The Polish parliamentary election is scheduled to be held not later than November 2019. The previous election in 2015 was won by PiS. There is a 5% minimum threshold for individual parties and a 8% threshold for party alliances to gain mandates in the parliament. Between July 2015 and February 2016 the party alliance United Left (Democratic Left Alliance (SLD), Your Movement (TR), Polish Socialist Party (PPS), Labour United (UP), and The Greens (PZ)) was used by most pollsters instead of polling the individual parties. In the graph below, the values for the SLD in this time period are United left polling results or aggregates of the SLD and the TR numbers.
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