Tax returns alternative

Hello,
I plan on applying for financial aid at several universities and I need to send (together with the CSS) the tax returns for my parents. Now, in my country (Romania) we don’t have tax returns so I must submit a letter from my employer.
My question is what format should the letter have and whether to use my local currency (RON) or dollars?

EDIT: I meant letter from my parents employer (i am not employed)

You should ask the schools what they require.