Expanding eligibility for the working families' tax credit to everyone age 18 and older.

HB 1214 expands Washington's Working Families' Tax Credit to include all residents aged 18 and older, removing a prior age restriction that limited eligibility to those under 18. The bill updates eligibility rules in the tax code to allow individuals who meet federal credit requirements (including filing a federal return and meeting income thresholds) to qualify regardless of age, as long as they were 18 or older by the end of the prior tax year. It maintains existing credit amounts ($300-$1,200 based on children) and calculation methods, with annual inflation adjustments. This change directly affects low-income Washington residents aged 18+ who previously may have been excluded due to age.