The IRS considers  undocumented cash income (no W-2 or 1099-MISC), for work performed, to be self employment income. Enter at "Business Income & Expenses" and TurboTax (TT) will complete Schedule C or C-EZ for you and allow you to deduct any expenses (e.g. mileage) associated with this income. You'll also have to pay self employment tax (social security) on any profits greater than $400.

You may have to upgrade to the Home & Business version of TT. There's a chance you may be able to use TT Deluxe. Enter your income at the 1099-Misc screen (even if you didn't get a 1099-misc). You do not need the payer's ("employer's") Employer ID Number (EIN).

In TurboTax (TT), enter at:
- Federal Taxes tab

 - Wages & Income

-        “I’ll choose what I work on” Button

Scroll down to:

   - Other Common Income

      -Income from Form 1099-Misc

If you made less than $1900 ($6300 if you are under age 18), there's a better way to handle it. Reply back for details.