I just received a state notice of individual income tax adjustment. My refund was smaller to correct my mistake of entering the wrong amount in estimating taxes paid. I feel like I should be proactive and amend the fed return to correct my mistake (wrong figure in estimating tax paid - ugh, yes I did it twice) because now I owe them. Am I right to amend without a notice from the IRS? Do I need to amend the state even thou they have resolved the problem for me?