1- You only use the amended information slip as it replaces the first one.
2- Because you have an amount in each box 14 and box 16, you need an amount in each of 21 and 23
3- This means that you either have to call the CPP people at 1-800-277-9914 to find out how many months of disability or retirement you have received or you can verify your bank account to see when the amounts changed and enter the number of months for each. You may even be able to view the amounts through your MSCA (My Service Canada Account) if you have one.
4- The number in box 21 and box 23 cannot add to more than 12 months.
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