Illegal don’t owe any back taxes.

[LilOlLady]

ILLEGAL DON’T OWE ANY BACK TAXES.
And if we try to figure out how much taxes they owe, we will end up owing the refunds and tax credits, etc. Taxes paid by illegal verses tax refunds.

For example, an illegal immigrant who makes $13,000 a year not only pays no taxes but also can receive a refund of $5,000 by simply filling in five ACTCs. One illegal used a fake address and said four illegal aliens lived there with 20 relatives as dependents, for a grand total tax refund of $29,000!

According to the Center for Immigration Studies, in the 2010 tax year alone, more than 3 million returns were filed with ITINs. About 2.3 million of them paid no federal income taxes and also collected a cumulative $4 billion from the Treasury in tax refunds for claiming ACTCs
?Pay Their Fair Share? vs. Tax Refunds to Illegal Aliens | RedState