[1] Voting for the Parliament was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered in the Basque Country and in full enjoyment of their political rights.

The 75 members of the Basque Parliament were elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of five percent of valid votes[b] being applied in each constituency.

[1][2] After legal amendments in 1981, the lehendakari was granted the prerogative to dissolve the Basque Parliament at any given time and call a snap election, provided that no motion of no confidence was in process.

The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.

The table below lists opinion polling on the perceived likelihood of victory for each party in the event of a regional election taking place.