Deductions & credits

You can adjust out your self-employment income by going to Other Tax Situations, Business Taxes and Deductions, Self-employment tax.

Enter your Self-employment profit as a negative on this screen:

In accordance with the US Chilean Agreement you are citing Agreement Between the United States and Chile, you should print and mail in your tax return with a copy of your Certificate of Coverage with the Chilean system. 

The Agreement does not exempt you from payment into any system, only exemption from requirement to pay into both. 

If you voluntarily pay into the Chilean system you are exempt from paying US Social Security and are eligible to get a Certificate of Coverage to establish your exemption. 

If you are not voluntarily paying into the Chilean system you are not exempt from paying US Social Security.