If tax is included then it's already built into the price of the ticket. That's how all the concessions are done.
What am I missing here? 
The STH prices for parking passes all increased by 5.35% so that they are no longer rounded to the dollar. So in order to account for the new tax for the cash lots, the Nats will either have to lower their profit margin, raise prices by five bucks per lot, or raise prices by 5.35% per lot. Not passing the tax along to the fans doesn't seem to fit the Lerner model and the prices for the official lots are already out of whack with the independent cash lots so a $5 increase would cause cost them money as fans look for other options, but I agree that counting pennies at a cash lot doesn't make sense as an option either. Of course I'm more concerned that the Yards and the gravel lot will increase their prices by $5 a game.
