The party's powerful administrative committee met on Monday morning, agreeing on guidelines for the conduct of the ballot.

Franklin MHA David O'Byrne and Braddon MHA Shane Broad are the two contenders for the job, after former leader Rebecca White stood down in the wake of the party's third consecutive election loss.

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"The vast majority of party members will be provided the opportunity to vote online in the privacy of their own home, using a secure online voting system," Tasmanian Labor state secretary Stuart Benson said.

The vote will be split 50-50 between the party's eligible rank-and-file members and the delegates to Tasmanian Labor's state conference.

There are about 1000 rank-and-file members eligible to vote for the leadership, while there were 215 delegates to the party's last conference in 2019.

"This is an historic opportunity for participatory democracy within our party, which has a proud history of giving members a voice in critical decision-making," Mr Benson said.

"Party members will be able to engage directly with the leadership candidates and will also have the opportunity to engage in a state-wide online forum to hear about each of the candidates' positive plans for our party."

Members of Labor's Right faction sought to have five separate leadership debates organised in each electorate before June 15, but it's understood the Left-controlled administrative committee did not support the idea.

Postal ballot papers were issued to eligible members on Monday via Australia Post. On Friday, online ballots will be issued.

The ballot closes at 5pm on Tuesday, June 15, allowing for a 22-day voting period for members voting via post and an 18-day period for those voting online. Labor's state returning officer will begin counting the votes at 5.30pm that evening, with scrutineers present.

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