QuickBooks sync creating duplicate invoices — how to prevent?

Question

We're seeing duplicate invoices in QuickBooks Online every time a work order syncs. Same customer, same line items, created within minutes of each other. My team can't move forward on month-end close until we fix this.

We're on the standard QuickBooks Online integration, syncing completed work orders only. Happening across multiple customers, not isolated.

What causes this and how do we stop it?

Priya Nair (Staff) · Accepted Answer

Happy to help here, Brandon! Once you've cleaned up those duplicate connections, I'd recommend: Run a manual sync on one test work order to confirm clean behavior Check your Audit Log (Settings → Account → Audit Log) to see which user/connection created the duplicates — helps prevent recurrence Consider enabling Sync Confirmation Emails temporarily so you catch any future duplicates immediately If you're still seeing duplicates after removing extra connections, open a ticket and we'll trace the specific work order IDs. The double webhook + scheduled sync scenario Eli mentioned is documented in this troubleshooting article.

Eli Torres (Staff) · Answer

Hey Brandon — Carlos is on the right track. Two things to check: 1. Duplicate connections Go to Settings → Integrations → QuickBooks and look for multiple authorized connections. If you see more than one, revoke all and reconnect once. We've seen this when someone reauthorizes after a password change without realizing the old token is still active. 2. Webhook + scheduled sync overlap If you have both "Sync on Status Change" enabled and a daily scheduled sync, they can race. The webhook fires immediately on completion, then the scheduled job picks up the same work order if the timing overlaps. Quick fix: disable scheduled sync if you're using real-time webhooks, or add a filter so scheduled sync only picks up work orders older than 1 hour. Can you check your integration settings and let us know what you see? Also — are the duplicates always back-to-back (same minute) or scattered throughout the day?