First of all, I can provide you with the multipliers that have been used by the Department of Finance for personal income tax measures, which are basically 0.2 over the short term and 0.6 over the longer term. These are relatively low multipliers, and if you apply them to the net personal income tax measure effect in dollar value, which for 2016-17 is about $1.3 billion, I assume you end up with less than 0.5% percentage points, which probably explains this. When you round that, you get to the zero in this publication.
On April 12th, 2016. See this statement in context.