New withholding tables have been released so that employers can change your withholding (they are required to do it by February 15th, so if today is pay day don’t think you’ll see it today). Here are some FAQs from the IRS (https://www.irs.gov/newsroom/irs-withholding-tables-frequently-asked-questions). I will caution...this says you don’t need to do anything. However I would disagree. While the majority of people may not need to adjust their withhold I would say those with children over 16 will want to check their withholding. Also those that have previously taken extra exemptions because they itemize may also want to change their exemptions.