Methodology · AU-HOME-007
Rate Change Calculator
See how a rate rise or cut changes your mortgage repayment and lifetime interest, under keep-repayment or recalculate-to-term policies.
Engines and formulas
- E07 · Scheduled mortgage ledger
A payment-period ledger with dated events (rates, extras, offsets, fees), §13.9 offset treatment and §12.5.8 reconciliation invariants on every period. Daily accrual is not modelled at P0.
Registered formulas: §13.7 recurrence · §13.9 offset
Verification
Engines carry boundary tests at every bracket edge, property-based tests, reconciliation invariants and, where official worked examples exist, tests that reproduce them exactly. The full source register is on the sources page.