Quick answer: A lower rate is not automatically a cheaper refinance. Compare dollar savings over the period you expect to keep the new loan, subtract switching costs, and avoid extending debt merely to reduce repayments.
This guide answers one decision: Whether the savings from refinancing exceed costs and term-reset risk. The comparison should use the same amount, time horizon and purpose wherever possible. That prevents a lower repayment or headline rate from hiding a longer or less flexible structure.
Start with the decision, not the product
All are total-cost questions, not separate intents. The practical test is whether the structure improves total cost, liquidity, flexibility or future borrowing position enough to justify the trade-offs.
Decision framework
- Balance. Use the actual balance that will remain exposed, not the original loan amount.
- old/new rate. Compare the rate on the same balance and time horizon. A lower rate can still lose if the term or fees expand.
- remaining/new term. Use the period you genuinely expect the debt to remain outstanding. Term is a major driver of total interest.
- fees/cashback. Include establishment, discharge, package, line and ongoing fees that differ between options.
- holding period. Model the period you realistically expect to keep the structure before selling, refinancing or repaying.
- feature value. Put a dollar value only on features you will actually use, such as offset, redraw or flexible repayments.
Put the options on the same basis
| Compare | What to check |
|---|---|
| Amount | Use the amount that will actually be financed or removed from cash/offset. |
| Time | Compare over the period you genuinely expect the debt or facility to remain in place. |
| Cost | Include interest plus fees and any final balance, balloon or residual. |
| Liquidity | Show how much cash or working capital remains after the transaction. |
| Flexibility | Check early repayment, redraw, reviews, employer dependence or other exit constraints relevant to the product. |
Run the numbers: Refinance Break-Even Calculator uses a consistent set of assumptions so the result is not driven by mismatched terms.
Scenarios to test
$800k with 0.35% rate cut
Use $800k with 0.35% rate cut as a controlled comparison. Hold the transaction amount and time horizon constant, then compare cash retained, scheduled repayments, fees, total financing cost and any final balance. Change one assumption at a time so the real driver of the result is visible.
Small $180k balance
Use Small $180k balance as a controlled comparison. Hold the transaction amount and time horizon constant, then compare cash retained, scheduled repayments, fees, total financing cost and any final balance. Change one assumption at a time so the real driver of the result is visible.
30-year reset vs keeping remaining 18 years
For 30-year reset vs keeping remaining 18 years, start with the exact purpose and repayment source. Compare the alternatives on total cost, liquidity, security, documentation and what happens if the plan changes earlier than expected.
Questions borrowers are actually asking
When is refinancing actually worth it?
A lower rate is not automatically a cheaper refinance. Compare dollar savings over the period you expect to keep the new loan, subtract switching costs, and avoid extending debt merely to reduce repayments.
How much rate difference justifies refinancing?
There is no universal rate gap that makes a refinance worthwhile. The answer depends on balance, switching costs, remaining term and how long you will keep the new loan. Use dollar break-even rather than a percentage rule.
Does 0.20%, 0.25% or 0.50% justify switching?
There is no universal rate gap that makes a refinance worthwhile. The answer depends on balance, switching costs, remaining term and how long you will keep the new loan. Use dollar break-even rather than a percentage rule.
How do I calculate break-even?
A lower rate is not automatically a cheaper refinance. Compare dollar savings over the period you expect to keep the new loan, subtract switching costs, and avoid extending debt merely to reduce repayments.
Is refinancing worth it under $250k?
A lower rate is not automatically a cheaper refinance. Compare dollar savings over the period you expect to keep the new loan, subtract switching costs, and avoid extending debt merely to reduce repayments.
Should I reset to 30 years?
A longer term can lower the scheduled repayment while increasing the time interest is charged. Compare the new loan both at the proposed term and at the remaining term of the old loan.
What to have ready before comparing
- Current loan balance, rate, remaining term and repayment
- Any package, offset, annual, discharge and switching costs
- Property value estimate and existing limits
- Your expected holding period and near-term borrowing plans
Check whether refinancing stacks up
If you want the structure reviewed against the actual transaction rather than a generic product comparison, Check whether refinancing stacks up. An initial enquiry is not a lender application and does not itself trigger a lender credit enquiry.
Sources and verification
- Moneysmart — Switching home loans
- Moneysmart — Mortgage offset accounts
- APRA — Macroprudential policy settings
These sources support the general mechanics and decision framework. Product availability, pricing, fees and lender policy can change. Tax-sensitive decisions should be checked against current ATO guidance and, where appropriate, a qualified tax adviser or accountant.
Related GPS Finance resources
- Reprice or Refinance Your Home Loan?
- Offset vs Redraw: Which Is Better for Flexibility, Tax and Future Plans?
- Fixed, Variable or Split Home Loan? Structure the Loan Around Your Cash Flow
- Finance options
- Refinance Break-Even Calculator
About the author: KK Neelamraju is a finance and credit professional and founder of GPS Finance Group.
General information only. It is not personal financial, tax or legal advice. Finance approval, pricing, terms and structure are subject to lender assessment and the borrower’s circumstances.
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