Goverment wich is basicly like business and they need to keep bookkeeping on every major funds incomes out-comes
so goverment want just know how much money you have and where you put  it.
just decalre your  money and thats it people make it worst if they try to hide it.
decalre your money and you sleep well !

and declaration dont mean you have to pay tax.
remember its all business and its all business for banks and goverment too.
dont hide your funds from goverment they will find out that and they will take it all from you:D andthen you cry...lol