The Internal Revenue Service is not living up to its pledge to crack down on wealthy tax cheats, an IRS watchdog group says, citing a drop in audits of millionaires last year. Those with incomes of $1 million and above had a 5.6 percent chance of getting audited in fiscal year 2008, which ended last September, down from 6.8 percent the previous year, according to IRS figures. The actual number of millionaires audited fell from 23,200 to 21,874; the number of millionaires filing tax returns grew from 339,138 to 392,776. In the face of growing federal deficits and public calls to lower the tax gap - the amount of taxes due but not reported and paid - the drop in millionaire audits is surprising," said the Syracuse University-based Transactional Records Access Clearinghouse in a report Monday. It said the significant drop in audits of richer Americans contrasted with IRS statements last year that it was making strong progress in enforcement, especially of those with incomes of more than $1 million. The TRAC report said focus on high earner returns is critical because of the huge rewards. Among those millionaire audit cases where additional taxes were recommended, the average was $198,000 after face-to-face audits and $137,000 for audits done through correspondence. In total, the IRS collected $56.4 billion in enforcement revenues last year, down from $59.2 billion in 2007 and the first decline in collections in a decade.