Tips for taxpayers who need to file a new W-4 

https://www.irs.gov/newsroom/tips-for 

https://accountinginstruction.info

All taxpayers should review their withholding annually. They can use the IRS Tax Withholding Estimator to check and make sure they're not having too little or too much federal tax withheld. This tool offers workers, retirees and self-employed individuals a step-by-step method to help figure out if they should adjust their withholding.  Those who need to adjust their withholding should submit a new Form W-4, Employee's Withholding Certificate to their employer.