Thank you for sharing your concerns and suggestions surrounding the upcoming tax law changes happening on July 1st.
Royal Mail have recommended a company called Taxamo assure which acts as a IOSS. They calculate and charge the customer VAT and pay it to the EU on our behalf without us having to fill in the VAT return. They charge £2 for each transaction. It sounds like the perfect solution but unless you are a shopify plus business one cannot get access to the Shopify checkout and do the API integration. The irony is if you are a shopify plus customer you will be big enough and it will be more cost effective to set up your own IOSS.
I understand that in order to use the recommended service for this app that you need to access the checkout API and that is restricted for non plus stores. You are correct, that would be the case if that is the requirements of using this service. I can see how beneficial it would be to have that ability to integrate an app like that or for Shopify to have that feature available as standard. I have shared your feedback to our development team but there is no current timeline for something like that specifically.
To clarify, and to make sure that I fully understand the specific feature you are wanting this to add into your store: The Taxamo Assure service provides a way to track and report your VAT tax per order in one easy way, saving you the time of having to manually calculate and report yourself?
Also, to clarify one of the terms being used here, IOSS is specifically for non-EU merchants whereas OSS is for merchants located in the EU.
While I am not a tax expert, I definitely want to assist with any additional questions you or other merchants have. To best help me help you, if anyone has questions if you can ask as a clear question + ideal solution that will help me get the context and information you need!
Thank you!
-Shay