Definitely a problem with turbotax program. I spoke with CRA agent & was very helpful in providing explanation of forms, etc.

@drewsj2 Make sure information on the T4 slip is properly entered. We also suggest do it in form mode directly, compare the amount in box 16 and line 44800, and then check schedule 8 to get a look at the calculation

Please refer to these links for more information: CPP contribution rates, maximums and exemptions

Contributions to the Québec Pension Plan