• Your chances of being audited by the IRS are highest (2.61%) in Nevada and lowest (0.47%) in Rhode Island, according to recently released IRS data. The five states with the highest audit risk are Nevada, Alaska, Utah, Wyoming, and California. The five states with the lowest risk are Rhode Island, Kentucky, Indiana, Massachusetts, and New Hampshire. The national average in 1986 was 1.1%, down from 2.3% in 1975. The IRS plans to audit 1.23% of all individual income tax returns in 1987, and 1.32% in 1988.