If you are self-employed, you do not need an EIN to report your income. You report it under your SSN.
You do not need the EIN of any other company to report cash income that you can report as Other self-employed income.
Please read this TurboTax FAQ on how to report Other self-employed income received in cash, checks or bank transfers:
https://ttlc.intuit.com/replies/4801198
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