When a QuickBooks payroll update fails with PS077, first verify that your payroll subscription is active and your QuickBooks Desktop version is updated. Check your internet connection and make sure the computer’s date and time are correct. Close QuickBooks, reopen it, and try downloading the latest payroll tax table again. If PS077 continues, check whether firewall or security settings are blocking the update and use QuickBooks troubleshooting tools to repair update-related issues. For guidance with QuickBooks error PS077, call +1(866)-513-4656 for assistance.