Each FIN1 team plays Home/Away matches against the other 11 FIN1 teams for a total of 22 regular season league matches. At the end of regular season, the top 6 teams play in the Championship Series, while the bottom 6 teams play in the Relegation Series. For each series, each team plays against the other 5 teams in their group once for 5 more matches (27 total league matches). Table ranking ties are broken by (1) goal difference, (2) goals scored, (3) head-to-head points, (4) head-to-head goal difference, (5) head-to-head away goals scored, then (6) a playoff (only to decide a champion).

Upon completion of the 2023 FIN1 Championship and Relegation Rounds, the 4th place Championship Round team plays the 1st place Relegation Series team, and the 5th and 6th place Championship Round teams play each other in the 1st Round of the UEFA Europa Conference League Playoffs. The winners of the 1st Round, meet in the 2nd Round. The 2nd Round winner plays the 3rd place Championship Round team in the UEFA Europa Conference League Playoff final. The winner of the final receives a berth in the 2024 UEFA Europa League - 1st Qualifying Round.

At the end of the 2023 FIN1 Regular season, the 6th place FIN1 Relegation Round team is relegated to the FIN2, and the 5th place FIN1 Relegation Round team plays Home-Away highest aggregate goals wins playoff matches with the 2nd place FIN2 team. The playoff winner and the 1st place FIN2 play in the 2024 FIN1.