| Regimental number | 1739 |
| Place of birth | Ballarat Victoria |
| Religion | Presbyterian |
| Occupation | Labourer |
| Address | 175 Eureka Street, Ballarat East, Victoria |
| Marital status | Single |
| Age at embarkation | 26 |
| Next of kin | Mother, Mrs Helen McKay, 175 Eureka Street, Ballarat East, Victoria |
| Enlistment date | 5 February 1916 |
| Rank on enlistment | Private |
| Unit name | 57th Battalion, 2nd Reinforcement |
| AWM Embarkation Roll number | 23/74/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A14 Euripides on 4 April 1916 |
| Rank from Nominal Roll | Private |
| Fate | Returned to Australia 27 July 1917 |
| Miscellaneous details (Nominal Roll) | 58th Bn |
| Family/military connections | Brother: 17637 Pte John McKAY, 6th Field Ambulance, returned to Australia, 23 June 1919. |
| Sources | NAA: B2455, McKAY Donald |