Introduction You are still running QuickBooks Desktop 2021. It may have worked without major issues for years. But there is one critical fact you need to know: QuickBooks Desktop 2021 reached its end of support on May 31, 2024 . That means since that date, your QuickBooks 2021 no longer receives payroll tax table updates, bank feed connectivity, security patches, or technical support. If your business runs payroll, QuickBooks 2021 can no longer c...