Tim Wilson holds undisclosed shares in climate advisory firm through family trust

Tim Wilson's investment trust holds 15,000 shares in a climate advisory firm that trades on a scheme the Coalition has vowed to scrap. (ABC News: David Sciasci)

Tim Wilson's investment trust holds shares in a climate advisory firm named Gondwana Carbon, which trades carbon credits under a scheme the Coalition has vowed to scrap.

Mr Wilson has rejected that he should have disclosed those shares, saying the trust which holds them has been declared.

MPs are required to notify interests in any shares, including those held indirectly.

Shadow Treasurer Tim Wilson holds undisclosed shares in a climate advisory firm through his family investment trust, ASIC records show.

While Mr Wilson has disclosed his directorship of two trusts — an investment trust with his partner Ryan Bolger and a holding company named Dynamic Sunrise — shares held in those trusts were not disclosed on his parliamentary register.

MPs are required to notify interests in any shares, including those held indirectly through a trust or self-managed superannuation fund.

Mr Wilson's investment trust holds 15,000 shares in a small company called Gondwana Carbon, which helps companies to develop emissions reduction projects, earn carbon credits and then trade them.

The climate advisory says it has traded more than 372,000 carbon credits, including trades through the "Safeguard Mechanism" credit scheme for big polluters, a scheme the Coalition has vowed to scrap.

Gondwana Carbon also promotes the opportunity for landowners to make money from the push towards net zero emissions.

"The drive towards net zero is a significant opportunity to reduce the impacts of global warming by developing high-quality carbon emissions reduction and removal projects at scale," Gondwana said on its site.

Gondwana Carbon helps develop carbon emissions reduction projects and trade credits from those projects. (Gondwana Carbon)

The now-shadow treasurer's trust held a directorship of Gondwana Carbon until May 29 last year, 26 days after Mr Wilson's second election to parliament.

While that directorship ceased, the shares continue to be held.

Mr Wilson, through a spokesperson, refuted the need to disclose shares held in his family trust.

"Mr Wilson's declarations are in order. Mr Wilson has declared the trust. Mr Wilson has not owned those shares," the spokesperson said.

MPs are required to "notify any relevant interest in any shares" whether held directly or indirectly, and "this includes shares held by a family or business trust", according to the rules for MP statements of registrable interests.

Mr Wilson