APRA's 6x Debt-to-Income Cap: It Limits Your Bank, Not You

In the March 2026 quarter, Australian banks funded 10.8% of new investment loans at six times the borrower's gross income or more. For owner-occupied loans the figure was 3.9%. A year earlier those shares were 8.2% and 3.7%, so one of them is climbing and the other has barely moved.

Since 1 February 2026, banks have been capped at 20% of their new lending in that high-DTI bucket, counted separately for owner-occupiers and investors. The cap sits on the lender's book, not on your loan, which is why two banks can read the same file in the same week and give you different answers. What follows is the arithmetic that decides which side of six you land on, and the handful of moves that genuinely shift it.

How your debt-to-income ratio is calculated (and how it differs from serviceability)

Your debt-to-income ratio is the total credit limit of all your debts divided by your gross annual income. A household with $1,006,000 of counted debt and $165,000 of gross income sits at 6.1x. APRA treats 6x or above as high-DTI lending.

To work yours out:

1. Add the full credit limit of every debt: the new mortgage, existing mortgages, personal and car loans, credit cards at their limit, buy now pay later and margin loans.
2. Subtract nothing for offset balances or for cards you clear each month, and exclude HECS or HELP.
3. Add up gross annual income before tax, excluding compulsory superannuation, counting bonuses, overtime, commission and gross rent in full.
4. Divide step 1 by step 3.

Formally, APRA's Reporting Standard ARS 223.0 defines the ratio as the credit limit of all debts held by the borrower over that borrower's gross income. Two words there do almost all the damage.

The first is "limit", defined as the maximum funds available without additional authorisation. A $25,000 credit card counts as $25,000 whether you owe nothing on it or you are maxed out. APRA also requires loans to be reported gross of offset balances and redraw facilities, so money parked in offset lowers your interest bill and does nothing to your reported ratio.

The second is "gross": before-tax income, excluding compulsory superannuation, before any discounts under the bank's serviceability policy. Serviceability is where a prudent lender shades bonuses, overtime and rent by at least 20% under APG 223, and where every applicant is tested at their product rate plus a buffer of at least 3.0 percentage points. Our guide to borrowing capacity in 2026 covers that buffer. DTI ignores all of it and uses the raw numbers.

The HECS row changed recently enough that older guidance still circulating in 2026 has not caught up. When APRA revised ARS 223.0, effective 30 September 2025, it ruled that HELP debts must be excluded from the credit limit of all debts for the purposes of calculating the ratio. No lender gets to choose otherwise. Your student debt still counts as a repayment commitment in serviceability, unless your lender applies APRA's exception, finalised on 19 June 2025, for borrowers expected to clear the debt in the near term.

As a benchmark, under 4x sits well inside every lender's own policy, 4x to 6x is ordinary for a capital-city purchase, and 6x or above puts you in the capped bucket. Six times income means $600,000 of total debt on a $100,000 income, $900,000 on $150,000 and $1,200,000 on $200,000. That total includes your card limits.

A worked example: $944,000 borrowed on $165,000 of income

Take a couple on a combined gross income of $165,000. They buy at $1,180,000 with a 20% deposit of $236,000, so they borrow $944,000. They hold two credit cards with limits totalling $28,000, both cleared monthly, $34,000 left on a car loan and $40,000 of HELP debt.

Nothing in that file is reckless. Across the March 2026 quarter the weighted average assessment rate banks used for serviceability was 8.71%, against a weighted average variable rate of 5.90% on loans actually funded, and this couple would probably clear that test. But serviceability is a judgement the bank makes about one household, while DTI is a number it must count and report. Exceptions to serviceability policy ran at 5.1% of new lending funded that quarter, so the discretion plainly exists. There is no equivalent per-borrower exception for DTI, only a hard count in the bank's return.

Now assume they close both credit cards. Counted debt falls to $978,000 and the ratio drops to 5.9x, below the threshold, without a single dollar of their actual finances changing. Two phone calls and two to four weeks of lead time while the credit file updates, and it is the cheapest move most applicants have. What you give up is available credit in an emergency, a real trade-off worth raising with your adviser.

