IRS FAQs on Form W-4

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Published: 03/18/21 5:00 AM

Title image for IRS FAQs on Form W-4 showing a tax form, a notebook and a yellow sticky note with the words "need help?" written on it.

IRS FAQs on Form W-4

This article was published on: 03/18/21 5:00 AM

This Compliance Overview presents the answers to IRS FAQs on Form W-4. Employers must have new employees complete a number of forms before they can begin their employment. Form W-4 is one of these forms. These IRS FAQs on Form W-4 provide employers the information they need to adequately set up a new employee’s filing status for payroll tax purposes. Form W-4 is published and updated by the U.S. Internal Revenue Service (IRS).

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This Compliance Overview is not intended to be exhaustive nor should any discussion or opinions be construed as legal advice. Readers should contact legal counsel for legal advice.

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On Form W-4, employees can also declare the number of dependents, the tax credits and deductions they intend to claim. While this form is often used for new hires, employees can update the W-4 form they have on file with their employer whenever a change in filing status, dependents or other tax credits and deductions take place.


  • Form W-4 is used to declare filing status, dependents, tax credits and tax deductions.
  • Employers use Form W-4 to determine some employee payroll withholdings and deductions.
  • Employees can change their withholdings at any time by submitting a new W-4 to their employers.

Important Versions

  • The IRS redesigned Form W-4 2020 to reduce complexity and increase transparency.
  • A new 2021 version was released in December 2020.
  • Form W-4 is also available in Spanish.

IRS FAQs on Form W-4 – General FAQs

  1. Where can I download the new Form W-4?

About Form W-4, Employee’s Withholding Certificate

  1. Why redesign Form W-4?

The new design reduces the form’s complexity and increases the transparency and accuracy of the withholding system. While it uses the same underlying information as the old design, it replaces complicated worksheets with more straightforward questions that make accurate withholding easier for employees.

  1. What happened to withholding allowances?

Allowances are no longer used for the redesigned Form W-4. This change is meant to increase transparency, simplicity, and accuracy of the form. In the past, the value of a withholding allowance was tied to the amount of the personal exemption. Due to changes in law, currently you cannot claim personal exemptions or dependency exemptions.

  1. Are all employees required to furnish a new Form W-4?

No. Employees who have furnished Form W-4 in any year before 2020 are not required to furnish a new form merely because of the redesign. Employers will continue to compute withholding based on the information from the employee’s most recently furnished Form W-4.

IRS FAQs on Form W-4 – Employee FAQs

  1. My tax situation is simple. Do I have to complete all of the steps?

 No. The form is divided into five steps. The only two steps required for all employees are Step 1, where you enter personal information like your name and filing status, and Step 5, where you sign the form. Complete Steps 2 – 4 only if they apply to you. Doing so will make your withholding more accurately match your liability.

  1. What happens if I only fill out Step 1 and then sign the form?

 Your withholding will be computed based on your filing status’s standard deduction and tax rates, with no other adjustments.

  1. When should I increase my withholding?

 You should generally increase your withholding if:

  • You hold more than one job at a time or you and your spouse both have jobs (Step 2) or
  • You have income from sources other than jobs or self-employment that is not subject to withholding (Step 4(a)).

If you do not make adjustments to your withholding for these situations, you will very likely owe additional tax when filing your tax return, and you may owe penalties. For income from sources other than jobs, you can pay estimated tax instead of having extra withholding.

  1. When should I decrease my withholding? 

You should generally decrease your withholding if:

  • You are eligible for income tax credits such as the child tax credit or credit for other dependents (Step 3),or
  • You are eligible for deductions other than the basic standard deduction, such as itemized deductions, the deduction for IRA contributions, or the deduction for student loan interest (Step 4(b)).
  1. I want a refund when I file my tax return. How should I complete the redesigned Form W-4? 

The redesigned Form W-4 makes it easier for you to have your withholding match your tax liability. But if you prefer to have more tax than necessary withheld from each paycheck, you will get that money back as a refund when you file your tax return (keep in mind though you do not earn interest on the amount you overpay). The simplest way to increase your withholding is to enter in Step 4(c) the additional amount you would like your employer to withhold from each paycheck. Note, even if you don’t have any income tax withheld from your wages, you may get a refund if you are eligible for tax credits such as the earned income credit, the additional child tax credit, or American opportunity credit.

