Tax returns for CSS Profile

From Vietnam
My parents do not have to pay tax (they still have tax numbers) so do they have to file tax returns for the CSS Profile?

Are your parents American citizens?

Or USPsrmanent residents?

Are they currently living in the US. How do they support themselves

What instructions were you given by the college?

No my parents are Vietnam citizens, I know this questioon seems irrelevant, just want to make sure that tax returns are not compulsory

I have the same issue. My parents and I are not US citizens or residents, and they do not file taxes. So are tax returns not compulsory?

If your parents make under the minimum amount they can just file a declaration that they will not need to file.

I found out that it is indeed optional (at least for Intl’ Students) #:-S