🇦🇺 Finance

Home Affordability Calculator Australia 2026

Find your maximum home purchase price using the APRA 3% serviceability buffer. Calculates borrowing power, LVR, LMI estimate and debt-to-income ratios to show exactly how much house you can afford.

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Max Purchase Price
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Max Loan Amount
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LVR
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Monthly Repayment
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Assessment Rate (APRA)
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LMI Estimate
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Front-End DTI
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Back-End DTI

How It Works

Australian lenders assess your borrowing power at your loan rate plus a 3% APRA buffer. This calculator finds the maximum home price where your repayments — at the assessment rate — stay within the standard 35% front-end and 45% back-end DTI benchmarks used by Australian banks.
  1. Assessment rate — Your entered rate plus 3% (APRA buffer). For example, 6.5% becomes 9.5% for serviceability testing.
  2. Max housing payment — The lower of: 35% of gross monthly income (front-end limit) minus rates/insurance, or 45% of gross monthly income minus all existing debts and rates/insurance (back-end limit).
  3. Binary search — Finds the highest purchase price where repayments at the assessment rate stay within both limits. Capped at 95% LVR (5% minimum deposit).
  4. LMI estimate — If LVR exceeds 80%, estimates Lenders Mortgage Insurance at 1%–3.5% of loan value depending on LVR band.
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Understanding Australian Home Affordability in 2026

With Australian property prices among the highest relative to income in the world, understanding exactly how much you can borrow is a critical first step before entering the market. The answer is more complex than simply multiplying your salary by a fixed number — Australian lenders apply an APRA-mandated serviceability buffer, check your debt-to-income ratios, and scrutinise your living expenses. This calculator models the key constraints so you can enter the market with a realistic budget in hand.

The APRA Serviceability Buffer

Since October 2021, APRA requires all authorised deposit-taking institutions (ADIs) — banks, credit unions and building societies — to assess borrowers' ability to repay at their actual interest rate plus a 3% buffer. This means if you apply for a loan at 6.5%, the lender must confirm you could still meet repayments if the rate rose to 9.5%. The buffer exists to ensure borrowers are not overextended if rates rise after settlement. It is the single biggest factor limiting borrowing power at current rate levels. With the RBA cash rate at 4.10% in early 2026, variable mortgage rates typically sit around 6–7%, meaning borrowers are assessed at 9–10% — significantly higher than the actual repayment rate.

LVR, LMI and the 20% Deposit Threshold

Your Loan-to-Value Ratio (LVR) is the loan amount divided by the property purchase price. Most lenders cap LVR at 95% — meaning you need at least a 5% deposit. However, borrowing above 80% LVR (less than 20% deposit) typically triggers Lenders Mortgage Insurance (LMI). LMI protects the lender if you default, but you pay the premium — usually 1%–3.5% of the loan amount depending on LVR. On a A$700,000 loan at 88% LVR, LMI could add A$14,000 to your costs. Some lenders offer LMI waivers for specific professions (doctors, lawyers, accountants) or government-backed schemes for eligible first-home buyers. See our Stamp Duty Calculator for the full upfront cost picture.

Debt-to-Income Ratios in Australia

Australian lenders typically apply informal DTI benchmarks as part of their serviceability assessment. While there is no formal government-set ratio system (unlike the Canadian GDS/TDS rules), the standard industry practice is approximately 35% front-end (housing costs as a share of gross income) and 45% back-end (all debt repayments combined). APRA also monitors system-wide DTI — in recent guidance it has flagged concern about loans exceeding 6× annual income, though this is a macro-prudential signal rather than a hard borrower limit. The most binding constraint at current rates is usually the APRA serviceability assessment itself, not the DTI ratio.

First Home Buyer Schemes

Eligible first-home buyers in Australia may access the First Home Guarantee (federal scheme), which allows buying with as little as 5% deposit without paying LMI — the government guarantees up to 15% of the loan value. Income and price caps apply and vary by state. States also offer stamp duty concessions or exemptions for first-home buyers: check your state's revenue office for current thresholds. The First Home Super Saver Scheme (FHSS) allows you to save up to A$15,000 per year (A$50,000 total) inside superannuation and withdraw it for a first-home deposit, benefiting from the lower super tax rate. For ongoing repayment affordability, also see our Australian Mortgage Calculator.

For informational purposes only. Borrowing capacity varies by lender and is subject to individual credit assessment, employment verification and responsible lending obligations. This calculator applies simplified DTI benchmarks and does not account for lender-specific living expense measures (HEM), credit history or loan product features. Consult a licensed mortgage broker (MFAA/FBAA member) or financial adviser before making property purchasing decisions.

Sources: APRA Prudential Practice Guide APG 223 (2021); Reserve Bank of Australia cash rate guidance; NHFIC First Home Guarantee scheme.

Frequently Asked Questions

What is the APRA serviceability buffer in Australia?
APRA requires lenders to assess your borrowing capacity at your actual loan rate plus a 3% buffer. For example, if you apply for a loan at 6.5%, the lender tests whether you could still afford repayments at 9.5%. This buffer protects borrowers from payment shock if interest rates rise after they take out the loan.
How much deposit do I need to buy a home in Australia?
Most lenders require a minimum 5% deposit (95% LVR). However, a deposit under 20% triggers Lenders Mortgage Insurance (LMI), which can add A$10,000–A$30,000+ to your costs. A 20% deposit avoids LMI and often unlocks lower interest rates. Eligible first-home buyers may access the First Home Guarantee to buy with 5% deposit without LMI.
What is LMI and when does it apply?
Lenders Mortgage Insurance (LMI) protects the lender — not you — if you default and the property sale does not cover the loan balance. It applies when your LVR exceeds 80% (deposit below 20%). LMI is typically capitalised into the loan and ranges from approximately 1% to 3.5% of the loan amount depending on LVR.
What is LVR and what does it mean for my mortgage?
LVR (Loan-to-Value Ratio) is your loan amount as a percentage of the property value. Buying an A$800,000 home with a A$160,000 deposit gives an LVR of 80%. A lower LVR means better interest rates and no LMI. Most lenders cap LVR at 95% for standard residential loans.
How do Australian banks assess borrowing power?
Lenders check that repayments at the APRA assessment rate (contract rate + 3%) do not exceed roughly 35% of gross income and all debts combined do not exceed 45%. They also review credit history, employment stability and living expenses via the Household Expenditure Measure (HEM). Each lender's model differs slightly — a mortgage broker can compare multiple lenders to find your highest borrowing capacity.
What upfront costs should I budget for when buying in Australia?
Beyond your deposit, budget for stamp duty (varies by state — see our Stamp Duty Calculator), conveyancing fees (A$1,500–A$3,000), building and pest inspection (A$500–A$1,000), loan application fees (A$0–A$800), LMI if applicable, and moving costs. Total upfront costs typically add 3–5% of the purchase price on top of your deposit.

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