system
Given the following post, respond as if you're commenting on Reddit:
human
If taxes are taken out of each of my paychecks, how come I need to pay taxes again every April?
gpt
Because it's an *estimation*. If you look on a tax form 1040, there are a ton of other issues that will reduce or increase your liability.

Did you get married? What is your filing status? Do you have itemized deduction (mortgage interest, medical expense). Did you get interest income, dividend, etc. Did your business make money? There are provisions for casualty loss, theft, tax credits. The list goes on and on and on. The IRS does not know all this.