BAGHDAD, Jan 22 (Reuters) - Iraq announced the sale of $1 billion in bonds guaranteed by the United States, paying an interest of 2.1 percent, far below the 9 percent yield on the country's non-guaranteed debt.

The U.S.-guaranteed five-year bonds were issued on Wednesday, the finance ministry said in a statement on Sunday.

The Iraqi government, which relies almost exclusively on oil income, has struggled to pay its bills since crude prices dropped in 2014, the same year that Islamic State militants seized a third of the country's territory. The Iraqi government in November said it plans to issue $2 billion worth of bonds on international markets to help narrow its budget deficit in 2017.

The bonds will be sold in two equal tranches of one billion dollars each, one of them with a U.S. guarantee that would reduce its cost of borrowing, it said.

Iraq has a speculative rating of B/B- from both S&P and Fitch. It has a $2.7 billion in international bonds due in 2028 with a coupon of 5.8 percent, currently yielding about 9 percent IQ024029557=.

(Reporting by Maher Chmaytelli; Editing by Mark Potter and Elaine Hardcastle) ((maher.chmaytelli@thomsonreuters.com; +9647901917030;))