Are you more likely to get your taxes audited in the US if you report higher income?
The IRS does seem to audit you more the higher your income is. In 2011, the IRS audited 12.5% of people with reported incomes of over 1 million dollars per year. From 2006-2011 though they only audited 1% of people with incomes lower than $200,000 per year.
In 2011, people who make over $1,000,000 per year paged about 29% in taxes on average. Interestingly the tax rates can range from 15% to 35%.
