Here are some of the key tax-related deadlines affecting businesses and other employers during the first quarter of 2019. Keep in mind that this list isn’t all-inclusive, so there may be additional deadlines that apply to you. Contact us to ensure you’re meeting all applicable deadlines and to learn more about the filing requirements. January 31 File 2018 Forms W-2, “Wage and Tax Statement,” with the Social Security Administration and provide copies to your employees….