From the article…
Many who do not file tax returns still have taxes deducted from their pay checks. Out of that $11.64 billion total, undocumented immigrants pay $6.9 billion in sales and excise taxes, $3.6 billion in property taxes and about $1.1 billion in personal income taxes. ITEP estimated that if America’s 11 million undocumented immigrants were granted citizenship allowing them to work legally, current state and tax contributions would be boosted by over $2.1 billion a year.