A lobbying firm part-owned by Liberal powerbroker Michael Photios made donations worth almost $100,000 to the Liberal and National parties before last year's federal election.

But Premier State Consulting failed to declare the donations until last month – seven months after the official Australian Electoral Commission reporting date of November 17, 2013 and nine months after Tony Abbott's new Liberal-Nationals government took power, which Premier State is registered to lobby on behalf of private clients.

Big donor: Michael Photios. Credit:Simon Alekna

The late disclosure is all the more notable as Premier State is run by political professionals. Mr Photios is a former vice-president of the NSW Liberal Party.

His business partner, Nick Campbell, is a former NSW Liberal president, while another director and part-owner, David Begg, served on the NSW Liberal state executive from 1996 to 2001 and 2008 to 2011.