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Does freedom to provide services allow me contracting in Germany without paying taxes there (but in my home EU country)?
You're free to provide services, but if you stay in one country for more than half a year - you're generally considered to be its resident for tax purposes. Germany is no exception to the rule, in fact - this is true to almost any country in the world. If you provide the services from Poland, and never set foot in Germany - they won't say a word.