why would you lend the government money interest-free? which is what you are doing when you overpay your taxes. does the government lend you money with no interest? NO.
think on this...
adjust your tax filing status so you pay the bare minimum that you have to and still come out even every year (depending on your income it could be anywhere from 15% to 30%).
if you are dead set on being a lender to the US goivernment, take the money that you save (or should i say that you still have heh) and put it into government bonds. that way, you lend the gub'ment money and get paid for it, as it should be.
if you are filing taxes, that usually means you are gainfully emoployed...it also means that the gvt is not going to do you any favors, because they only do that for people who dont contribute to society. dont do them any favors in return.
granted the interest is not as much as they would charge you if the roles were reversed lol, but it is better than giving it away and your yields are usually tax-free.
an even better idea would be to put it into a high-yield savings account.