Picture of a brown recluse spider. Note the violin pattern on the cephalothorax and light-colored hairless abdomen. Picture of a brown recluse spider. Picture of a brown recluse spider head close-up. Generalized symptoms of bites from black widow and brown recluse spiders may include: 1  fever,  nausea,
Standard Mileage Rate Law and Legal Definition. The standard mileage rate (SMR), also known as mileage per diem, is the amount per mile that the Internal Revenue Service (IRS) allows small businesses and self-employed persons to use to calculate their vehicle expenses for tax deduction purposes.
The Internal Revenue Service has released the standard mileage rate for 2015. Under the 2015 rules, the standard mileage rate for the use of a vehicle is: 57.5 cents per mile for business use. 23.5 cents per mile driven as medical or moving expenses. 14 cents per mile driven for charitable purposes.