Having issue with invoice numbers atm Been fine for years but now it won’t automatically assign a number and if i use one higher then the last invoice number it says used

Good to see you here, dvs_tuning. 

I want to ensure you're able to use the correct number when creating an invoice.

We can perform basic troubleshooting steps to resolve it. You can start by accessing QuickBooks on a private window. This will help us check if you’re having a browser-related issue. 

These are the shortcut keys to open a private window for your browser:

• Google Chrome and Microsoft Edge - press CTRL + Shift + N.
• Mozilla Firefox - press CTRL + Shift + P.
• Safari for Mac - press Command + Shift + N

 If it works fine, go back to the regular browser and clear the cache. Too much cache can cause unusual browser behavior.

For future reference, here's an article that will guide you on how to receive payment in QuickBooks: Record An Invoice Payment.

Just in case you want to add custom fields to invoices, feel free to check out this article for the detailed steps and information: How to add custom fields to invoices.

You can always tag me in your reply if you have other concerns managing invoices. I'll be around to help you out. Keep safe!