Heavy hitters front Senate tax inquiry

CORPORATE TAX AVOIDANCE: WHO SAID WHAT

* CHEVRON AUSTRALIA says it hasn't engaged in any illegal activity or tax avoidance. It reckons it will contribute about $350 billion to government coffers once its Gorgon LNG project is up and running.

* UBER and AIRBNB say they pay their fair share of tax in Australia but are unable to divulge any details.

* UBER claim the ATO treats them unfairly and has "serious" questions to answer about deciding to apply the GST to ride-sharing drivers but Tax Commissioner Chris Jordan says that's misleading.

* ORIGIN ENERGY, SANTOS and WOODSIDE ENERGY say they don't have major issues with Australia's tax regime but agree changes need to be considered in an international context.

* SANTOS says it didn't pay tax in Australia last year because of the amount of money it has invested in the Gladstone LNG project

* WOODSIDE won't disclose what its tax rate is in Singapore, where it has a "marketing" hub, claiming it has made a loss since inception.

* BP supports a move to force multinationals operating in Australia to publish tax information but wants to decide how it's presented.