My son is 5 and has a diagnosis of autism. The criteria for this credit is that your child will be deemed permanently incapacitated beyond the age of 18 and therefore it would be deemed that they would not be able to maintain themselves past the age of 18. It is a tax credit of 3,300. In order to receive it you must have a letter from gp stating that the above is their opinion . I applied for this for my son approx 2 years ago and received it. We have had intensive intervention since then and a lot has changed for the better in the last two years so much so that I am not happy claiming this credit anymore . It was applied for at the time in complete honesty as that was truly the position at the time . Can anyone advise me what to do ? Do I just cancel the credit ? Would I have to pay it back? ( although as stated while claiming I 100% was happy with this , certain changes in my ds are now making me reconsider ) any advice appreciated . Thank you .