John Doe has already filed his 2021 return. He provided you with the following information to calculate his installment payments: 

Year Taxes Payable Amounts Withheld 

2020 $56,000 $44,000 

2021 49,000 45,400 

2022 (Estimated) 65,000 47,000 

Requirement: 

1) calculate the amounts shown on the CRA's Instalment Reminder notices for 2022 and explain to John when the amounts are due; 

2) Advise John the best alternative for the instalment payment and when the amounts are due.