At no point in the life cycle does the average unlawful immigrant household pay more in taxes than it takes out in benefits.

2010 dollars

The critical fact shown in Chart 7 and Chart 8 is that, for each age category, the benefits received by unlawful immigrant households exceed the taxes paid.

In each age category, unlawful immigrant households receive roughly $2.00 in government benefits for each dollar paid in taxes.

Between ages 45 and 54 (generally considered prime earning years), unlawful immigrants actually receive nearly $3.00 in benefits for each dollar paid in taxes.

https://www.heritage.org/immigration/report/the-fiscal-cost-unlawful-immigrants-and-amnesty-the-us-taxpayer