Many QuickBooks users face issues when payroll refuses to run, often due to common errors like Payroll Error 80029C4A, Error 40001, or Error 101. These problems usually occur because of damaged program files, outdated QuickBooks versions, incorrect payroll setup, or interrupted updates. In most cases, updating QuickBooks, verifying payroll subscriptions, and running the software as an administrator can help. Network or firewall restrictions may also block payroll services. If the issue continues and payroll deadlines are approaching, it’s best to call QuickBooks Payroll Support at 1-888-394-9046 for expert troubleshooting and fast resolution.