When QuickBooks not calculating payroll taxes, it can be due to several reasons. Common issues include outdated tax tables, incorrect payroll settings, or improper employee information. This problem can result in inaccurate paychecks and potential compliance issues. To resolve this, ensure your QuickBooks software and payroll subscription are up to date, review and correct employee data, and verify that payroll settings are configured correctly. If issues persist, contact QuickBooks support for further assistance and troubleshooting. For persistent issues, consult QuickBooks support or a certified professional for assistance at 1.855.409.2300.