Australia's major political parties failed to properly disclose $135,000 of donations made during an election year, including $40,000 made by a firm of corporate spin doctors.

Documents released overnight by the Australian Electoral Commission show Labor, the Liberals and Greens failed to declare the money during the 2013/14 financial year.

The donations were made during the financial year that covered the 2013 federal election. Credit:Max Mason-Hubers

Failing to disclose donations can result in significant fines for the party and donor.

The documents reveal the Liberal Party's NSW division has only recently corrected details of a $40,000 contribution from corporate giant STW Communications.