Hello Svetlana,
It's great that you were on top of your payroll before the holidays and the CRA payroll calculator is a useful tool for working on your calculations outside of the QuickBooks Online Payroll system.
One thing to consider about why the numbers may be different is that the CRA released the updated payroll tax tables late December. Depending on when you did your calculations for the new year, the numbers you originally generated may have been using the 2019 tax tables for taxes and deductions.
I recommend reviewing the Governement of Canada's webpage about Payroll to learn more about changes that have been made. It goes over calculating deductions and has many other helpful pages in addition to that.
To make any corrections to your payroll in QuickBooks Online, I recommend contacting the QuickBooks Online tech support team. What we'll need to look at are things such as what payroll service you're using, whether you're using direct deposit, and other important details before moving forward with corrections. Here's how to contact us.
Phone and Chat: Click Contact Us to learn how to reach phone and chat support.
Schedule a Callback: click (?)Help in the upper right > click Contact Us > explain your situation > click Let's Talk > choose Get a callback (Note: Callback hours are the same as regular phone hours.)
Social Media: Facebook and Twitter from Monday to Friday between 9 a.m. and 8 p.m. ET
Don't hesitate to reach out! We're here to help. :)