The federal income tax is a pay-as-you-go tax. You must pay
taxes as you earn or receive income throughout the year, and then
you can file your taxes traditionally or do your taxes online
once the year is out.
There are two methods for paying taxes:
If you do not have enough taxes withheld, or you do not pay
enough in estimated taxes, you may be subject to a penalty
for underpaying your taxes.
The IRS Withholding Calculator can help you
determine if your withholding is appropriate for your income,
dependents and other tax information.
If your income is low enough that you will not have to pay
income tax, you may be exempt from income tax withholding. You may
still be subject to Social Security and Medicare tax withholdings.
You can claim an exemption from income tax withholding only if:
For more information, see IRS