APRA Borrowing Power 2026: 3% Buffer, DTI Cap and How Much You Can Borrow

APRA’s 3% serviceability buffer is the single biggest number shaping how much you can borrow in 2026. Banks must assess your ability to repay at your loan’s product rate plus 3.0 percentage points — confirmed by APRA as still 3% at May 2026. This means if your actual loan rate is 5.5%, the lender tests whether you could afford repayments at 8.5%. The gap between the real rate and the assessment rate directly reduces your maximum loan amount, often by $100,000 or more compared to testing at the actual rate. Since February 2026, banks also face a 6x debt-to-income cap: no more than 20% of new lending in each portfolio can go to borrowers with DTI of 6 or above.

The key APRA rules in 2026, in plain terms:

• Assessment rate = product rate + 3.0 percentage points (buffer), confirmed as at May 2026
• DTI ratio ≥ 6 restricted to 20% of new lending per bank portfolio (from February 2026)
• Lenders also apply a floor rate (usually around 5.5–6.0%) — even if the buffer-adjusted rate is lower, the floor applies
• Living expenses are benchmarked using the Household Expenditure Measure (HEM) or your declared expenses, whichever is higher

How much does the 3% buffer actually reduce your borrowing power?

For a single borrower earning $90,000 with no debts and typical living expenses: at an actual rate of 5.5%, monthly principal-and-interest repayments on a $500,000 loan over 30 years are about $2,839. At the 8.5% assessment rate (5.5% + 3% buffer), the same $500,000 loan costs about $3,844 per month — a difference of $1,005 per month that the lender must be satisfied you can afford. The bank calculates your maximum loan by working backwards from your after-tax income minus living expenses, at the assessment rate, not the real rate.

For a couple earning $150,000 combined ($12,500 per month gross): after tax, the take-home is roughly $9,700 per month. If living expenses are assessed at $3,500 per month, there is about $6,200 per month available for debt service. At the 8.5% assessment rate, that translates to a maximum loan of roughly $800,000–$850,000 depending on the lender. At the real rate of 5.5%, the same $6,200 would support a loan of over $1,000,000. The 3% buffer costs this couple approximately $150,000–$200,000 in borrowing capacity.

For a single on $120,000 with a HECS debt and a car loan: the HECS repayment and car loan reduce available income, and the assessment rate magnifies the impact because every dollar of outgoing is tested against a higher rate assumption. The result is often a borrowing capacity $80,000–$150,000 lower than the borrower expects from an online calculator that uses the advertised rate.

The DTI cap: what it means for high-income borrowers

The 6x DTI restriction (from February 2026) means that if your total debts exceed 6 times your gross annual income, you may be declined or pushed to a lender that still has capacity within its 20% DTI ≥6 allowance. For an earner on $100,000, DTI of 6 equals a maximum total debt of $600,000 — and that includes any existing debts (car loan, personal loan, credit card limits, HECS) plus the new mortgage. For an earner on $200,000, the ceiling is $1,200,000 in total debt.

In practice, the serviceability buffer usually bites before the DTI cap for lower and middle-income borrowers. The DTI cap matters more for high-income borrowers seeking large loans, or for borrowers carrying existing debt who add a mortgage on top. If you earn $150,000 but already have a $30,000 car loan and $40,000 in HECS, your existing debt is $70,000 — leaving $830,000 of DTI headroom for the mortgage (6 × $150,000 = $900,000 minus $70,000). A lender may also count credit card limits at their full limit for DTI purposes, not just the balance.

Strategies to increase your borrowing power under APRA rules

First, reduce or close unused credit cards. A $10,000 credit card limit with a zero balance is assessed as a $10,000 debt — and at a 8.5% assessment rate over the remaining loan term, it can reduce borrowing power by $30,000 or more. Close it before applying.

Second, run your specific numbers at the buffer rate, not the advertised rate. An Arrivau consultant can model your borrowing capacity across multiple lenders because assessment rate practices, HEM benchmarks and policy on specific income types (overtime, bonus, rental income) vary lender to lender. The 3% buffer is an APRA floor — some lenders apply an even more conservative assessment rate, while others shade more aggressively within the buffer.

Third, structure your application to present the cleanest income picture. Regular PAYG income with stable employment history is the strongest profile. If you are self-employed, have variable income or rely on investment income, the lender’s treatment of that income under the assessment rate can swing your borrowing power by tens of thousands of dollars.

Fourth, if your DTI is above 6, target lenders that have not yet reached their 20% cap for the month or quarter. The cap is a portfolio-level restriction that resets — not a permanent ban. A broker who monitors lender DTI appetite can time your application when a lender has capacity.

Information sources

All APRA rules in this article — the 3% serviceability buffer and the February 2026 DTI ≥6 restriction — are sourced from APRA public guidance and media releases as at July 2026. The buffer was confirmed at 3% in APRA’s May 2026 statement. Assessment-rate calculations are indicative; actual maximum borrowing varies by lender policy, product, LVR, property type and applicant circumstances.

Frequently asked questions

Will APRA reduce the 3% buffer if rates fall?

APRA has stated it will review the buffer if financial stability conditions change. As at May 2026, the buffer remains at 3%. A reduction would increase borrowing capacities across the market, but there is no announced timeline for a review.

Does the buffer apply to fixed-rate loans?

Yes. The buffer applies regardless of whether your loan is fixed, variable or split. The assessment rate is the product rate (including any fixed rate) plus 3 percentage points, or the lender’s floor rate if higher.

How is rental income treated under the buffer?

Lenders typically count 75–80% of gross rental income as assessable income, then apply the buffer to the investment loan. The treatment varies by lender. An investment property can improve or reduce your overall borrowing position depending on the rental yield and the buffer’s impact on the investment debt.

What counts toward the DTI cap?

Total debts include the proposed new mortgage, existing mortgages, personal loans, car loans, HECS/HELP debt, credit card limits (at the full limit, not the balance), and any other borrowings. Gross income includes base salary plus a percentage of overtime, bonus, commission and rental income depending on lender policy.

Next step: calculate your real borrowing power

APRA’s buffer and DTI rules interact with your specific income, expenses and debts in ways that a generic calculator cannot capture. Speak with an Arrivau licensed mortgage consultant — we can model your borrowing capacity across multiple lenders using your actual numbers and respond within one business day.

General information disclaimer

This article is general information only and is not personal financial, tax, legal or credit advice. APRA rules, lender policies and assessment rates can change. Arrivau Pty Ltd (ABN 81 643 901 599) provides credit assistance as an ASIC Credit Representative, CRN 530978. Consider your objectives, financial situation and needs, and seek licensed advice before making a loan application.