Form W4 (2018) Future developments. For the latest information about any future developments related to Form W-4. such as legislation enacted after It was published, go to www.lts.gov/FormW4. Purpose. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Consider completing a new Form W-4 each yea and when your personal or financial situation changes. Exemption from withholding. You may claim exemption from withholding for 2018 if both of the following apply. • For 2017 you had a right to a refund of all federal income tax withheld because you had no tax lability, and • For 2018 you expect a refund of all federal Moan° tax withhold because you expect to have no tax liability. if you're exempt, complete only lines I, 2, 3. 4, and 7 and sign the form to validate It. Your exemption for 2018 expires February 15, 2019. See P . 505, Tax Withholding and Estimated Tax, to learn more about whether you quafify for exemption from withholding. General Instructions If you aren't exempt, follow the rest of these instructions to determine the number of withholding allowances you should claim for withholding for 2018 and any additional amount of tax to have withheld. For regular wages, withholding must be based on allowances you claimed and may not be a flat amount or percentage of wages. You can also use the calculator at wwwirs.gov1W44pp to determine your tax withholding more accurately. Consider using this calculator If you have a more complicated tax situation. such as W you have a working spouse, more than one Job, or a large amount of nonwage income outside of your job. After your Form W-4 takes effect, you can also use this calculator to see how the amount of tax you're having withheld compares to your projected total tax for 2018. If you use the calculator, you don't need to complete any of the worksheets for Fonn W-4. Note that if you have too much tax withheld, you will receiv