St George Bank Home Loan Calculator 2026 - Borrowing Power & Repayment Calculator
Calculate your St George Bank home loan borrowing power and estimate monthly repayments with our comprehensive Australian home loan calculator for 2026. This free tool helps prospective homebuyers, property investors, and refinancers understand their borrowing capacity, monthly repayments, and total loan costs based on current lending standards. Whether you're comparing St George Bank home loans or evaluating options across multiple Australian lenders, our calculator uses standard mortgage formulas and incorporates APRA's 2026 debt-to-income lending restrictions to provide realistic estimates aligned with current Australian banking regulations.
Home loan calculations in Australia involve complex formulas that determine how much you can borrow (borrowing power) and how much you'll pay each period (loan repayments). Australian banks including St George Bank, Commonwealth Bank, Westpac, ANZ, and NAB assess borrowing capacity using standardized serviceability calculations mandated by the Australian Prudential Regulation Authority (APRA). These assessments consider your income, existing debts, living expenses, dependents, and apply minimum interest rate buffers to ensure borrowers can service loans even if rates increase.
From February 2026, APRA's new debt-to-income (DTI) restrictions limit banks to issuing no more than 20% of new home loans at six times gross income or higher, affecting maximum borrowing capacity for high-income earners. Understanding these calculations helps you realistically assess what you can afford, compare lender offerings, and plan your property purchase or refinancing strategy with confidence based on current 2026 lending standards and regulatory requirements.
## Home Loan Calculator ToolsChoose Calculator Type
Calculate Your Borrowing Power
Calculate Loan Repayments
Check Affordability & DTI Ratio
Calculation Results
Australian home loan calculations use standard financial mathematics formulas that apply across all major lenders including St George Bank. Understanding these formulas helps you verify calculator results and comprehend how interest, principal, and repayment frequency affect your total loan cost.
Monthly Loan Repayment Formula (Principal & Interest):
\[ M = P \times \frac{r(1+r)^n}{(1+r)^n - 1} \]
Where:
- \(M\) = Monthly repayment amount
- \(P\) = Principal loan amount
- \(r\) = Monthly interest rate (annual rate ÷ 12)
- \(n\) = Total number of payments (years × 12)
Debt-to-Income (DTI) Ratio:
\[ \text{DTI Ratio} = \frac{\text{Total Loan Amount}}{\text{Gross Annual Income}} \]
APRA 2026 restriction: Maximum 20% of new loans can have DTI ≥ 6.0
Loan-to-Value Ratio (LVR):
\[ \text{LVR} = \frac{\text{Loan Amount}}{\text{Property Value}} \times 100\% \]
LVR > 80% typically requires Lenders Mortgage Insurance (LMI)
Total Interest Paid Over Loan Term:
\[ \text{Total Interest} = (M \times n) - P \]
Where \(M \times n\) is total repayments and \(P\) is principal borrowed
https://moneysmart.gov.au/home-loans/mortgage-calculator
The Australian Securities and Investments Commission (ASIC) provides MoneySmart, the Australian government's official financial guidance website offering free, impartial mortgage calculators and home loan information. The MoneySmart mortgage calculator helps you compare different interest rates, loan terms, and repayment frequencies to understand total loan costs. It includes features to estimate borrowing capacity, compare scenarios side-by-side, and understand how extra repayments reduce interest charges and loan duration. ASIC is Australia's corporate, markets, and financial services regulator, ensuring the information provided is accurate, up-to-date with current lending practices, and aligned with consumer protection standards.
https://www.apra.gov.au/activation-of-debt-to-income-limits-as-a-macroprudential-policy-tool
The Australian Prudential Regulation Authority (APRA) announced in November 2025 the activation of debt-to-income (DTI) lending limits effective 1 February 2026. This macroprudential measure restricts authorised deposit-taking institutions (ADIs) including St George Bank, Commonwealth Bank, Westpac, ANZ, and NAB to issuing no more than 20% of new owner-occupier and investment home loans at DTI ratios of six times gross annual income or higher. The limit applies separately to owner-occupier and investor lending portfolios and is measured quarterly. APRA implemented this pre-emptive measure to contain potential housing market risks from high DTI lending, particularly to property investors, and strengthen banking and household sector resilience before risks materially build up.
https://www.finance.gov.au/government/australian-government-investment-funds/housing-australia-future-fund
The Housing Australia Future Fund (HAFF) is a $10 billion dedicated investment vehicle established by the Australian Government on 1 November 2023 to support and increase social and affordable housing. From 1 July 2024, the Finance Minister transfers $500 million annually from the HAFF to pay grants and loans relating to social housing, affordable housing, and acute housing needs. The December 2025 MYEFO announced an additional $10 billion over eight years to deliver up to 100,000 new homes reserved for first home buyers, with construction starting 2026-27. These initiatives aim to progress toward the government's target of 1.2 million new homes by June 2029.
