The Tasmanian Liberal Party received a $50,000 donation from the Tasmanian Hospitality Association before the 2018 election but failed to declare the amount until this month.
The party recently lodged an amendment to its 2017-18 annual electoral disclosures with the Australian Electoral Commission recently.
This was after the commission found an oversight in the party's electoral disclosure which neglected to mention the Tasmanian Hospitality Association donation and $123,673 in credits from the Australian Tax Office.
The Tasmanian Hospitality Association had already declared the donation to the electoral commission.
Liberal Party state president Rod Scurrah said the two oversights were an administrative anomaly.
"The amendment was required to be lodged by 24th December as part of the AEC's compliance review, and demonstrates clearly that the existing triple-check system of donor disclosure-recipient disclosure-compliance review is working," he said.