International taxation

As client is ROR global income is taxable in India as per IT act.\

Moreover India - Australlia DTAA clause 15 says 

 Notwithstanding the provisions of paragraph (1), remuneration derived by an individual who is a resident of one of the Contracting States in respect of an employment exercised in the other Contracting State shall be taxable only in the first-mentioned State if :

(a) the recipient is present in that other State for a period or periods not exceeding in the aggregate 183 days in a year of income of that other State;

(b) the remuneration is paid by, or on behalf of, an employer who is not a resident of that other State; and

(c) the remuneration is not deductible in determining taxable profits of a permanent establishment or a fixed base which the employer has in that other State.

As you have mentioned that he is Resident so  2nd condition is violated .

So no doubt it will be taxed in India