My invoice numbers have gone back so I would have duplicate invoices. How do I get them back in sync?

Hello there, cjhaggregate-yah. I understand the importance of getting your invoice number in sync. I'm here to share some details.

We can start by checking if the custom transaction numbers feature is not turned on, for it can be the reason for the arbitrary numbers on invoices. If that option wasn't enabled yet, I'll be glad to share some steps on how we can enable it. This option will let you enter any number or letter format on the invoice.

Here's how:
 

1. Click on the COG wheel icon.
2. Choose Account and Settings.
3. Select Sales, then press on anywhere within the Sales form content section.
4. Make sure that the box next to Custom transaction numbers is not checked.
5. Then, select Save and then Done.

However, if you already enable the custom transaction numbers feature, you'll need to edit the invoice number sequence you've customised.

To confirm that you made the adjustments to your account, you may also check the Audit log of your QuickBooks. I advise logging into your QuickBooks account in a private window if you want to make sure that no changes have been done to your account. You might be unable to access some feature of your account due to cookies and caches.

Then, make sure you're using the updated and supported browsers in QuickBooks. Here's an article for more details: Supported web browsers.

Once, the invoice numbers are now in sequence, you can go back to your regular browser and clear its cache. This way, you can open QuickBooks in a clean slate and prevent this hurdle from occurring.

I'll be adding the following articles for more details:
 

• Add custom transaction numbers to sales forms in QuickBooks Online
• Change the number on invoices or other transactions

Feel free to post a reply if you need more help in managing your invoices. I'll be around. Take care!