I am having trouble finding an option to put negative income to my business. My business took a loss this year

Assuming you are the sole owner of your business, enter the income and expenses for your business on Schedule C and TurboTax will calculate the loss to report on your tax return. This topic is found under Income >> Self-Employment.

The easiest way to find this section of TurboTax is to open your return and use the Search box at the top right side of the TurboTax header. Click on the magnifying glass, type in "schedule C", hit Enter, and click the "jump to" link to go directly to beginning of that topic.

Or go to the left column in TurboTax Online and click on Tax Tools >> Tools >> Topic Search. Type in your topic, then click the topic in the list to go directly to the start of that section.