Reserve Bank Governor Phillip Lowe will join the treasurer to represent Australia virtually on Friday night at the Group of 20 session in Venice, which aims to lock in a bigger corporate tax haul for governments.

The meeting will be the first hybrid virtual and face-to-face gathering of G20 finance ministers and central bank governors since the onset of the pandemic.

It will also be secretary-general Mathias Cormann's first address to the G20 as head of the OECD.

The meeting is expected to endorse a two-pillar approach to international tax reform wrangled by 130 countries over the past two years, with conditions that favour Australia.

The "fairer and more stable global tax system" will suit Australia's resource-rich economy, with a carve out for oil, gas and minerals.

The treasurer will welcome the exclusion of "extractives and regulated financial services" from so-called pillar one.

The new approach will change the way income and taxing rights work across the global economy.

The pillar one stage seeks greater taxing rights in the jurisdiction where the consumer, rather than the producer, is located.

The carve out means Australia retains the taxing rights over profits from Australia's commodities exports, which under pillar one could have been reallocated from Australia to market jurisdictions such as China - Australia's biggest customer.

"There are strong and principled reasons to exclude these industries. Their exclusion represents a critical foundation of the agreement," Mr Frydenberg will say.

Australia has also ensured that this carve out will not be examined as part of the seven-year post implementation review expected to be part of the agreement.

In another swipe at China, he will urge G20 members to promote and stand behind the open, rules-based trading system.

"The G20 must lead the way in fighting protectionism and rolling back restrictive trade measures."

Countries will also discuss the significant ongoing economic risks from the pandemic, alongside the health risks of COVID-19 and its variants.

"We must continue to support the global economy until the recovery is locked in," he will urge his peers.

"Higher debt levels around the world remain a key vulnerability in the global recovery and we must work together to ensure greater debt transparency which is critical to expose and resolve vulnerabilities."

Large debt burdens in both public and private sector could be the biggest impediment to the recovery.

The tax deal aims to see the new architecture roll out in 2022 and 2023.

Pillar two changes are expected to help Australia attract and retain investment by lessening the gap between countries' tax rates on multinational businesses.

Pillar two brings the global minimum tax of at least 15 per cent, as agreed by leaders from the G7 in Cornwall last month.

The OECD estimates that the combination of pillar one and pillar two could generate an additional 50 billion to 80 billion euros ($80 billion to $130 billion) a year in global tax revenue.

Australian Associated Press