Welcome to the Community forum, d-stewart. Allow me to provide information about backdating a paycheck in QuickBooks Online.
If you are utilizing Payroll Core, it's important to note that backdating a paycheck isn't possible. However, if you're using Payroll Advance, you have the ability to backdate until the previous tax year.
Please be aware that if you need to backdate by more than a year for a payroll advance, or if you are using Payroll Core, it is best to contact our Support team. They will be able to process and enter the backdated paycheck for you.
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If you wish to access payroll reports to gain a better understanding of your business's financial status and your employees, you can refer to the following resources for future use: