[2] His father was institutionalized in the Royal India Asylum when he was a boy,[3] and at the age of 14 Dibbs entered the service of the Commercial Banking Company of Sydney as a junior clerk.
In 1877 Dibbs published a booklet Interest Tables and established some important banking practices in Sydney.
In 1916 he presented his house, Graythwaite, North Sydney, to the Commonwealth for a home for sick and wounded soldiers.
He built up a fine staff from which he had complete loyalty, and he guided the affairs of his bank with ability for a period which was probably record-breaking.
For many years Dibbs was the trusted confidential adviser in financial matters of the various New South Wales governments, and when he retired in 1915 the government of the state presented an address to him expressing "profound recognition of the invaluable services rendered by him to vital public interests .