According to the latest IRS Data Book covering the government’s fiscal year ending September 30, 2010, the overall audit rate on individuals increased slightly to 1.1%; it had been 1% in the 2009 fiscal year. However, for wealthy individuals-those with income of $1 million or more, the audit rate rose to 8.4%, from 6.4% in fiscal year 2009.
The audit rate for sole proprietors also rose slightly. The following is based on gross receipts reported on Schedule C:
Source: 2009 and 2010 IRS Data Books
Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.