I see no way such a UK/Estonia setup would work without substance in the country the company is registered in. Of course it may work in practice because nobody takes a closer look, but that doesn’t mean it’s legal.
Common sense should also tell you that if it was so easy to drastically reduce your Polish tax burden, everyone would do it that way.
Common sense should also tell you that if it was so easy to drastically reduce your Polish tax burden, everyone would do it that way.