Poles have begun voting in a referendum on the voting system, the funding of political parties and taxation.

The vote Sunday was set by former President, Bronislaw Komorowski, after a surprisingly poor showing in the first round of the presidential election in May. He lost the final round to new conservative President Andrzej Duda.

The referendum asks voters if they want to introduce a single-seat constituency system for the lower house of parliament, whether to end public funding for political parties from and whether disputes between taxpayers and the authorities should be resolved in favor of the taxpayers.

At least 50 percent of registered voters must cast ballots for the result to be valid.