How do illegal immigrants pay taxes if they are here illegally?

They don't they send it all to Mexico back home to their families.
Maybe they use this tactic :

The IRS is defending its decision to let illegal immigrants claim up to three years’ refunds on income even if they never paid income taxes, telling Congress in a new letter last week that agency lawyers have concluded getting a Social Security number triggers the ability to go back and ask for previous refunds.

Flashback: IRS defends paying refunds to illegals who never filed taxes | From the Trenches World Report
 
Yes, illegals can pay income tax without being deported. Most chose not to.
 
Can an illegal alien file taxes and not get deported?
“Immigrants illegally in the U.S. collectively contribute nearly $12 billion each year to state and local tax coffers, according to a new report that challenges recent election cycle rhetoric.

The study from the Institute on Taxation & Economic Policy found that immigrants in the U.S. without legal permission kick in their billions in the form of income, property, sales or excise taxes.”

https://www.usnews.com/news/articles/2016-03-01/study-undocumented-immigrants-pay-billions-in-taxes

That’s how.
 

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