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It's a delight to assist you today, p_pearson.
QuickBooks Desktop allows you to easily manage your payroll items. Thus, you can make use of the Edit Payroll Item option which can be found in your Payroll Item List.
You'll want to use the net pay option on your payroll item for the deductions to calculate after tax. I'll walk you through the steps on how to do it:
I'll leave you with this article on editing payroll item for your reference.
You can always visit us again in the Community if you have other concern. Just leave me a reply below and I'll get back to you. Wishing you the best of luck!