Deductions & credits

You'd probably have to print out the Schedule A to see where it's coming from.

 

Lines 5a-thru-5e of the Schedule A should show you where the excess is coming from.

 

IF line 5a is over 10k, then it is coming from State and local income taxes.

.....5b is for property taxes/real estate taxes

.....5c is for Personal Property taxes.

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If it's all from line 5a, then you'd need to get a look at the Tax Payments Worksheet to weasel out exactly what the sources were that caused the State/Local taxes to exceed 10k 

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*