Extending the banking royal commission and giving indigenous people better land rights are the keys to Prime Minister Scott Morrison winning independent MP Bob Katter's support.

Numbers are deadlocked in the lower house while the by-election for Malcolm Turnbull's old seat of Wentworth is held, putting Mr Morrison under pressure to keep crossbench MPs onside.

Mr Katter has met with Mr Morrison and promised not to vote for no confidence motions.

But the veteran Queensland MP wants to see an extension of the banking inquiry and title deeds for first Australians.

"I want to see whether he's going to be fair dinkum about these policies, and if not I will withdraw my support, as I did for Turnbull," Mr Katter told Sky News on Thursday.