QuickBooks Error 15276 typically occurs when there are issues with updating payroll tax table files. This error message indicates that the update did not complete successfully. To resolve this issue, you can try a few solutions such as restarting your computer, running QuickBooks as an administrator, and performing a clean installation of QuickBooks. Additionally, you can also check your internet connection and verify that your antivirus or firewall settings are not blocking QuickBooks updates. If the problem persists, it is advisable to reach out to QuickBooks support for further assistance.