The Personal Property Securities Amendment Regulation 2012 (No. 1) was registered on 28 June 2012, prescribing the following as investment instruments:

• an Australian carbon credit unit, within the meaning of section 5 of the Carbon Credits (Carbon Farming Initiative) Act 2011;
• a carbon unit, within the meaning of section 5 of the Clean Energy Act 2011;
• each eligible international emissions unit mentioned in paragraphs (a), (b), (c) and (d) of the definition of eligible international emissions unit in section 4 of the Australian National Registry of Emissions Units Act 2011.

An investment instrument is a type of financial property over which security may registered under the Personal Property Securities Act.

In order to assist in the understanding of how the PPS Act applies to carbon pricing the PPSR has issued an information sheet.