  1. Why do I need to account for multiple jobs (Step 2)? I have never done that before. 

Tax rates increase as income rises, and only one standard deduction can be claimed on each tax return, regardless of the number of jobs. Therefore, if you have more than one job at a time or are married filing jointly and both you and your spouse work, more money should usually be withheld from the combined pay for all the jobs than would be withheld if each job was considered by itself. Adjustments to your withholding must be made to avoid owing additional tax, and potentially penalties, when you file your tax return. All of this has been true for many years; it did not change with the recent tax law changes. The old Form W-4 accounted for multiple jobs using detailed instructions and worksheets that many employees may have overlooked. Step 2 of the redesigned Form W-4 lists three different options you should choose from to make the necessary withholding adjustments. Note that, to be accurate, you should furnish a 2020 Form W-4 for all of these jobs.

  1. Which option in Step 2 should I use to account for my multiple jobs? Which is most accurate? What if I don’t want to reveal to my employer on my W-4 that I have a second job? 

Step 2 allows you to choose one of three options, which involve tradeoffs between accuracy, privacy, and ease of use:

  • Step 2(a): For maximum accuracy and privacy, use the Tax Withholding Estimator at You will generally be guided to enter an additional amount to withhold in Step 4(c). While you will need to know the approximate amount of pay for each job, you will enter the additional amount of withholding in Step 4(c) on the Form W-4 for only one of the jobs. If pay for any of the jobs changes significantly, you will need to use the Tax Withholding Estimator again and furnish a new Form W-4 to change the amount in Step 4(c) to have accurate withholding.
  • Step 2(b): If you do not have access to the Tax Withholding Estimator but wish to have roughly accurate withholding and retain privacy, you may use the Multiple Jobs Worksheet on page 3. You will be guided to enter an additional amount to withhold in Step 4(c). While you will need to know the approximate amount of pay for each job, you will enter the additional amount of withholding in Step 4(c) on the Form W-4 for only one of the jobs. If a change in pay for any of the jobs changes the additional withholding amount in the lookup table used with this worksheet, you will need to furnish a new Form W-4 to change the amount in Step 4(c) to have accurate withholding. If you (and your spouse) have a total of only two jobs and the pay at the higher-paying job is more than double the pay at the lower paying job, this option is generally more accurate than choosing Step 2(c). If the pay at each job is more similar, choosing Step 2(c) is more accurate than choosing Step 2(b).
  • Step 2(c): If you (and your spouse) have a total of only two jobs held at the same time, you may check the box in Step 2(c) on the Forms W-4 for both jobs. That is, to use this option, you should complete a Form W-4 for each job with the box in Step 2(c) checked. The standard deduction and tax brackets will be cut in half for each job to calculate withholding. You will not need to furnish a new Form W-4 to account for pay changes at either job. This option is accurate for jobs with similar pay; otherwise more tax than necessary may be withheld from your wages. This extra amount will be larger the greater the difference in pay is between the two jobs.
  1. The instructions above Step 3 say that in multiple job households, adjustments in Steps 3 – 4b are to be made on only one form, and that withholding will be most accurate if the adjustments are made on the W-4 for the highest- paying job. But what happens if pay at two jobs is relatively similar or if changes in pay overtime result in another job becoming the highest paying?

In general, making these adjustments on the Form W-4 for the highest paying job increases accuracy. However, if the jobs in your household pay about the same or if changes in pay overtime change which is the highest paying job, it is less important which Form W-4 is used to make the adjustment.

  1. What if I have side work where I’m not treated as an employee?

If you have income from self-employment (including as an independent contractor), you will generally owe both income tax and self-employment tax. Form W-4 is primarily intended to be used by employees who are not subject to self-employment tax. Thus, like the old Form W-4, the redesigned Form W-4 does not compute self-employment tax. If you would like to use Form W-4 to make an adjustment to your withholding to account for self-employment income that you will receive from another source, use the Tax Withholding Estimator at or refer to IRS Publication 505.

