I received a 480.6C from my contractor. In which category can I fill that on my tax income?

You would report it under self employment income. Self employment income and expenses go on schedule c.

1. Open or continue your return.
2. Navigate to the Schedule C section:
   • TurboTax Online/Mobile: Go to Schedule C.
   • TurboTax Desktop: Search for schedule c and select the Jump to link.
3. Answer Yes to Did you have any self-employment income or expenses?
   • If you've already entered self-employment work and need to enter more, select Add another line of work.
4. Follow the onscreen instructions to enter your Schedule C.

You may qualify for credit if you paid foreign taxes.

1. Go to Deductions & Credits
2. Scroll Down to Estimates and Other Taxes Paid
3. Click start next to Foreign Taxes

 

For more details check BrittanyS response.