return

If you chose the option to have your TurboTax fees paid from your federal refund, the refund amount would be decreased by the amount of the fees plus $40 for the refund processing service. Does that account for the reduction?

Also are you looking at the federal refund amount only or are you looking at the sum of the federal and state refunds. Federal and state are sent separately from two different tax authorities.

If these reasons do not explain the reduction, your refund was reduced by the IRS for some reason. It could have been a mistake you made or there may be an offset of part of your refund for some reason. See some of the reasons for offsets here: https://www.irs.gov/taxtopics/tc203