  1. What if I don’t want to reveal the amount of my non-job income, such as income from earnings on investments or retirement income, on my Form W-4 (Step 4(a))?

You are not required to have tax on non-job income withheld from your paycheck. Instead, you can pay estimated tax on this income using Form 1040-ES, Estimated Tax for Individuals. However, if you want to use Form W-4 to have tax for this income withheld from your paycheck and you do not want to report this income directly in Step 4(a), you have several options. First, you can use the Tax Withholding Estimator at The estimator will help you calculate the additional amount of tax that should be withheld from your paycheck. You will then enter that amount in Step 4(c), without reporting the income to your employer. Second, you can determine for yourself the amount of extra withholding needed to pay for the tax on your other income (for example, by using Publication 505), divide that amount by the number of pay dates in the year, and enter the result in Step 4(c). Third, if this is the only job in your household, you can check the box in Step 2(c), which will increase your withholding and significantly reduce your paycheck. The amount of this extra withholding varies across taxpayers and ranges from zero to $20,000 annually—and you may not know how much extra is being withheld. Also, whether this extra withholding in turn is too little or too much—and results in a balance due or refund—depends on the amount of your non-job income.

  1. Is there a computer program I can use to help me complete Form W-4?

Yes. To provide maximum accuracy, you are encouraged to use the Tax Withholding Estimator available at You should consider using the withholding estimator if you:

  • Expect to work only part of the year (this does not apply if you are only switching jobs),
  • Had a large balance due or refund last year and it is no longer the beginning of the current year,
  • Have dividend or capital gain income or are subject to additional taxes, such as the additional Medicare tax,
  • Have self-employment income,
  • Prefer the most accurate withholding for multiple job situations, or
  • Prefer to limit information provided in steps 2–4 but do not want to sacrifice accuracy.

IRS FAQs on Form W-4 – Employer FAQs

  1. Are new employees first paid after 2019 required to use the redesigned form?

Yes. All new employees first paid after 2019 must use the redesigned form. Similarly, any other employee who wishes to adjust their withholding must use the redesigned form.

  1. How do I treat new employees first paid after 2019 who do not furnish a Form W-4?

New employees first paid after 2019 who fail to furnish a Form W-4 will be treated as a single filer with no other adjustments. This means that a single filer’s standard deduction with no other entries will be taken into account in determining withholding. This treatment also generally applies to employees who previously worked for you who were rehired in 2020 and did not furnish a new Form W-4.

  1. What about employees paid prior to 2020 who want to adjust withholding from their pay dated January 1, 2020, or later?

Employees must use the redesigned form.

  1. May I ask all of my employees paid before 2020 to furnish new Forms W-4 using the redesigned version of the form?

Yes. You may ask, but as part of the request you should explain that:

  • They are not required to furnish a new Form W-4, and
  • If they do not furnish a new Form W-4, withholding will continue based on a valid form previously furnished.

For those employees who furnished forms before 2020 and who do not furnish a new one after 2019, you must continue to withhold based on the forms previously furnished. You are not permitted to treat employees as failing to furnish Forms W-4 if they don’t furnish a new Form W-4. Note that special rules apply to Forms W-4 claiming exemption from withholding.

The Internal Revenue Service has launched an online assistant designed to help employers, especially small businesses, easily determine the right amount of federal income tax to withhold from their workers’ pay. Use the Income Tax Withholding Assistant if you typically use Publication 15-T to determine your employees’ income tax withholding.

  1. Will there still be an adjustment for nonresident aliens?

Yes. The IRS will provide instructions in the 2020 Publication 15-T, Federal Income Tax Withholding Methods, on the additional amounts that should be added to wages to determine withholding for nonresident aliens. Additionally, nonresident alien employees should continue to follow the special instructions in Notice 1392 when completing their Forms W-4.

For more information about how TPG can help you with your Payroll and employee tax needs, visit our Payroll & Tax Management page, call us at 909.466.7876 or you can fill out this form. In addition to these IRS FAQs on Form W-4, you might also be interested in learning more about our Payroll Processing service.

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