[1] Ykkönen adopted a new league format for the 2020 season.
The number of teams was raised from ten to twelve, and promotion series and relegation series will be played after the regular season.
After the regular season the top six teams advanced to the Promotion Series which determines the champion and Veikkausliiga promotion places.
The bottom six teams advanced to the relegation series.
[2] A total of twelve teams will contest in the league, including seven sides from the 2019 season, VPS and KPV were relegated from Veikkausliiga and Gnistan, MP and SJK Akatemia who were promoted from Kakkonen after winning the promotion play-offs.