The federal tax provision that allows businesses of all sizes to take a full write-off (termed 100 percent bonus depreciation) of almost any capital equipment, including rolling stock, placed into service during calendar year 2011 expires at the end of 2011, according to an article in the November 11 issue of The State Laws Newsletter. Unless Congress votes to extends full write-off, the law will allow smaller businesses to take only a 50 percent bonus depreciation on new equipment next year, and there are certain limits on that.