June 4, 2019 The IRS urges you to check your tax withholding or estimated tax payments soon to be sure you pay enough tax throughout the year and avoid a tax-time surprise like owing more than you expect. Check using the IRS Withholding Estimator or Publication 505, particularly if you: owed additional tax with your return this year want to adjust the size of your refund for next year have a life change this year like marriage, childbirth, adoption, buying a home or an income change adjusted your withholding late last year Adjust your withholding by submitting a new Form W-4 to your employer. If you don’t pay taxes through withholding or don’t have enough withheld, you can make estimated tax payments.