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.
A quick calculation shows that the average taxpayer owed $9,655 in income tax. Since the average taxpayer's gross income was $71,258 for 2015, this translates to an effective federal income tax rate of 13.5%. Image source: Getty Images. Just to add a little color, know that this rate is a bit misleading because it includes the more than 50 million tax returns that had no federal income tax liability.