Several restaurants offer "tax relief" specials at participating locations on 4/15.

• P.F. Chang's China Bistro: 15% off the bill. Find a nearby location.
• Cinnabon: Free Cinnabon Bites. Valid on participating U.S. mall-based Cinnabon between 5 to 8pm local time.  Find a nearby location.
• Taco Del Mar: Free Taco with this printable coupon.  Find a nearby location.
• McCormick & Schmick's Seafood Restaurants: $10.40 entree menu. Every tax payer will also receive a $10.40 tax relief dinner certificate for a future visit.  Find a nearby location.
• T.G.I. Fridays: Bonus Bite Cards. $5 Bonus Bites with a $15 to $25 purchase, and $10 Bonus Bites Card with a $25 purchase or more.  Find a nearby location.
• MaggieMoo's: Free scoop of ice cream at participating locations.  Find a nearby location.

Note that while these are generally available, there might be locations that are not offering the specials due to disclaimers about "participating locations only."

Originally posted earlier, this deal has been revised and this is just a friendly reminder.