Any chance we can get the source indicating that interest assessed for underpayment of a prior year's state income tax is not deductible? While I agree, the CPA says that this is wrong (i.e., he claims that the interest assessed and paid for underpayment of prior year state income taxes IS deductible). Would love to have a section of the IRC, and IRS Revenue Ruling, Instructions, or any other source to refer the CPA to!
