How do I reset the auto generated invoice number? It has skipped a number and although I change it, it continues to skip ahead one number when creating new invoice

Hello dmckjones,

You can turn on the Custom transaction numbers feature to change the invoice numbers on your invoices. That way, you can enter the starting invoice number, and then QuickBooks Online will sequence your invoice number based on the number you entered on the invoice no field.

Here's hot to turn on Custom invoice number:

1. Click on the Gear Icon.
2. Click on Account and Settings.
3. Click on Sales tab, and then select Sales form content section.
4. Tick box for Custom transaction number.
5. Click on Save, and then Done.

Then, open one of your Invoices or sales forms, and then in the Invoice no. field, enter the invoice number that's skipped. Please note that the sequence you enter in the Invoice no. field applies to all sales forms in QuickBooks Online. 

To learn more about invoice numbers, please check this article: How to set up custom invoice numbers [Video]

Feel free to comment below if you need more help with QuickBooks Online. Have a great day!