Can I sign my son's IL state tax return because he is in jail? I have power of attorney, can I sign it? Do I need to include any other forms with the return?

[KrisD]

Yes, file form 2848.

https://ttlc.intuit.com/replies/5638629

[KrisD]

IF you already filed form 2848, you don't need to file another one.

[ssttat]

That looks like a federal form. What about for my state tax form?

[KrisD]

If you have not been appointed as third-party designee or if you are required to perform acts beyond a third-party designation, you must be authorized as a taxpayer’s representative on Form IL-2848, Power of Attorney.
<a rel="nofollow" target="_blank" href="https://www2.illinois.gov/rev/taxprofessionals/pages/powerofattorney.aspx">https://www2.illinois.gov...>