When Should You Refinance Your Mortgage in NZ?

Three Moments Worth Checking

For most NZ borrowers, refinancing is worth considering at three moments: when your fixed rate term is expiring, when rates at other banks have moved materially lower, or when a change in life circumstances means your current loan structure no longer fits.

a white percentage sign painted on a brick wall

Your fixed term expiring is the easiest trigger to act on — there are no break fees involved, so it's the ideal moment to shop the market rather than simply accepting your bank's rollover rate.

Fixed Term Ending

No break fees apply, making it the lowest-friction time to compare the market.

Rates Have Moved

Another lender is offering materially lower rates for your borrower profile.

Life Has Changed

Marriage, kids, or a change in income may mean your loan structure no longer fits.

Equity Has Grown

Rising property value may let you refinance to access equity for other goals.

If your break-even period on the cost of switching is under 18 months and your plans are stable, refinancing is usually worth serious consideration.

Work through these before committing either way.

Calculate the break-even point

Compare switching costs against the interest you'd save to see how long it takes to pay off.

Check for break fees

If you're still in a fixed term, ask your current bank what breaking early would cost.

Compare more than the headline rate

Factor in cashback, fees and loan structure, not just the advertised interest rate.

Quick Summary

Best time: when your fixed term is expiring — no break fees apply.
Other triggers: a materially better rate elsewhere, or a life change.
Rule of thumb: worth it if the break-even period is under 18 months.