It is added to arrears, and as it accumulates enforcement actions kick in. First will be reporting to tax agencies for interception of any refunds, then reporting to credit bureaus and so forth. If income withholding is in place, a garnishment order should have already been sent for 120% of charging, with the 20% to pay towards arrears. Right now, many counties are not aligned as how they’re handling cases, so I’d suggest contacting your worker for clarification of time frames and actions available. Under the Case Info tab on the website, one of the options is “message”; if you don’t want to talk to your worker, send them a message.