How to change my employee's federal tax withholding from being zero in paychecks to a correct amount?

Thanks for taking the time to post here in the Community, turbohuffman.

My colleague, LeizylM, has already answered a similar question you've posted. You can view her answer through this link: https://quickbooks.intuit.com/learn-support/en-us/employees-and-payroll/re-payroll-did-not-take-out-federal-taxes/01/1026609#M90043, where she explained everything you need to know about changing your employee's federal tax withholding from zero in the paychecks to a correct amount.

Additionally, I've included an article that'll help you view useful information about your business and employees. This ensures your payroll data is correct: Run Payroll Reports.

Feel free to post again or leave a comment below if you have any additional concerns, turbohuffman. I'm more than willing to help. Have a good one!