Bill was included in the Australian squad to tour South Africa as a 19-year-old in 1950 as back-up goalkeeper to Norman Conquest. He enjoyed a representative career that extended to more than eight years and included 14 appearances for Australia, eight games for NSW and seven matches for Northern NSW against touring international sides.
Bill’s A international appearance came against South Africa in Adelaide in September 1955.
Bill played in northern NSW alongside the likes of Alf Quill and Reg Date. In addition to Wallsend, Bill played for Adamstown Rosebud and Weston before finishing out his senior career at Dudley.
He was inducted into the Hunter Region Sporting Hall of Fame in 2007. Following his retirement, Bill contributed off the pitch as a director of Northern NSW Soccer Federation from 1973 to 1981 and again from 1987 to 1991.
Northern NSW Football’s annual National Premier Leagues Men's Goalkeeper of the Year Award is presented in Bill’s name to honour his achievements.
Bill Mahoney Goalkeeper of the Year
| Season | Player | Team |
| 2025 | Ben Conway | Edgeworth Eagles |
| 2024 | Ben Kennedy | Lambton Jaffas |
| 2023 | Ben Kennedy | Lambton Jaffas |
| 2022 | Nathan Archbold | Charlestown Azzurri |
| 2021 | Ben Kennedy | Lambton Jaffas |
| 2020 | Nathan Archbold | Charlestown Azzurri |
| 2019 | Nathan Archbold | Charlestown City Blues |
| 2018 | Paul Bitz | Broadmeadow Magic |
| 2017 | Nate Cavaliere | Edgeworth Eagles |
| 2016 | Danny Ireland | Hamilton Olympic |
| 2015 | Tim Pratt | Weston Workers FC |
| 2014 | Jim Fogarty | Edgeworth Eagles |
2013 | Brad Swancott | Hamilton Olympic |