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The reality is that it's difficult for USCIS to track your unauthorized work. It's not possible for them to know if you've ever worked for some entity if you've never provided your SSN to that entity for payroll purpose e.g. you get paid by cash. Now whether you want to work for such entities is another matter. They also can't track your bank account activities. I think only law enforcement can do that with a court order and USCIS clearly is not law enforcement.Even if you provided your SSN and is on the payroll, it's not possible for USCIS to find out unless they see your tax records. Contrary to popular belief, USCIS doesn't have access to your IRS returns. That's how undocumented immigrants can pay their taxes for years without being deported. However, USCIS is entirely within their rights to request such tax records from you when you apply for immigration benefits e.g. OPT extension, green card. If they want your tax records, they'll request (most likely through RFE's) complete tax returns or tax transcripts, which include the amounts of your income, paid taxes and all W2's and 1099's. By comparing your stated income to those W2/1099's, it's a piece of cake to figure out if you've worked without authorization. Then you'll be in serious trouble. Some immigration applications require you to declare your past employment e.g. form G-235 (used in green card application) requires you to declare all employment in the past 5 calendar years. That's another way for them to find out unauthorized employment.Summary: they can't directly track unauthorized employment but they can request info from you that will reveal such activities if they have suspicions or if the application process requires you to. Just don't do it to avoid getting in trouble later.

They may have taken out taxes but not paid into the government tax account.If you have check stubs or a W2 , that is the first place to look for documentation.If you have a 1099 , you had the obligation to pay the government, not the employer.Independent contractors and gig workers are often not treated as employees for tax purposes and given 1099’s because it is easier and less expensive for the employer.There are other benefits lost by being mis-classified, like the right to unemployment benefits.On the other hand, my record shows a gap because we had an office manager doing the bookkeeping and embezzling. The pay check stubs showed money withheld , but the funds went in her pocket and not the tax account. Not a fun situation.

A 1099-MISC Form reports income that exceeds $600 generated from independent contracting services, government payments, dividends & interest, etc. Generally,the entity that pays you must fill out the appropriate 1099 form, as there are different forms for each type of earned income. In 2016, Airbnb recently stated that they would only issue 1099's if you made more than $20,000 and had over 200+ transactions.For more information on the 1099 check out this article.