Calculator Assumptions

The purpose of this calculator is to help you see how much you could save over time or how long it will take to reach your savings goal based on the information you put into the calculator. The results are an estimate only. We have made a number of assumptions when producing the calculations. Our main assumptions are set out below:

Interest rates

We assume that the interest rates shown in the calculator are those which will apply to your account. We have to do this, as we don't know what the future will hold. Please remember though that all deposit account rates are subject to change, and you may not meet the eligibility criteria for (and so may not receive) any bonus rates shown for part or all of the calculation period.

Interest periods

We assume that interest is calculated and credited to your account monthly, with each month being exactly 30 days (some months are, of course, longer or shorter than this, and this will affect total interest calculations).

How you use your account

We assume that you make your regular savings payments to the account on the first day of each interest period, and that you do not make any withdrawals.


We haven't taken into account the tax you may need to pay on interest earned into your account. We have also assumed that you have quoted your Tax File Number (TFN), so that interest withholding tax isn't deducted from your interest payments.


We round monetary amounts up to the nearest dollar, and periods of time up to the nearest 1/10th of a year.

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