A Simplified Employee Pension (SEP) can still be set up for 2019, and you can make contributions to it that you can deduct on your 2019 income tax return.
Business Owners Still Have Time to Set Up a SEP Plan for 2019

A Simplified Employee Pension (SEP) can still be set up for 2019, and you can make contributions to it that you can deduct on your 2019 income tax return.