Here are some of the key Q1 2021 tax deadlines affecting businesses and other employers. Keep in mind that this list isn’t all-inclusive, so there may be additional deadlines that apply to you. In addition to the Q1 2021 tax deadlines, contact us to ensure you’re meeting all applicable deadlines and to learn more about the filing requirements. January 15 Pay the final installment of 2020 estimated tax. Farmers and fishermen: Pay estimated tax for 2020.   February 1 (The usual deadline of January 31 is a Sunday) File 2020 Forms W-2, “Wage and Tax Statement,” with the Social Security Administration and provide copies to your employees. Provide copies of 2020 Forms 1099-MISC, “Miscellaneous Income," and/or 1099-NEC, "Non-Employee Compensation” to recipients of income from your business (as applicable) where required. File...