Have you had your car more than 3 years? If so, you don't have to worry about the tax. Luckily I did my research on the DMV website before I went there to register my car. When I got there, the clerk told me I had to supply proof I paid tax when I bought it or pay the tax to VT even though it was clear I bought the car more than 3 years ago. I proceeded to ask the clerk if it wasn't true that if one has owned their car for more than 3 years that they don't have to pay the tax? The clerk looked rather flummoxed, glared at me, and crossed the tax off my total. I wondered if it was truly a mistake or if it's standard operating procedure for them to tell you to pay the tax.