Most of the illegals are not paying taxes. Many are receiving Medicaid and food stamps thru their US-born children. And as the IRS IG has said, we are disbursing close to $4 billion a year to illegals thru EITCs.
The illiegals not working is a whole other ballgame. Most who work are on a payroll system. For every nanny or day labor paid under the table, there’s 50 thousand of them working for large companies and paying witholding (no, e verify does not always work)