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Australia has one of the highest levels of invalid votes among the established liberal democracies. Three hypotheses have been put forward to account for variations in turnout—that it results from institutional factors, differing patterns of social structure, or reflects political protest by voters. These hypotheses are used to explain informal voting in Australia's compulsory voting system. The data are national polling booth results for the 1987 and 1990 federal elections, and polling booth results from New South Wales matched to the 1986 census. The results reject the institutional and protest hypotheses, but support the social structural hypothesis. In particular, immigrants who are recently arrived and have poor English skills are significantly more likely to spoil their votes. Australia's high level of invalid votes is therefore explained by the interaction between compulsory voting, the complexity of the electoral system, and by …