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Iwata turned professional in 2004 and has played on the Japan Golf Tour since then. His first win came at the 2014 Fujisankei Classic. He also won the 2015 Shigeo Nagashima Invitational Sega Sammy Cup. In the second round of the 2015 PGA Championship at Whistling Straits, Iwata shot a 63, which matched the then lowest round in a major championship. Iwata played on the 2016 PGA Tour, having qualified through the 2015 Web.com Tour Finals, finishing 24th in the priority ranking.