Hi,

In your case, you want receipts and invoices in Odoo POS to behave differently with VAT. When customers pay in cash and get a receipt, you don’t want VAT to be reported in accounting, even though the product price includes it. But when customers pay by card and receive an invoice, the 21% VAT must be applied and reflected in tax reports. Right now, both receipts and invoices are recording VAT, which doubles your reported tax.

The cleanest way to fix this is by using fiscal positions. You can set up one fiscal position with 21% VAT for invoices and another with 0% VAT for receipts. In your POS configuration, set the 0% fiscal position as default so that receipts won’t generate VAT in accounting. Then, when you issue an invoice from the POS, Odoo will automatically switch to the normal 21% fiscal position, ensuring that only invoiced sales create VAT entries.

Another option is to run two separate POS sessions, one configured for 0% VAT (receipts) and one for 21% VAT (invoices). A more advanced approach is to customize POS logic so that it automatically applies 0% VAT for receipts and 21% VAT for invoices in the same POS session. Whichever method you choose, the result is that accounting reports will only show VAT from invoices, which ensures you pay the correct amount of tax to the government.

For more reference:

* https://www.cybrosys.com/blog/how-to-configure-taxes-in-odoo-17-pos

* https://www.youtube.com/watch?v=Pk5D_40CW80

Hope it helps

I also want solution for it if you found any please share!