If you fail to estimate your federal income tax withholding properly, it may cost you in a variety of ways. If you receive an income tax refund, it essentially means that you provided the IRS with an interest-free loan during the year. By comparison, if you owe taxes when you file your return, you may have to scramble for cash at tax time--and possibly owe interest and penalties to the IRS as well.
When determining the correct withholding amount for your salary or wages, your objective should be to have just enough taxes withheld to prevent you from incurring penalties when your tax return is due. (You may owe some money at the time you file your return, but it shouldn't be much.) You can accomplish this by reading and understanding IRS Publication 505 and 919, properly completing Form W-4 (and accompanying worksheets), and providing an updated Form W-4 to your employer when your circumstances change significantly.
Two factors determine the amount of income tax that your employer withholds from your regular pay: the amount you earn and the information you provide on Form W-4. This form asks you for three pieces of information:
When both spouses work and have taxes withheld at the married rate, they sometimes end up with insufficient taxes withheld. If this happens to you, remember that you can always choose to withhold at the single rate. In addition, you can determine the proper withholding amount by completing Form W-4's two-earner/two-job worksheet.
If you receive an income tax refund, it essentially means that you provided the IRS with an interest-free loan during the year.
To understand Form W-4, you must understand allowances. Think of allowances as cash in your pocket at the time that you receive your paycheck. The more allowances you claim, the less taxes are taken from your paycheck (and the more cash ends up in your pocket on payday). For example, you can maximize the amount withheld from your paycheck to ensure that you have enough tax withheld to cover your tax liability by claiming zero allowances. This will reduce the amount of cash you take home in your paycheck. The following factors determine your number of allowances:
To claim the correct number of allowances, you should complete Form W-4's worksheets. These include a personal allowances worksheet, a deductions and adjustments worksheet, and a two-earner/two-job worksheet. IRS Publication 505 (Tax Withholding and Estimated Tax) explains these worksheets.
To avoid surprises at tax time, it's a good idea to periodically check your withholding. If you accurately complete all Form W-4 worksheets and don't have significant nonwage income (e.g., interest and dividends), it's likely that your employer will withhold an amount close to the tax you'll owe on your return. But in the following cases, accurate completion of the Form W-4 worksheets alone won't guarantee that you'll have the correct amount of tax withheld:
In these cases, IRS Publication 919 (How Do I Adjust My Tax Withholding?) can help you compare the total tax that you'll withhold for the year with the tax that you expect to owe on your return. It can also help you determine any additional amount you may need to withhold from each paycheck to avoid owing taxes when you file your return. Alternatively, it may help you identify if you're having too much tax withheld. If you find that you need to make changes to your withholding, you can do so at any time simply by submitting a new Form W-4 to your employer.
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