If this has happened there's going to be some headaches and extra compliance to rectify, reconcile and recover the missing payments.
Your accountant may not pick up on the difference in tax payments until the end of the year - especially if you see them only once a year or you do your own GST returns.
If you want to check you can access this information online with the IRD.
If you do find yourself in a situation where the tax is underpaid then there are couple of things you can do.
For a start check with the business you worked for - it's possible there could be a genuine error - it does happen and it may be an easy fix.
If you're having no luck with any response then talk to your accountant about next steps for fixing this - it's possible they will have access to an account manager at IRD who can help.
Jeremy Tauri is an associate at Plus Chartered Accountants