To fix QuickBooks Desktop Payroll not working, first ensure that your QuickBooks Desktop and Payroll service are updated to the latest release, as outdated versions often cause payroll errors. Verify that your payroll subscription is active, check your internet connection, and confirm the correct service key is entered under Employees > My Payroll Service. You should also run the QuickBooks Tool Hub to fix program and payroll issues, and make sure your system date, time, and tax table are correct. If payroll still fails to process or update, call +1 (302) 205-4658 for expert QuickBooks payroll support and fast resolution.