Hello there, @AcctnAsst.

I'm here to join the thread and help you handle your transactions/payroll correctly.

The reason why you don't have the Start Unscheduled Payroll option/button under the Pay Employees page is that you don't have the scheduled payroll created yet.

On the other hand, if you've created the check inside QuickBooks, then, I suggest following the steps provided by my colleague JaneD above. This helps ensure that the taxes are accurate on the form. To continue with the process, you just have to click on the Pay Employees button beside Start Scheduled Payroll.

For more information about creating paychecks in QuickBooks Desktop Payroll, you may check this article: Create paychecks.

Please don't hesitate to add a comment below if you have any other QuickBooks or payroll questions, I'll be around to help you. Have a great day ahead!