How do I declare additional taxes paid for 2005 in 2006?

Question

After filing my 2005 tax return the IRS said I owed an additional $699.37 taxes which I paid. How do I declare this additional amount on my 2006 taxes?

Answer 1

You can not deduct or claim Federal Taxes that you paid for Prior years on the current year tax return, Federal Taxes are not deductible at anytime

Answer 2

You don't. Federal taxes do not enjoy tax relief as a rule. Now, if you also paid any additional state income tax, you can add that to tax withheld and include it on Schedule A if you itemize.

Edit: Rob is wrong. One half of Self-employment tax is deductible as an above-the-line deduction, so if the extra tax was from self-employment income and you did not account for it, you can deduct the SE tax part.