The Tasmanian Opposition wants the Australian Electoral Commission to investigate the state Liberal Party's financial records during Damien Mantach's tenure.

In 2008, the outgoing state director repaid $48,000 in personal expenses he racked up on the Liberal party's credit card.

Mr Mantach took up a position in Victoria and is now being investigated over $1.5 million in missing funds from that state's Liberal Party coffers.

Only a handful of senior Liberal Party figures, including Premier and then Liberal leader Will Hodgman, were told about Mr Mantach's use of Tasmanian members' funds at the time.

The payment to the Tasmanian branch from Mr Mantach was also not recorded on the party's 2007-08 electoral return lodged under the Australian Electoral Act.

Labor leader Bryan Green has written to the Commonwealth Electoral Commissioner seeking an investigation into the possible breach in 2008.

"Did the executive attempt to cover up the Mantach affair by failing to lodge a proper return?" Mr Green asked the Premier in State Parliament.

For a second day, the Premier faced questions about his role in the circumstances of Mr Mantach's departure.

"I think the people who have gone out and fundraised would be very annoyed, do you regret how this matter was handled in 2008, and what do you say to your members?" Mr Green said.

Mr Hodgman described the Opposition's line of questioning as "strange", arguing electoral returns only recorded details of donations made over a certain threshold.

The Premier told Parliament the public, including Liberal Party members, were more interested in health, education and the economy.

"Those are the matters that the people of Tasmania, whether they are Liberal or Labor members are talking to me about, they are not interested in Bryan Green's conspiracy theories or the very long bow he is drawing today," he said.