Based on the information given the terms that describes this is: underground economy.
What is underground economy?
Underground economy can be defined as the way in  which a person hide their income from government or tax authorities so as to avoid remitting their tax to government.
Based on the given given scenario Maria his hidden her income and  never bothers to report her earnings to the IRS because she does not what to pay tax.
Inconclusion the terms that describes this is: underground economy.
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