The lease of a Nissan Leaf does not qualify for a tax break on the federal return.
However, long time Answer Exchange contributor, Sweetie Jean, has posted a handy link to the Nissan website tool to check if there are any state or local incentives are available: http://www.nissanusa.com/leaf-electric-car/ev-incentives
Just "plug in" your zipcode and see what credits may be available.