The cap limits the bank, not you

This is the part almost everyone gets wrong. The rule allows each authorised deposit-taking institution (ADI), meaning a bank, building society or credit union, to fund up to 20% of its new investment loans at a DTI of six times or more, and separately up to 20% of its new owner-occupied loans. It is a share of what the lender writes each period, and says nothing about any individual loan.

Within the limit, APRA says, banks retain discretion to lend to creditworthy high-DTI borrowers, in line with their own risk appetite and lending policies. Where a request would risk a breach, the lender could offer a smaller loan or defer the application, and APRA notes that borrowers may seek credit from lenders not close to the limit. The practical effect is queue position and timing.

The two buckets are independent. A bank that is full on high-DTI investor lending can still write high-DTI owner-occupier loans, and the reverse. Measurement differs by size too: significant financial institutions measure the share quarterly and report monthly on form ARF 923.5, while smaller lenders use a rolling four-quarter measure that absorbs a lumpy month. Smaller lenders can therefore have room precisely when the big ones do not, which is a reason to look past the obvious four when you are weighing up home loan options.

Why investor loans hit the 6x limit first

Investors triggered the policy. On APRA's back series, the investor share of new lending at 6x or more climbed from 8.4% in the September 2024 quarter to 10.0% a year later, and the limits were announced on 27 November 2025 against exactly that build-up.

Each bank's limit is 20% of its new lending in each bucket, in force since 1 February 2026. The shares above are system-wide outcomes, not any single bank's position.

The mechanism is arithmetic, not attitude. Gross rent counts in the denominator in full, which actually makes DTI kinder to investors than serviceability, where rent is shaded. The trouble is that a $650,000 investment loan adds $650,000 to the top of the fraction while the rent it produces adds perhaps $30,000 to the bottom. Owner-occupiers usually hold one mortgage. Investors accumulate, and every existing loan travels with them at full limit. One rulebook therefore produces 10.8% on one book and 3.9% on the other, and it is the same pressure behind the 2026 investor exodus.

Keep the scale honest, though. High-DTI lending peaked at 24.3% in the December 2021 quarter, almost four times today's level.

DTI cap exemptions: new builds, off-the-plan and bridging finance

Three categories sit outside the calculation at the major banks: finance for the construction of new dwellings, finance for the purchase of newly erected dwellings, and bridging finance. APRA's reasoning is that bridging loans are temporary, while new-dwelling loans help facilitate housing supply.

Only bridging finance is restricted to owner-occupiers. APRA defines it as owner-occupied lending funded while borrowers intend to transfer their principal place of residence and in the interim also hold an existing owner-occupied loan, expected to complete within twelve months of origination. If you are trading up in a falling market, that double-mortgage window does not eat into anyone's quota.

The two new-dwelling exemptions carry no such restriction, and an investor can use that. A file too heavy for a bank's high-DTI investor bucket may find the same lender untroubled by an equivalent loan for a new build, because APRA's method subtracts exempt high-DTI loans from the numerator and exempt new loans from the denominator. That only holds where the lender actually applies the exemptions. Significant financial institutions must. Smaller ADIs were given a choice, and APRA's default option for them is not to carve exempt loans out at all, so at a smaller lender a new-build loan may count in the bucket like any other. Ask before you rely on it, and treat it as a tiebreaker well below settlement risk and builder solvency when you are buying off the plan.

Note what is not on the list: there is no first-home-buyer carve-out. A small deposit under the First Home Guarantee counts like anybody else's.

How to lower your debt-to-income ratio before you apply

These levers look like the borrowing-capacity list but work differently. DTI counts the whole limit rather than an assessed repayment, so closing a facility outright is worth far more here than paying down what you owe on it.

The deposit moves the number furthest and the cards move it cheapest. The lender you pick decides whether the number matters at all. A family pledge is worth understanding here: it reduces the deposit you need and can remove LMI, but the loan still counts at its full limit, so your ratio is unchanged. Each bank also manages its own quota on its own timetable, and a mortgage broker sees which lenders are tightening across their own submissions, usually earlier than anything a bank announces publicly.

Check the deposit trade-off before you commit. Paying out a $34,000 car loan with deposit money removes $34,000 of debt and adds $34,000 to the mortgage, a wash on DTI and a step backwards on your loan-to-valuation ratio. A loan repayment calculator shows what each version costs.

