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There are multiple reports you can run in your payroll account. One report you can run to check the hours to deduct is the Leave Balances report. Here's how:
Another area you can check is by going to the Employee details and click on Leave balances. Here's how to check:
You'll be able to see the leave taken and leave balance of the employee from there.
Feel free to reply on this thread if you have any other questions about QuickBooks Online. Have a nice day!