| Regimental number | 14307 |
| Occupation | Labourer |
| Next of kin | Brother, T McMahon, Kumbudgee, Queensland, Australia |
| Rank on embarkation | Rifleman |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, New Zealand Rifle Brigade, 8th Reinforcements to 1st Battalion, E Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT Maunganui on |
| Final rank | Private |
| Final unit | 1st Battalion, Auckland Infantry Regiment |
| Fate | Died of wounds |
| Age at death from cemetery records | 33 |
| Place of burial | Brookwood Military Cemetery (Plot VIII, Row D, Grave No 7), Pirbright, Surrey, England |
| Miscellaneous information from cemetery records | Brother: Thomas McMahon, Goombungee, Queensland, Australia |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 2: Roll 34, p. 29 |