“From 2000 to 2011, unauthorized immigrants contributed $2.2 to $3.8 billion more than they withdrew annually (a total surplus of $35.1 billion). Had unauthorized immigrants neither contributed to nor withdrawn from the Trust Fund during those 11 years, it would become insolvent in 2029-1 year earlier than currently predicted. If 10 % of unauthorized immigrants became authorized annually for the subsequent 7 years, Trust Fund surpluses contributed by unauthorized immigrants would total $45.7 billion.”
Unauthorized Immigrants Prolong the Life of Medicare’s Trust Fund.Zallman L, Wilson FA, Stimpson J, Bearse A, Arsenault L, Dube B, Himmelstein D8, Woolhandler S,J Gen Intern Med. 2016 Jan;31(1):122-7. doi: 10.1007/s11606-015-3418-z. Epub 2015 Jun 18.