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I'm here to help edit payroll check in QuickBooks Online, @usermimiskitchencafe.
Editing a paycheck depends on what your payroll processing state is. If it's a manual paycheck, you can delete and recreate this using the additional taxes to be withheld.
Here's how to delete paychecks:
Intuit Online Payroll Enhanced/Intuit Online Payroll for Accountants
Intuit QuickBooks Online Payroll Enhanced
Once done, recreate the paycheck.
If this is a Direct deposit and still unprocessed, you also have the option to delete and recreate the paycheck. When it's already processed, I suggest contacting our support team for further assistance.
I've also added this article that can guide you print checks in QuickBooks Online: Printing Checks and Pay Stubs.