Federal law requires each state to have a child support enforcement program that complies with federal requirements as a condition of receiving federal funds for child support enforcement and Temporary Assistance for Needy Families (TANF) programs.  As a condition of receiving TANF cash benefits, a family must assign its rights to child support to the state during the months the family receives the benefits.  Assigned child support collections are retained by the state and the federal government as partial reimbursement for TANF assistance. 

Federal law specifies the process by which child support collected by the state on behalf of a family receiving TANF assistance is to be distributed.  The state is required to forward to the federal government a certain portion of the collected support referred to as the "federal share," which varies by state.  The current federal share for Washington is 50 percent, meaning that the state is required to pay to the federal government 50 percent of child support collected on behalf of a family receiving TANF assistance.  The state is permitted to retain or pay to TANF families the remaining 50 percent, known as the "state share."
 
Federal law allows states to pass through up to $100 per month of collected child support to TANF families with one child and up to $200 per month of collected child support to TANF families with two or more children without having to reimburse the federal government for its share of the child support collected.  This is known as the child support pass through.  States that opt to implement the child support pass through must disregard the child support collection paid to the family in determining the family's cash TANF benefit.  A pass-through payment is disbursed only when a child support payment has been received and does not carry over to the next month. 

Washington implemented child support pass-through payments in October 2008, but suspended the child support pass-through payments effective May 1, 2011.  Pursuant to legislation enacted in 2020, on February 1, 2021, the Department of Social and Health Services (DSHS) began to pass through to families receiving TANF assistance up to $50 per month in collected child support for a family with one child and up to $100 per month in child support for a family with two or more children.

Beginning on July 1, 2024, the DSHS must pass through to a TANF family all current child support collected on behalf of the family each month.

The DSHS must disregard and not count as income any amount of current child support passed through to TANF or WorkFirst applicants or recipients when determining eligibility for and the amount of assistance.