The thirteen teams were split across the two venues, with 7 teams competing in Tallinn and the other 6 competing in Esch-sur-Alzette. In Tallinn, the seven teams were split into two Pools of three and four teams with the teams finishing 1st and 2nd place in the pool competing in promotional playoffs for advancement to the Play-offs. In Esch-sur-Alzette, the nations were split into two pools of 3 teams, with the nations finishing first and second competing in promotional playoffs for advancement to the Play-offs. The nations finishing last in the each of the pools competed in relegation playoffs, with one nation from each venue relegated to Group II in 2022.[1]
The eight teams are split into two pools of 4. The 1st and 2nd placed teams of each pool will play-off to determine the nation advancing to Group I in 2022. The third and fourth placed teams will play-off to determine the nations relegated to Group III in 2022.[2]
The 21 teams are split into three pools of 4 teams and three pools of 3 teams. The 1st placed teams of each pool will play-off to determine the two nations advancing to Group II in 2022. [3]
Bold denotes the mandatory tournaments (WTA 1000) † – Tournaments are affected by the COVID-19 pandemic * – Tournaments are introduced due to the impact of the COVID-19 pandemic