porteña said:"It depends on how complex your taxes are, if you have rental properties, investments, etc."
No, none of that, they should be easy except for the fact that I worked there till March and then here, and I think there was something with that... meaning, don't I have to tell them about my income in Argentina too, or can I forego it? I remember when I moved to the US, there was something to be done regarding that...
Welllllllllll - are you a US citizen? Legally you should declare and pay taxes on all your income. And if you already paid taxes in ARG on the income you earned here (assuming you were employed en blanco here), you are SOL since there is not a tax treaty and I don't think you would meet the qualifications to be exempt (you need to be out of the country for 330 days). Of course, I believe if you're an Arg resident, you should be paying taxes on your world-wide income as well (so the money you earned in the US).
I don't believe Turbotax can assist you with global tax issues (US only) so if you choose to declare your income in Arg, you would need to see an accountant. However, if you don't, Turbotax is a breeze and very easy to use.