Lending volumes are easing, which quietly buys back quota room. Investor commitments fell 10.2% to $37.1 billion in the June 2026 quarter and owner-occupier commitments fell 1.9% to $60.5 billion. Incomes are doing far less work, with the Wage Price Index up 3.2% over the year to the June quarter 2026.

What APRA's DTI data cannot tell you

Those 10.8% and 3.9% figures describe what the banking system collectively funded across one quarter. They tell you nothing about what a lender will do with your file next Tuesday. Appetite shifts within a quarter, and no bank publishes where it sits against its quota.

APRA itself flags that the published shares do not account for certain loan category exclusions, and so differ slightly from the measure it uses to monitor compliance. The March 2026 release covers a quarter in which the limit ran for only two of the three months, and June quarter figures were not available at the time of writing. Nothing in APRA, RBA or ABS statistics records how many applications have been declined or deferred because of the limit, so treat any headline claiming a specific number of buyers locked out as invented.

This is general information about a prudential rule, not credit advice. Your ratio depends on facts only a licensed credit adviser working from your actual documents can confirm.

FAQ: APRA's debt-to-income cap

Does the DTI cap mean I can't borrow more than six times my income?

No. The rule limits each bank to no more than 20% of its new lending at six times income or more, counted separately for owner-occupier and investor loans. It caps no individual loan. A lender near its quota may defer you while another with room approves the identical file, which is why a single knock-back tells you very little.

Does my HECS or HELP debt count towards my debt-to-income ratio in 2026?

No. Since ARS 223.0 was revised, effective 30 September 2025, HELP debts must be excluded from the DTI calculation because repayments are income-contingent. This changed only in late 2025, so guidance published before then still says otherwise. Your HELP debt does still reduce your borrowing capacity through serviceability, unless your lender applies APRA's exception for debts expected to be cleared shortly.

Does APRA's DTI cap apply if I am refinancing?

Yes. APRA's reporting form counts both external and internal refinances as new loans funded, and neither appears on the exempt list. Moving to a new bank at 6x or more consumes that lender's high-DTI quota exactly as a purchase does, so a ratio that was acceptable when you first borrowed can make a switch harder than the original approval was. Confirm the treatment before you pay for a valuation.

Do non-bank lenders have to follow APRA's 20% DTI limit?

No. The limit binds authorised deposit-taking institutions under Prudential Standard APS 220, and non-ADI lenders sit outside it, which is why they absorb demand whenever the regulated sector tightens. APRA holds reserve powers to extend its rules to non-ADI lenders if their lending materially contributes to instability, so treat the gap as tolerated rather than permanent.

Where this leaves you

The odd thing about this rule is that it is the first credit constraint in years you cannot fix by being a better borrower. Serviceability rewards effort: pay down the card, take the promotion, and the number moves in your favour. DTI is largely indifferent. You are being fitted into a quota whose remaining space you cannot see.

That should change your order of operations. Get the ratio calculated before you shortlist a suburb, because the distance between 5.9x and 6.1x is a bucket, and buckets do not negotiate. Most buyers reach that question only after they have found the house, which is the more expensive order to do it in. If your ratio sits comfortably below six, none of this applies and you can stop thinking about it.

A buyer's agent cannot move your debt-to-income ratio, and be sceptical of anyone who implies otherwise. If the ratio is your binding constraint, call a broker before you call anyone else. GoMatch will match you to agents once the number is settled. Whoever ends up doing the searching should be briefed with the figure your broker calculated, not the one you had in your head.

Sources

1. APRA, "Activation of debt-to-income limits as a macroprudential policy tool", information paper and implementation details, 27 November 2025.
2. APRA, Reporting Standard ARS 223.0 Residential Mortgage Lending, effective 30 September 2025.
3. APRA, "Clarifying the treatment of HELP debt obligations: response to consultation", 19 June 2025.
4. APRA, "Quarterly authorised deposit-taking institution property exposures statistics, March 2026", released 29 June 2026.
5. APRA, Prudential Standard APS 220 Credit Risk Management and Prudential Practice Guide APG 223 Residential Mortgage Lending.
6. Australian Bureau of Statistics, "Lending Indicators, June quarter 2026", released 14 August 2026.
7. Australian Bureau of Statistics, "Wage Price Index, Australia, June quarter 2026", released 19 August 2026.