There is currently a federal tax incentive of up to a $7,500 tax credit for the purchase of qualifying EVs. There are currently no federal or state incentives for purchasing charging stations. For more information, visit the Incentives page.
The cost of charging an EV is significantly less expensive than the equivalent cost of gasoline. Consider the following example from the Ameren Illinois website. A conventional vehicle getting 30 mpg and traveling 75 miles per month will cost the owner about $7.50 (assuming gasoline at $3.00/gallon). However, an Ameren customer would expect to pay $2.47 (dependent on the rate plan) in electric costs for the same distance.