Do you have to record a one time gig on your taxes?

If you were paid more than $600 then you should have received a 1099 for the amount.  You can see how to enter a 1099 at Where do I enter a 1099-MISC?.  Even if you did not receive a 1099, you should still report the income as other income in case the form just did not get to you in time.

You can do this in TurboTax Online by following these steps:

1. Within your Federal tax return, click on Income & Expenses at the top of the screen
2. Scroll down to Less Common Income and select Start for Miscellaneous Income
3. Click Start on the Other income not already reported on a Form W-2 or Form 1099 line
4. Choose Yes for Other Wages Received, Continue through Household Wages and Sick or Disability Pay, Yes Any Other Earned Income, and choose Other and Continue
5. Enter a description (even "Gig" would work) and the amount and Done