When I email an invoice, my clients receive two copies of it one after the other. Why is this ?

Hello there, billing91.

It's possible that the invoice is a recurring transaction or the duplicate invoice sent is caused by a browser-related issue. 

To start troubleshooting, you can try checking your Audit log if the email was sent twice. If not, you can look into the Recurring transactions page if the invoice is currently in use. 

Here's how:

1. Click the Gear icon and select Recurring transactions.
2. Look for a possible template that have the same details as the sent invoice.
3. From the list, click the dropdown arrow under the ACTION column.
4. Click Delete and select Yes to confirm.

If the invoices weren't accidentally sent twice or is not a recurring transaction, you can use a private browser in creating and sending your invoices. You can switch back to the main browser and clear the cache. You can use other supported browsers to isolate the issue.

Feel free to use this link that will you manage your invoices: Customise invoices, estimates, and sales receipts in QuickBooks Online.

Need more help sending invoices to your clients? You're always welcome to tag me in your reply. I'll be here ready to back you up!