• Deduction is allowed for a dependant of the taxpayer and not the taxpayer himself.
• The taxpayer is not allowed this deduction if the dependant has claimed a deduction under section 80U for himself/herself.
• Dependant in case of an individual taxpayer means spouse, children, parents, brothers & sisters of the taxpayer. In case of a HUF means a member of the HUF.
• The taxpayer has incurred expenses for medical treatment (including nursing), training & rehabilitation of the differently abled dependant or the taxpayer may have deposited in a scheme of LIC or another insurer for maintenance of the dependant
• Disability of the dependant is not less than 40%.
• Disability is as defined under section 2(i) of the Persons of Disabilities Act, 1995

When the above conditions are met amount of deduction allowed is –

• Rs 75,000 (Starting from the financial year 2015-16) where disability is more than 40% and less than 80%
• Rs 1,25,000 (Starting from the financial year 2015-16) where disability is more than 80%
• These deductions are allowed irrespective of your actual expenditure.

Do note that before the Financial Year(FY) 2015-16 (FY 2014-15 & earlier years) – The deduction limit was of Rs 50,000 for disability at least 40%  and Rs 1,00,000 for disability above 80%.