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Revolving Credit Mortgage NZ — How It Works and Who It Suits

Updated

A revolving credit mortgage is one of the most misunderstood — and potentially powerful — home loan structures available in New Zealand. Used correctly, it can save significant interest and help you pay off your mortgage years earlier. Used without discipline, it can cost more than a standard loan.

What Is a Revolving Credit Mortgage?

A revolving credit mortgage operates like a large overdraft. Instead of a standard repayment schedule, you have:

  • A credit limit (your total approved borrowing amount)
  • The ability to draw funds up to the limit as needed
  • No fixed repayment amount — you’re required to make minimum payments to ensure the balance doesn’t exceed the limit
  • Interest calculated daily on the outstanding balance

Because interest is charged daily on whatever balance is outstanding, depositing your income into the revolving credit account reduces the balance (and therefore the daily interest charge) for every day it sits there.

How It Saves Interest: The Core Mechanism

The magic of revolving credit is timing.

With a standard table loan, your salary arrives in your bank account. You pay rent/mortgage, bills, and living costs throughout the month, and whatever is left after all spending earns a modest savings rate.

With a revolving credit mortgage:

  1. Your salary (say, $5,000 net) is deposited into the revolving credit account
  2. Your mortgage balance drops from $600,000 to $595,000 on the day you’re paid
  3. Interest is charged daily — so the next 30 days of interest are calculated on $595,000 (or lower as you spend less than the balance)
  4. As you spend during the month, the balance gradually increases back toward $600,000
  5. The next payslip deposits again, reducing the balance again

The net effect: your mortgage balance averages lower than it would with a table loan, because your salary parks in the facility between spending cycles.

The saving: On a $600,000 revolving credit facility with an average salary of $6,000 sitting in the account for 25 of 30 days each month, the annual interest saving compared to a standard loan (assuming 7.0% floating rate) is approximately $3,500–$5,000/year.

This assumes disciplined spending and consistently leaving funds in the account rather than treating the available credit as spending money.

Revolving Credit Rate vs Fixed Rate

The core trade-off: revolving credit runs at the floating rate (currently ~7.00%–7.09%), while a fixed-rate table loan can be secured at significantly less (1-year fixed ~5.55% as at April 2026).

On a $600,000 balance, the 1.5% rate difference = $9,000/year in extra interest on a revolving credit compared to a 1-year fixed rate.

To benefit from revolving credit, your salary offset effect must exceed the rate premium. That requires:

  • A large enough balance sitting in the account on average
  • A large enough loan for the savings to be material

Rule of thumb: A revolving credit facility typically makes financial sense if you can consistently park at least $10,000–$20,000 in the account (through high income, low spending, or a combination), AND your loan balance is large (>$400,000). Below these thresholds, a fixed rate table loan will usually win.

Who Revolving Credit Suits

Well-suited to:

  • High earners with surplus cash flow who want to maximise the offset effect
  • Business owners or self-employed people with lumpy, variable income (deposit large amounts when payments come in)
  • People with a windfall or significant savings to park in the facility
  • Disciplined borrowers who treat the revolving credit as a mortgage, not a spending account
  • Borrowers who want maximum flexibility without formal repayment schedules

Not suited to:

  • Borrowers who may treat the available credit as spending money and draw it back down
  • Those with tight budgets who need a fixed repayment to maintain discipline
  • Borrowers where the floating rate premium significantly exceeds any offset benefit

The Discipline Risk

Revolving credit is sometimes marketed as automatically making you richer. In reality, the offset benefit only materialises if you leave money in the account and resist the temptation to spend up to the limit.

A borrower who starts with a $600,000 revolving credit limit and gradually increases the drawn balance over time because it feels like “available money” will pay significantly more in interest than they would on a standard table loan — with no fixed repayment discipline to force them to reduce the balance.

If you’re not certain you have the discipline to treat a revolving credit facility as a mortgage rather than an overdraft, a fixed-rate table loan is the safer structure.

Revolving Credit as Part of a Split Structure

The most practical way to use revolving credit for most NZ borrowers is as part of a split mortgage:

  • Fixed-rate table loan: 70–80% of the loan, at the lowest available fixed rate
  • Revolving credit facility: 20–30% of the loan, to absorb extra repayments and salary parking

This gives you rate certainty and discipline on the bulk of the debt, while allowing the revolving credit portion to benefit from offset and providing flexibility for lump-sum repayments.

ANZ FlexiHome, ASB Orbit, BNZ TotalMoney

Each major bank brands their revolving credit product differently:

  • ANZ: FlexiHome
  • ASB: Orbit Home Loan
  • BNZ: TotalMoney
  • Westpac: Choices Everyday
  • Kiwibank: Offset Home Loan (slightly different — a true offset against a separate savings account)

The Kiwibank offset is structurally different from revolving credit — your savings sit in a linked savings account and reduce the interest charged on the mortgage, but the mortgage balance doesn’t appear to change daily. The economic effect is similar but the mechanism differs.

Further Reading