According to the federal website cars.gov, the answer is no. The credit
you received will not be counted as income.
Despite being short-lived, the government says the Cash for Clunkers
program was a major success! The US Department of Transportation reports
the rebate program resulted in more than 40 million dollars in requests
in the state.
Kentucky ranked 21st overall for the number of vouchers submitted with
327 million dollars in rebates requested. Kentucky's car trade in
program is going on right now, it started September first and will
continue until the 25 million dollars allotted runs out.