Electoral system for the president

Ecuador, Constitution (2008, last amended in 2018), accessed 9 February 2021

ARTICLE 143. Candidates to the office of the President and Vice-President of the Republic shall appear on the same voting ballot. The President or Vice-President shall be elected by absolute majority of the valid ballots that were cast. If, at the first round of voting, no electoral pair secures the absolute majority of votes, a second electoral round shall be held within the ensuing forty-five days, and the two electoral pairs who have obtained the highest number of votes in the first round shall participate in the second round. A second round of voting shall not be necessary if the electoral pair that obtained the highest ranking garners at least 40% of the valid votes and a difference of more than 10% of the number of votes obtained by the electoral pair ranking second.