1928 was the year postal voting was introduced for certain specified groups (e.g. invalids) who could not get to a polling booth on election day.
In 1927, a faction of the decaying Liberal Party formed a new organisation, which was eventually named the United Party. In 1928, to the considerable surprise of most observers and many members of the party itself, United won a considerable victory, taking Auckland East and Grey Lynn from Labour. The United Government came to power, and Labour, the official opposition since 1926, was replaced by Reform.
The 1928 election was held on Tuesday, 13 November in the Māori electorates, and on Wednesday, 14 November in the general electorates to elect a total of 80 MPs to the 23rd session of Parliament. A total of 844,633 electors were registered on the European roll, of which 743,691 (88.05%) turned out to vote. All 80 electorates were contested. 47 and 29 electorates were in the North Island and South Island, respectively, plus the 4 Māori electorates.
The table below shows the result of the 1928 election. The Bay of Islands electorate went to Harold Rushworth of the Country Party after a recount of the votes, but the election was declared void January 1929. Rushworth won the resulting by-election.