Yes, income earned from an online app should be reported as taxable.
If your earnings were part of a business activity, you would include them with your Schedule C self-employment. If this is not part of a business activity, you can report this as Other Income:
In TurboTax Online:
- Sign into your account, your return, and click "Pick up where I left off
- Click Federal
- Click Wages & Income
- Get to All Income and scroll down to Less Common Income and click Show more
- Scroll down to Miscellaneous Income, 1099-A, 1099-C and click Start
- Scroll down to Other reportable income and click Start
- Type a description (such as "cashback app income") into the description box and enter the amount
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