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 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 or Premier. Enter your income at the 1099-Misc screen (even if you didn't get a 1099-misc). For details, see <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1901317-schedule-c-ez-net-profit-from-a-business">https://ttlc.int...>
You may want to switch to the download software, instead of online. You can do many returns for one fee and schedule C can be prepared & filed in the Deluxe edition.
@bluedeb - The unearned income threshold is up to $1050 for 2015
