Three teams will be relegated from the National League this season and four teams promoted into it to bring it back up to 24 teams.
Just one team will be relegated from both National Leagues North and South.
From the 2022-23 season, both of those divisions will increase to 24 rather than 22 teams.
Last season was declared null and void in the sixth tier and below because of the coronavirus pandemic, meaning no teams were relegated from the National League in 2020-21.