Setting different VAT per sub shop

Hello,
Thanks for your reply, I have been looking into this but still not working. Assume I am a UK customer visiting the UK site
Following your suggestions I set up a rule for General UK customer group - customers in Great Britain are charge 20% VAT

1 - After adding the product to the cart, the product price is correct 17.99; the tax charged is showing at 23% instead of 20% but I assume this is because user it’s not logged in yet
2 - I proceed to checkout and select Great Britain as my address
3 - Now the price breakdown is showing the correct VAT rate but the product price has changed
4 - Final step at checkout - the product price is 17.55 instead of 17.99 (Shopware understands that 17.99 is price of inclusive of 23% so now it calculates the net price and ads 20%, therefore, the prices is less)
5 - Still logged in, if I decide to abandon the checkout and go back to browsing the products, the prices are now showing inclusive of 20% VAT. They are lower than what want to charge our customers.

Kind regards