Hi liruzun,
In QuickBooks Online Payroll, the calculations would not be automatically applied. Although you can create a union deduction/contribution, you would need to calculate the vacation accrual to pay, then manually adjust the vacation balance each pay run. If you're uncertain as to how to proceed, I recommend speaking with an associate for their expertise.
If you would like to see this come available in future updates and feature enhancements, please don't hesitate to submit a suggestion to our Development Team.
Please don't hesitate to touch base with us again, should you have any other questions. We would be happy to assist!
