I know that Illinois you used to be able to deduct the sales tax, but the law changed several years ago and we can no longer get in on that savings. Every state is different so you need to ask your local dealer. As far as tax deductions go, if you are 65 years or older and itemize your deductions, you CAN deduct all medical expenses that exceed 7.5% of your adjusted gross income through 2016. It used to be 7.5% for everyone but the IRS recently raised it to 10%. I would include a copy of the RX from your doctor when you file your return. You should call your accountant though to be sure of how this purchase will affect you.