You are an employee so the wages should be reported like a W-2.
Do a substitute W-2 with the income and nothing in medicare or FICA boxes. After the W-2 is entered, there is box under:
Do any of these uncommon situations apply to this W-2 and you will:
X Foreign or international organization
X substitute W-2 if it is not a W-2 you have gotten.
Note: You have to work in the U. S. for the foreign country to qualify for this.
