The 2014 IRS Mileage Rates, which begin on January 1, 2014, are as follows:
2014 Business Mileage Rates
For medical miles driven, the 2014 IRS mileage rate is twenty three and a half cents per mile ($.23/ mile).
For moving miles driven, the 2014 IRS mileage rate is twenty three and a half cents per mile ($.23/ mile).
For charity miles driven, the 2014 IRS mileage rate is fourteen cents per mile ($.14/mile).
Believe it or not, the 2014 IRS mileage rates are mostly lower than in 2013. Usually IRS rates go up a bit each year in order to keep up with inflation. Not so with mileage rates. All but the charity mileage rate represent a decrease from 2013.
The rules for using mileage rates on your tax return remain the same: if you use the mileage rate, you cannot also take depreciation on that same vehicle. You are also limited to four vehicles for which you can claim business miles.
The source for this information is the IRS. You can go here to see their page on the 2014 IRS Mileage rates.