2015 Budget: Commonwealth bond supply follows the Hockey curve 13 May 2015 4:21PM Ian Rogers The value of Commonwealth Government securities on issue, subject to the Treasurer's direction, is expected to jump by more than A$100 million over the next three financial years, last night's 2015 Budget papers show.CGS will rise from around $412 billion at June 2016 to $518 by mid 2019, Treasury forecast.One offset will be further sales of the Government's residual holdings of residential mortgage‑backed securities. At the end of April the Government's RMBS portfolio was valued at $4.6 billion."Subject to market conditions, it is estimated that the RMBS portfolio could be sold down by the middle of 2016," the Budget paper shows.