The tickets donated by a Beatles fan in Melbourne were instead used by the daughter of the Christian charity's head, after two tickets were allegedly returned just hours before event.
The donor who gave a total of seven tickets to the charity, complained when he spotted Major Brendan Nottle's daughter at the show.
Chris McDonald told The Age newspaper it took him more than a year to save up to buy the tickets, which cost about A$2,350 (£1,360).
He said he had been homeless himself as a young man, and wanted to "give something to people who need a lift".
Major Nottle defended using the tickets and told Australian radio station 3AW that he had no role in giving the tickets to his daughter.
He added: To be blunt, do homeless people need tickets to Paul McCartney or do they need a roof over their head?"
The Salvation Army, which is one of Australia's largest charitable organisations has apologised to Mr McDonald and will reimburse him for all seven tickets.
