What is income tax returns in the US?

what is the income tax returns and how is it calculated?if i earn about $440 a week as a part time nurse in a hospital and makes about 1760 a month how are they going to calculate my income tax per month.If i earn that $1760 a year and about $21120 a year,can the income tax experts tell me how much i can earn a year as income tax returns?If an international student is working off campus or even on campus is he entitled to income tax returns as a result from working?What form do they give the income tax returns?Please answers all questions for me to know everything about income tax returns.

I think you are asking about a refund, not a tax return. The tax return is the form or set of forms you file with the IRS. The money you get back is called a refund.

I'm not sure you understand just what a refund is. Through the year you might have money withheld from your paycheck for federal income tax. At the end of the year, you prepare a form called a tax return to calculate how much tax you owe total for the year, and compare that to what was withheld. If you had more withheld than your total tax, you get the extra back as a refund. If you didn't have enough withheld, you have to pay the rest rather than getting a refund.

A refund isn't some sort of bonus the government gives you for working. It's like if you went to WalMart and bought $16 worth of items, but gave the cashier a $20 bill. You'd get a "refund" of $4, but it's not them giving you something, it's just getting your own money back.

Income tax returns are not calculated. They are the forms you fill out.