To add your expenses need to be more than 10% of your AGI unless you were born before 1952 in which case it would be 7.5%. At that pint it would be the amount above the percentage of your AGI. You can include premiums for insurance and medical expenses you paid. The easiest way to tell if your expenses were pretax or post tax is if your take home pay is 1,000 one week and next week it is 900 with a 100 insurance deduction than it is post tax.... either way still hard to meet the percentage for most people.... If you have an AGI of 50,000 and you have 6,000 in expenses than you will only benefit from 1,000....