15% taxes from monthly salary


I'm an expat returning back to Europe. I would like to know if there's any paperwork I need to fill out, in order to justify in  my country that I have been paying 15% taxes while working here in SEZ.

Or do I need to go through any other formality? This is my first time working abroad, and I don't know if they will ask me to pay taxes back in my country again...

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