TCWF. December 2020. What are some of the most effective tactics for advancing tax credit legislation? Each year, Tax Credits for Workers and Their Families (TCWF) releases a set of case studies on the strategies and messages advocates used in recent campaigns to create, expand, or protect state-level Earned Income Tax Credits (EITCs). This year, we highlighted successful campaigns to expand state EITCs in California and Colorado, as well as a guide to advocating for the EITC during the COVID-19 pandemic.