I worked for 8 months in France (as a contractor) where I get monthly fees (Tax free income based on a Tunisian-French tax treaty) in Euro and my monthly salary in Tunisia.
I was able after consulting the tax consultant to provide all the proof about the money I earned in France because of the online banking facilities, but for the Tunisian income during that year, it would be harder to request my account history for that year and get back those document here in Germany.
Does it really worth to prove how much I earned in Tunisia and would it get me a better tax refund? Thank you for your advice.