hard to know...two things to check
1) Go back to the charity donations section nd make sure every charity donation is correct. Occasionally, a person puts a comma instead of a decimal for the cents, and that comma results in a large number.
2) If you made a large donation last year, that exceeded the AGI limit for donations last year, you might have had some $$ carryover to this year's forms.
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Other than that, you'd need to make a printout of your tax return (actually, just a PDF file) from the Print Center, with all forms and worksheets, to find the various charity worksheets that recorded exactly what you entered...but #1 above should show where the problem occurred in most cases.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
