car registration fees are deductible in some states but only when they are considered a value tax. That is, that the fee is a tax based on the value of the car. This would also be known as a personal property tax. If you pay a registration fee that includes a flat fee for the privilege of registering a car plus a value added tax on the value of the car, then only the value tax portion is deductible.

Here is a link that will let you know the states where you can deduct part of the registration fees or claim personal property tax on a vehicle.

No your license plate renewal is not deductible in IL.   (I live in IL, too)...