Tax credits for hybrids mainly pertain to a Federal tax I believe. You would not be able to get a state tax credit, unless you live in one of the 36 states that currently offers a seperate credit than the Federal tax credit. New York, for example, does offer a $2,000 tax credit for the purchase of a new hybrid vehicle (based upon what I have read).
Federal tax credits will apply in a declining scale of credit based on the number of vehicles by model sold.
From
http://www.fueleconomy.gov/feg/tax_hybrid.shtml
"Hybrids purchased or placed into service after December 31, 2005 may be eligible for a federal income tax credit of up to $3,400.
Credit amounts begin to phase out for a given manufacturer once it has sold over 60,000 eligible vehicles."
This means that you may be eligeble for a tax credit, depending on which model you drive AND when you purchased it. Federal tax credits are not transferrable to the used car market.
"New York Governor George Pataki recently unveiled a comprehensive energy reduction plan that includes a $2,000 hybrid state tax credit, discounted highway tolls for hybrid drivers, and HOV-lane access for hybrids. If the state legislature approves Pataki’s plan, New York taxpayers who buy hybrids could save more than $5,400." (
http://environment.about.com/od/gree...hybridcars.htm)
If Pataki's plan was passed, you would be eligible for the state credit.