Thanks everybody for your answers!

My yearly income will be in the low 20s.

Actually i am a Romanian citizen, and I am a contractor with the US based company.

Maybe this can help you in helping me further clarify my problem.

Also I was wondering if tax is payed at the whole amount or are there any deductions, like rent for example?

Thanks again guys, I am looking forward to your answer! And of course to moving to Spain

Best regards,
Marius