Last year, the IRS audited just .86 percent of all tax returns, the lowest rate in a decade, according to CNBC. The reason is that while the IRS, due to fewer resources and more responsibilities, is trying to do more with less, it has also resulted in them just doing less. IRS Commissioner John A. Koskinen, during a speech, acknowledged that there have been fewer audits because, simply, there are fewer auditors to do them, said CNBC. Still, don't go writing off that vacation to Spain as a business expense just yet: considering the number of tax returns filed, .86 percent still represents about 1.4 million returns. They're still watching, and it's probably best not to draw too much attention.