I actually can name a temorary tax that was temporary.
In my city, they raised the city sales tax .25 in order to build The Ballpark in Arlington, where the Texas Rangers play. A couple of years ago, when the ballpark was paid for, they rolled back the tax hike. I was astonished and pleased.
In a week, the tax is going back up .25, because we are going to build the new stadium for the Dallas Cowboys. I am sure if the promise hadn't been kept regarding the ballpark, the voters would not have voted to fund part of the stadium.
However, that is local----would never, ever count on a "temporary" national tax.
Wow... figures that a true temporary tax would be from TEXAS. :-)