New Zealand Law
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Under the Tax Administration Act, Inland Revenue can go back at least 10 years to review payments which you may have made. Unfortunately this means that they do have the power to go back to this tax period. You can ask them and challenge the assessment. You can also ask for penalties and interest to be waived if you acted relying on the original assessment being correct. If you are self-employed you would need to file the IR3 form.
If IRD have made mistakes you should tell them and ask for the penalties and interest to be waived. Did you have income other than from a job, such as investments?
Did you file any tax return at all? Did you have a job or where you unemployed?
This form explains how to apply for remissions, which you should do in this case