Hopefully you will find this little piece of advice useful and enjoy the additional money through-out the year; If you are getting a return, you are losing money. Lending money, interest free to the Government, is not a good idea fiscally. Change your deductions, look into a bit of investing, and do some planning and saving for retirement. Just putting it in a standard savings account will give you more of a return, maybe 1% or a bit more, than simply over-paying your tax and then celebrating getting back less money.
The Government doesn't need that money you lend them and you can do much better with it in hand than you can letting the Government use it and then returning less to you, after inflation, than you gave them.
Long term guys! Think in the longer term.