You can't deduct registration fees unless part of the fee represents a tax based on the value of the vehicle, and if that is the case, you can only deduct that part of the fee. You can't deduct fees for plates, your title, or the privilege of driving on state roads.
What state do you live in? Does your state charge a value-based tax as part of the registration fee? Maybe your state law changed between 2020 and 2021, or maybe you weren't actually allowed to claim the fee last year.
