Serviceability Calculator
Estimate borrowing power based on income, expenses, debts, and assessment rate.
SECTION 0: Quick Actions
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Reset to Defaults
Copy Results
Copy Results includes a clean summary (assessable income, expenses, debts, assessment rate, borrowing power).
SECTION 1: Income (Gross / Assessable)
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Base Salary/Wages (annual)
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Bonus/Overtime (annual)
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Bonus assessable % (default 80%)
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Rental Income (annual)
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Rental expenses (annual)
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Rental assessable % (default 75%)
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Other Income (annual)
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SECTION 2: Household & Living Expenses
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Household size
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1
2
3
4
5+
Lifestyle (benchmark)
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Basic
Medium
High
Living expense mode
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Manual living expenses
Benchmark estimate
Manual living expenses ($/month)
Benchmark monthly (read-only)
SECTION 3: Existing Debts & Commitments (Monthly)
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Existing mortgage/loan repayments ($/month)
Car loan ($/month)
Personal loans ($/month)
Student/HECS ($/month)
Child support/alimony ($/month)
Credit card limit ($)
CC assessed repayment % (default 3% / month)
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SECTION 4: New Loan Settings (Borrowing Power)
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Loan type
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P&I
Interest Only
Assessment term (years)
IO term (years)
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Actual interest rate (%)
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Buffer (%)
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Floor rate (%)
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SECTION 5: Serviceability Controls
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Surplus usage factor (%)
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Minimum monthly buffer leftover ($)
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SECTION 6: What-If Scenarios
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Rates +1%
Expenses +$500
Income +$10k
These apply instantly and appear in the Scenario chart + PDF scenario table.
Comfortable
Assessable Monthly Income
AUD 0
Monthly Living Expenses
AUD 0
Monthly Existing Commitments (incl. assessed CC)
AUD 0
Monthly Surplus
AUD 0
Affordable New Repayment (after usage factor)
AUD 0
Estimated Borrowing Power (Max Loan Amount)
AUD 0
Warning: Surplus is low/negative. Borrowing power may be limited.
Assessment rate
0.00%
Usage factor
0%
Estimated max repayment/month
AUD 0
Borrowing power (P&I)
AUD 0
Borrowing power (IO)
AUD 0
IO payment estimate (assessment rate)
AUD 0
Pass/Fail note:
Comfortable
Breakdown (Formulas)
assessableIncomeMonthly
= assessableAnnual / 12
assessableAnnual
= baseSalary + bonus × bonusAssessable% + max(0, rentalIncome − rentalExpenses) × rentalAssessable% + otherIncome
expensesMonthly
= manualExpensesMonthly OR benchmark(householdSize, lifestyle)
assessedCC
= creditCardLimit × (ccAssessPct / 100)
commitmentsMonthly
= existingLoans + car + personal + HECS + childSupport + assessedCC
surplus
= income − expenses − commitments
affordableRepayment
= max(0, surplus × usageFactor) (and reduced if minimum leftover buffer is set)
assessmentRate
= max(actualRate + buffer, floor)
borrowingPower (P&I)
: principal = M × ((1+r)^n − 1) / (r × (1+r)^n), where r = assessmentRate/12 and n = termYears×12
Charts
Budget Breakdown
Borrowing Power Sensitivity
Scenario Results
Recommendations
Disclaimer:
Estimates only; lenders vary.
PDF Export
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