Setting up your employees for Payroll is a quick and straightforward process. QuickBooks Online walks you through the steps for setting up everything from your employee's TD1 form, to their tax deductions. I'd be happy to explain where you can enter this information.
The steps will vary depending on whether you're using Standard or Advanced Payroll, so I'll break that down for you below.
For Standard Payroll
When you add a new employee in the system, you'll be directed to a page titled "Get Ready for Payroll". On this page, you'll enter the employee's name, email, wage, TD1 information, vacation policy, and tax deductions.
To enter tax deductions for this employee, look at Question 5 - "Does this employee have any deductions? (Examples: retirement, health care)". Click the small pencil icon next to this question, then select the type of deduction/contribution. When you've entered all necessary information, select OK.