Can you detail how you turned on tax for all areas ?? I am having this same problem. It was on there when I sent the invoice, but then when they paid it, it didn't charge them tax..... hum.... can you help.
Depending on where you're based it is a little bit different. Shopify has a guide for how to set up taxes for all regions here. Could the order have come from a different country or area where tax is different by any chance?
Nick | Community Moderator @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog