While not directly tax related, a bill (The Currency Overhaul for an Industrious Nation (COIN) Act) has been introduced in Congress that would end use of the penny. The bill calls for rounding down any cash transaction that ends in
in 1,2,6 and 7 cents; totals ending in 3,4,8, or 9 cents would round up. Notice " cash transactions", I assume that charges and checks would still be to the penny. Introduced by Representative Jim Kolbe (R- AZ), the bill is intended to deal with the increasing cost of making the penny. Of course, this law will end the need for the penny but increase the need for the nickel. According to a CNN/Money article on the bill, it just so happens that copper is the main metal in the nickel and guess who's home state in the nation's largest producer of copper? Can you say "pork barrel"?
There is other currency and coinage legislation in the bill which the CNN/Money article covers.
While it is not likely that the bill will pass, it does have one benefit. The time Congress spends dealing with it is time they are not messing with taxes.