If u r 40% handicapp (acc to govt doc) then u r elegible for 50,000 rebate under 80u. If u r more than 40% handicap than u r eligible for 1 lac ebate under 80u. Remember rebate under 80u is different than 80c.
Please remeber one more thing that handicap travel allowance is not a taxable income.
you r free to ask any income tax related question.