In most cases, you should not need to adjust the numbers on your payroll tax
forms. QuickBooks exports your payroll data into the form. As long as your payroll
data is correct and up-to-date, your payroll tax forms should be complete when
you create them.
Special note about Form 941
Before you adjust numbers on your payroll tax forms, use the tax forms worksheets in Excel to see the detailed QuickBooks transactions that make up the amount in question.
If you need to adjust any numbers, you have two options:
QuickBooks strongly recommends that you make any adjustments to the source
data inside QuickBooks and start a new form.
If necessary, you can edit most fields in the form directly. For more,
see Editing payroll tax forms.