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.
As defined by the Internal Revenue Service, the optional standard mileage rate for 2012 is 55.5 cents per mile. The rate is defined as optional because a business or taxpayer might, instead, use the actual cost of using and maintaining a vehicle for business, medical, moving or charitable purposes.