Cause. Hives can also be classified by the purported causative agent. Many different substances in the environment may cause hives, including medications, food and physical agents. In perhaps more than 50% of people with chronic hives of unknown cause, it is due to an autoimmune reaction. Medications
The average American pays almost 30% of their income to taxes. Here's the breakdown. According to the IRS's preliminary data from the 2015 tax year (the returns you filed during 2016), there was a total of $1.454 trillion in income tax owed, which translates to an average effective federal income tax rate of about 13.5% per return.
The top 50 percentâs average income tax rate increased from 13.05 percent to 13.76 percent. The average tax rate for taxpayers in the top 1 percent also increased from 23.4 percent to 23.5 percentâthe highest average tax rate of any income group.However, the average tax rate for the top 0.1 percent remained essentially flat, changing from 22.84 in 2010 to 22.82 percent in 2011.he average tax rate for taxpayers in the top 1 percent also increased from 23.4 percent to 23.5 percentâthe highest average tax rate of any income group.