The make-up of the Senate could be even more complicated after the July 2 election with predictions of a larger crossbench than that which Malcolm Turnbull tried to eradicate by changing the voting rules and calling a full-Senate election.

The analysis, conducted by The Australia Institute, is supported by a separate assessment by ABC election expert Antony Green, and is based largely on voting intention in published polls.

The most likely scenario at this stage is that after the election, there will be nine Senate crossbenchers, of which up to six, and a minium four, will belong to the Nick Xenophon Team (NXT). This would be one more than the old eight-member crossbench.

Pauline Hanson is back, this time running for the Senate.

The Coalition is on track to lose one senator and drop to 32 spots. Labor, which now has 25 senators, could end up with 26 while the Greens will lose one in South Australia to reduce their total to 9.

To pass legislation through the Senate, a government needs 39 votes. If the Coalition wins the election, it will need the support of either Labor, the Greens or seven members of the crossbench. Senator Xenophon will become a key player because his bloc of votes will be critical to delivering the third option.