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Refinancing / Loan Structure

How Much Can I Save by Refinancing My Home Loan?

The honest answer is: it depends on more than the rate.


The rate difference sets the ceiling on what's possible, but structure — and what you actually do with the savings — determines what you end up with.

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The Rate Difference Sets the Starting Point

On a $500,000 loan, a 0.50% rate reduction saves approximately $2,500 in interest in the first year, based on typical principal and interest repayments.

Over the full loan term, if that rate difference held steady, the total interest saved could run into the tens of thousands — though in practice, rates move over time, so this figure is illustrative rather than a guarantee.

How to Check Your Break-Even Point

Before the savings become real, refinancing costs need to be recovered first. A simple formula gives you a quick read on how long that takes:

Break-even point = total refinance costs ÷ monthly repayment saving

For example, if refinancing costs $800 and your new repayment is $200 a month lower, you break even in four months. Keep the loan beyond that point, and the saving is genuinely yours — sell, refinance again, or pay the loan out before then, and the switch may not have paid for itself. For the full cost breakdown to plug into this formula, see what refinancing actually costs.

Why Structure Often Outweighs the Rate Itself

Two borrowers refinancing to the exact same rate can end up in very different positions depending on how the loan is structured afterward. A genuine 100% offset account, an appropriate loan term (rather than automatically resetting to 30 years), and a deliberate decision to keep your repayment at the old, higher amount rather than dropping to the new minimum can all add up to considerably more total savings than the rate change alone.

For example, keeping your repayment unchanged after refinancing to a lower rate directs the difference straight at your principal — turning a rate saving into a shortened loan term and a larger total interest saving, rather than simply freeing up monthly cash flow.

Offset works the same way from a different angle: if you owe $500,000 and hold $40,000 in a genuine offset account, interest is calculated on $460,000 instead of the full balance — money sitting in your everyday account quietly reducing what you're charged, without you having to do anything extra each month.

The Honest Caveat

Refinancing delivers savings only if the freed-up cash flow is redirected with intent—into extra repayments, an offset account, or a clear investment or debt-reduction plan.

Simply banking a lower minimum repayment each month, without a plan for the difference, is still an improvement, but it's a smaller one than what the numbers on paper suggest is possible.

What Actually Determines Your Number

  • The size of the rate difference between your current loan and the new one.
  • Your remaining loan balance and term.
  • Whether the new loan includes a genuine 100% offset, and whether you use it.
  • Whether you maintain your previous repayment amount rather than dropping to the new minimum.
  • Refinancing costs, which reduce the net saving in the short term but rarely change the long-term picture.

See Your Actual Numbers, Not a Generic Estimate

A rough percentage rate difference only tells part of the story. A structure review looks at your specific loan, balance, and goals to show what refinancing could realistically achieve for you.

Read the Full Refinancing Guide
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