If you click on forms on the upper right hand corner and go into CT 1040 3,4 and scroll down to Schedule 3 you are able to type in 1 vehicle for each person filing the return. Example: married filing a joint return 2 vehicles, single only 1 vehicle. Hope this helps. Also the reason it is only a portion of the $300 is from portal.ct.gov ct 1040 instructions page 26
