Received a 1099 Misc from GM (work for a Chevy store) it was a manufacturers incentive. It is marked as other income. can't find where to mark as manufacturers incentive.

Here are the steps to enter a manufacturer's incentive in TurboTax:

(Manufacturer's Incentives are sometimes referred to as SPIFFS)

• While signed into your account (Take me to my return),
• In the Search box (upper right of program) search "1099 misc" then click the "Jump to" link from results
• Enter your 1099-MISC with amount from Box 3 and on next page, you will be asked to "Describe the reason for this 1099-MISC?" enter SPIFF
• On next screen, check the box for "This was a manufacturer's incentive payment"
  

Thank you for your answer! Do I still need to input them into the 1099 section also? or just put them in on line 21?

If you have manually added the item on line 21 (in desktop program) you would want to go back and take it out if you use my instructions above.  I'm not sure what program you are using, but do know that you can only manually add it to a line in the desktop program.  You would not want to enter it on line 21 AND enter in the 1099 section.

I did check the "This was a manufacturer's incentive payment" box when entering income on my 1099-MISC as a car salesman.  I also entered Spiff as a description.  It won't let me finish without entering Schedule C info.

See if you can delete the Schedule C.

 

To Delete a Form

Open your return in TurboTax. 

In the left side bar, select Tax Tools> Tools.

In the pop-up window Tool Center, choose Delete a form.

Select Delete next to the form/schedule/worksheet and follow the onscreen instructions