141EAShortfall penalty and provisional tax

1. Despite sections 141A to 141E, a provisional taxpayer who uses a GST ratio in a tax year to determine the amount of an instalment of provisional tax payable for the tax year is not liable to pay a shortfall penalty in the following circumstances:

2. the taxpayer pays by the instalment date the amount, determined using the GST ratio, of the instalment but underpays their annual liability:
3. the taxpayer pays by the instalment date the amount, determined using the GST ratio, of the instalment but the GST ratio is changed after the instalment date by a reassessment of their residual income tax.