Hoani has derived the following income in the 2020 (2019-2020) income tax year:

His balance date is 31 March

Net income from forestry business $53,000

Dividend from Shotover Jet $4,500

Dividend from Amazon USA $2,500

Interest from ASB $5,700

Notes:

(1) The dividend from Shotover Jet includes an imputation credit of $1,200 and resident withholding tax of $300.

(2) The dividend from Amazon.com includes USA non-resident withholding tax of NZ$450.

(3) The interest from ASB includes resident withholding tax of $546.

Required

1) Calculate Hoanis provisional tax payments for the 2021 (2020-2021) income tax year

2) During the 2021 income tax year, one of Hoanis forestry business clients closes down business in New Zealand. He estimates that his income will be greatly reduced. Can he alter his provisional tax payments for the second and third instalment? If so, under what conditions?