Scenario: Single applicant, $100,000 income, $3,000 monthly expenses, $100,000 deposit
Serviceability calculation at 6.5% + 3% buffer = 9.5%:
Monthly income available: $100,000 ÷ 12 - $3,000 = $5,333
Maximum monthly repayment at 30% serviceability ratio: $5,333 × 0.30 = $1,600
Using repayment formula at 9.5% over 30 years: \[ P = \frac{M \times [(1+r)^n - 1]}{r(1+r)^n} = \frac{1600 \times [(1+0.007917)^{360} - 1]}{0.007917(1+0.007917)^{360}} \]
Estimated Borrowing Power: ~$190,000 (plus $100,000 deposit = $290,000 purchase price)
DTI Ratio: 190,000 ÷ 100,000 = 1.9 (well within APRA limits)
Scenario: $500,000 loan at 6.5% p.a. over 30 years, P&I repayments
\[ M = 500,000 \times \frac{0.005417(1+0.005417)^{360}}{(1+0.005417)^{360} - 1} \]
\[ M = 500,000 \times \frac{0.005417 \times 7.0381}{7.0381 - 1} = 500,000 \times 0.006321 = \$3,160 \]
Monthly Repayment: $3,160
Total Repayments: $3,160 × 360 = $1,137,600
Total Interest: $1,137,600 - $500,000 = $637,600
Over 30 years, you pay $637,600 in interest—127% of the original loan amount
Scenario: $700,000 property purchase with $100,000 deposit
\[ \text{Loan Amount} = \$700,000 - \$100,000 = \$600,000 \]
\[ \text{LVR} = \frac{600,000}{700,000} \times 100\% = 85.7\% \]
LVR: 85.7% (exceeds 80% threshold)
LMI Required: Yes, estimated $15,000-$25,000 depending on lender
Alternative: Increase deposit to $140,000 for 80% LVR ($560,000 loan) to avoid LMI
St George Bank, part of Westpac Banking Group, offers various home loan products with competitive interest rates and features. When comparing home loans, consider not just the interest rate but also fees, features, and flexibility that affect total loan cost and convenience.
- Interest Rates: Fixed vs variable, comparison rate (includes fees)
- Fees: Application fees, annual fees, discharge fees, break costs
- Features: Offset accounts, redraw facility, extra repayments allowed
- LVR Requirements: Maximum lending ratio, LMI costs at different LVRs
- Loan Type Flexibility: Principal & interest, interest-only options, split loans
- Repayment Flexibility: Weekly, fortnightly, monthly options
- Portability: Can you transfer the loan to a new property?
- Customer Service: Branch access, online banking, app functionality
| Loan Type | Variable Rate Range | Fixed Rate Range (3 years) |
|---|---|---|
| Owner-Occupier P&I | 6.00% - 6.50% | 5.70% - 6.20% |
| Owner-Occupier IO | 6.30% - 6.80% | 6.00% - 6.50% |
| Investment P&I | 6.20% - 6.70% | 5.90% - 6.40% |
| Investment IO | 6.50% - 7.00% | 6.20% - 6.70% |
Understanding your borrowing capacity and loan repayments before committing to a property purchase is crucial for financial wellbeing and avoiding mortgage stress. Accurate calculations help you set realistic property price expectations, budget for ongoing costs including rates, insurance, and maintenance, and ensure you maintain comfortable lifestyle quality while servicing your mortgage. Over-committing to a loan that stretches your finances leaves no buffer for rate rises, unexpected expenses, or income disruptions.
Our home loan calculator provides estimates based on standard Australian lending formulas and incorporates current 2026 APRA regulations including the new debt-to-income restrictions. While these calculations give you valuable guidance for initial planning, remember that actual loan approvals depend on comprehensive assessment by lenders who verify your income, expenses, debts, and credit history. Always obtain formal pre-approval from St George Bank or your chosen lender before making property offers.
Ready to explore your borrowing options? Visit OmniCalculator.space for more free calculators including stamp duty calculators, mortgage offset calculators, and refinancing savings calculators to support your property purchase journey.
Disclaimer: This calculator and information are for educational and estimation purposes only. OmniCalculator.space is not affiliated with St George Bank or any financial institution. Results do not constitute financial advice, loan offers, or approval guarantees. Interest rates, lending criteria, and APRA regulations change frequently. Always verify current rates and eligibility directly with St George Bank or your chosen lender. Seek independent financial advice before making property or lending decisions.