Federal income tax is something the government takes from the money that people and businesses make. In the United States, the Internal Revenue Service is in charge of collecting this tax. The more money you make, the more federal income tax you have to pay. This is because the tax system is set up so that people with higher incomes pay a bigger percentage of their income in taxes.
The money from income tax is used for important things like the military, schools, hospitals, and roads. Every year, people have to tell the government how much money they made and pay any federal income tax they owe. Usually, this tax is taken out of your paycheck before you even get it, or you have to send the government a payment. Federal income tax is a deal for people and businesses because it affects how much money they have left over after the government takes its share.