Thank you, @Oblotzky! I have added your store to the feature request.
Hello @Aria. I came across this checkout script example in the Shopify Manual:
This script is designed to achieve PRECISELY what all those on this thread are asking for, and has clearly been created to help Shopify users who have this problem. Unfortunately it can only be used by those on the Shopify Plus plan, as only this plan provides the ability to modify the checkout. If your developers were to include this script in standard Shopify, able to be invoked by a setting, it would solve everyone's problem!
The fact that this has been an outstanding issue for at least the seven years we've been using Shopify, with loads of EU customers screaming about in on various threads in the Shopify Community, plus the fact that as ever no-one is able to give any kind of indication as to whether and when it might be solved, suggests that your developers think it's a big deal to revise the tax functionality in Shopify to solve it. This script is yet another illustration that a solution could be provided VERY easily if the developers get out of their "this is a big deal" mindset and get into workaround rather than redevelopment mode. Otherwise we'll still be screaming in 10 years - or will have moved to another platform.
PLEASE talk to them again