The fundraising body that has embroiled cabinet secretary Arthur Sinodinos in a campaign finance scandal did not tell NSW authorities it received almost $1 million in donations - including from property developers - the year it gave $693,000 to the Liberal party for the 2011 state election.

The controversial Free Enterprise Foundation (FEF), whose donation to the NSW Liberals is the subject of an escalating dispute with the NSW electoral commission, told the state authority it received no donations in 2010-11.

But it had received $958,000 from companies including Westfield ($150,000), Meriton ($50,000) and Walker Group ($100,000) in the same year - a fact it had disclosed in a separate declaration to the federal Australian Electoral Commission.