Adjusting the amount of your employee's salary is easy peasy. To do so, you can go to the employee's profile and change the salary from there. Here's how:
Sign in to your QuickBooks Online (QBO) account.
Click Payroll from the left menu, then select Employees.
Choose the employee you want to change the salary.
Go to the How much do you pay [employee name]? section, then adjust the salary of the employee.