The ITF claims a doping test administered to Hingis last year during Wimbledon returned positive for cocaine. Hingis, 27, revealed the test result on Nov. 1 and announced her retirement from competitive tennis.
"I find this accusation so horrendous, so monstrous, that I have decided to confront it head-on by talking to the press," Hingis said at the time.
"I am frustrated and angry. I believe that I am absolutely 100 percent innocent."
The ITF suspension was retroactive to Oct. 1, 2007. The ITF also disqualified Hingis' results from Wimbledon -- she was eliminated in the third round -- and the other events she played afterward. She must also repay the prize money from those events, a sum of $129,481.
Hingis, who was ranked 19th in the world when she retired, has three weeks to appeal the ruling.
She also retired in 2002 because of a series of injuries but returned to the tour in 2006. Since then she won three tournaments, running her career total to 43 championships, including five Grand Slam titles.
Theater accidentally screens 'Nymphomaniac' trailer instead of Disney's 'Frozen'
Britney Spears on kissing Ryan Gosling, Justin Timberlake in the Mickey Mouse Club