How do I (or can I) deduct additional state income tax paid in 2013 for my 2012 taxes?
For example, if I had $100 witheld in 2012 on my W-2 for state taxes but I owed $120 and then I paid the additional $20 in 2013 -- can I deduct that extra $20 paid in 2013 on my federal taxes? If so, how?
I need to enter it so it is deducted from my federal taxes but not counted toward my state taxes for 2013. How do I do that with HR Block's system?