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Interest-free deal calculator

Pay it off on time and avoid high interest rates

Page reading time: 5 minutes

Helps you work out:

For more information see disclaimer and assumptions and FAQs below.

Only get an interest-free deal if you:

  • can pay more than the minimum each month
  • are familiar with how to budget for repayments
  • can afford the higher repayment shown using this calculator

An interest-free deal might not be a good idea if you:

  • can only make the minimum repayments
  • have other ways to pay (for example, savings or lay-by)
  • have other debts you are struggling to pay off

Disclaimer and assumptions


It is an estimate only. Results will depend on the accuracy of your inputs.


  • Fees: this calculator does not include additional fees such as late payment fees.
  • Amount: the total amount of the loan deal, which may include extras such as extended warranty or delivery charges.
  • Additional purchases on your card: the first time you apply for an interest-free deal you may be issued with a credit card. This calculator does not take into account any credit card purchases. It does not support multiple interest-free deals.
  • Repayments: we have assumed repayments will be made monthly. Payments made more frequently may attract additional payment processing fees, if applicable.

FAQs - frequently asked questions

Q: Why is the calculated repayment more than the amount the lender has quoted?

A: Lenders will tell you what your minimum repayment is, calculated as a percentage of the closing balance. If you only make the minimum repayments, you will not repay the total amount you borrow within the interest-free period. The lender will then charge a very high interest rate on the balance you owe at the end of the interest-free period. This calculator tells you how much you need to repay each month to pay off your balance within the interest-free period.

Q: Can I make extra repayments if I want to?

A: Check your credit contract, but you can usually repay higher amounts or make extra repayments without penalty.