Turbo Tax Standard is computing CPP premiums on self employment earnings income incorrectly. Should be about 9.9% of T4A earnings but is calculation almost double. Why?

Ensure that your income hasn't been entered twice. A common error for self-employed T4A holders is to enter the income in the self-employed section as well as entering the T4A.

Check the Schedule 8 for the calculation of your CPP contributions payable on Self-employment income.