Treasurer Mike Nahan said today Western Australia might get an extra $660 million from Canberra to make up for the shortfall in GST grants but conceded the amount, timing and use of the funds, were all yet to be decided.

Treasurer Mike Nahan said today Western Australia might get an extra $660 million from Canberra to make up for the shortfall in GST grants but conceded the amount, timing and use of the funds, were all yet to be decided.