double tax treaty

Hi to all, Is there any jurisdiction which has a tax treaty with Portugal, but the dividends are exempt? In other words, I am looking for a jurisdiction to incorporate a company whose shareholders are tax residents in Portugal, and when it comes to distributing dividends, Portugal does not...

I'm wanting to register a company that will act as the main company while owning subsidiaries else where in US/Canada and Europe. I understand that those companies will have to pay their taxes but as long as I don't have a physical presents in Costa Rica, I will not. While not an offshore haven...

Now I learned how to setup a anonymous company and how to setup a company with fake docs. but I never learned how to setup a company with the benefit of using DTA! Does someone know how I legitimate can use DTA to avoid to pay tax in my home country? what requirements are there?