The 27-year-old Hingis denied using cocaine, but the tribunal rejected suggestions there were any doubts over her sample.
Although the five-time Grand Slam winner is now retired, her suspension is backdated to Oct. 1.
The ITF also disqualified Hingis' results from last year's Wimbledon and any subsequent tournaments she played in. She also forfeits any ranking points gained and US$129,481 in prize money.
Hingis lost 6-4, 6-2 to Laura Granville in the third round at Wimbledon last year.
- Send us your sports story tips
- Click here for more sports stories
