Calling it their "2012 Tax Relief Plan," Boston Market has a limited-time promo good this upcoming Tax Day, April 17, 2012.
They're offering a printable coupon that is good for a free Individual Meal when you buy an Individual Meal and a fountain drink. You can get the coupon here.
The coupon is good April 17, 2012 only and the free meal must be of equal or lesser value.