Thank you very much for your recipe to find the answer but I still don't know how to follow the recipe. The Czech-US tax treaty has a lot of words about residency
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that don't seem to have anything to do with the presence in one country or another, and I don't know what it means in my case and whether the word "resident" means the same in all contexts and whether it holds for the same year or its part- simply I still don't understand anything. On the other hand, this page seems to say that Massachusetts recognizes all federal treaties:
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That's pretty scary that I would have to hire a tax expert even though I did nothing special whatsoever. It is all so overwhelming that it seems more acceptable to ignore the tax return (and refunds) altogether and sit in the prison if necessary because it is still better than several months of huge nerves and uncertainty which is what you indicate. Thanks anyway Lubos
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