the cap actually binding?

Honestly, not yet at system level. In its June 2026 submission to the Senate Select Committee on Productivity, APRA reported that lending at a DTI of six or more was under 10% of total lending as at December 2025 — half the permitted share (APRA submission, PDF).

So the limit was not immediately restrictive across the market. What it does is put a ceiling in place that binds specific lenders at specific times, and it makes every bank conscious of how it spends a scarce allocation. When a slot is scarce, it goes to the cleanest file.

That is the real-world effect: not a wall, but a queue you want to be near the front of.

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5) DTI is not serviceability, and both must pass

APRA reconfirmed in May 2026 that the serviceability buffer stays at 3 percentage points, the countercyclical capital buffer remains 1%, and there are no formal macroprudential limits on high-LVR lending (APRA: macroprudential settings maintained).

The buffer and the DTI cap are separate tests and you must satisfy both at origination. With the cash rate at 4.35% and variable rates where they are, a 3-point buffer puts most assessment rates in the region of 9%. You can clear the buffer comfortably and still sit above 6x, or sit below 6x and fail the buffer on expenses and dependants. They measure different things.

For the serviceability layer, see mortgage serviceability explained and the borrowing power calculator.

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6) Who actually gets squeezed

In practice the borrowers who feel the cap are:

1. High-income, high-borrowing metropolitan buyers. At 6x, a $950,000 loan needs roughly $158,000 of gross income to sit under the threshold. In Sydney and Melbourne that is a very ordinary purchase and a well-above-average income.
2. Investors adding a second or third property, because existing property debt counts in full while rent is shaded. See investor DTI — when lenders say yes, but and rent shading.
3. Borrowers with large undrawn credit limits, who are carrying debt on paper that they do not have in reality. See credit card limits vs balances.
4. Recent graduates with significant HECS-HELP balances buying at metropolitan prices.

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7) A 30–90 day playbook

Step 1: Inventory liabilities the way a lender sees them

Home loan balances, credit card limits, personal and car finance, HECS-HELP balance, existing property debt, BNPL and store finance. Do this before you start attending open homes.

Step 2: Cut limits, not just balances

Reducing a $20,000 card limit to $5,000 removes $15,000 of assessed debt immediately. On a $129,000 income that is about 0.12x off your DTI for no cash outlay. Dormant cards kept "for the points" are the most expensive points in Australia.

Step 3: Clear small high-cost debts first

A $9,000 car loan removed does more for both DTI and serviceability than the same amount shaved off a mortgage.

Step 4: Document income quality

Where income is variable, cleaner evidence changes how much of it survives shading — and shading is applied to the denominator of your DTI. If self-employed, see the documents checklist.

Step 5: Sequence lenders rather than shotgunning

Multiple applications generate multiple credit enquiries and do not increase your odds. See why home loans get declined.

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8) The honest broker point

If your DTI is above 6, the answer is usually lender selection, not a smaller loan.

Because the cap is a portfolio limit measured on different cycles by institutions of different sizes, lenders' appetite for above-6x lending varies week to week in ways no published table captures — which is exactly why the tables you find online contradict each other. The Canstar and Mozo numbers are not merely out of date; the thing they are trying to describe is not stable enough to publish as a static figure.

Sometimes the answer genuinely is to reduce the loan or wait a quarter. Often it is to take the same file to a lender with room on its book. Working out which one applies to you is the job.

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9) Official references

• APRA: Activation of debt-to-income limits — the operative letter
• APRA: Macroprudential policy settings maintained, May 2026
• APRA: Submission to Senate Select Committee on Productivity, June 2026
• APRA: Quarterly ADI property exposure statistics
• RBA: Recent drivers of housing loan arrears
• ASIC: RG 209 responsible lending conduct
• Moneysmart: Home loans hub

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Final word

A DTI above six is not a decline. It is a signal that your file needs to be clean, your liabilities tidy, and your lender chosen deliberately rather than alphabetically.

If you want that translated into a lender-ready plan, send a short brief: income type, existing debts and limits, target loan amount, and timeline.

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