Leagues A and B consist of teams with a license from the Voetbalfederatie Vlaanderen (VFV, the Dutch speaking wing of the Belgian FA), while league C contains teams with a license from the Association des Clubs Francophones de Football (ACFF, the French speaking wing of the RBFA).
In division B, only Hasselt applied for a license in spite of finishing just 5 points clear of the relegation zone.
The team finishing in second place in the Second Amateur Division C will take part in the promotion playoff first round together with three period winners.
The two winners of the Promotion play-offs on the VFV side (Mandel United and Sint-Eloois-Winkel) and the winning team from the ACFF Promotion play-offs (RFC Liège) will play a final tournament together with the team that finished in 14th place in the 2017–18 Belgian First Amateur Division (Hamme).
RFC Liège won 6–3 on aggregate and as a result was promoted to the 2018–19 Belgian First Amateur Division.
In case the three automatic relegation spots in the 2017–18 Belgian First Amateur Division are filled by: Additionally, in case the team from the 2017–18 Belgian First Amateur Division taking part in the Promotion play-offs Final belongs to a different wing than the winner of the Promotion play-offs Final, then an additional team would be relegated of the same wing as the relegating team from the 2017–18 Belgian First Amateur Division.
In the end, with the relegations of Hamme, Berchem Sport and Patro Eisden Maasmechelen from the 2017–18 Belgian First Amateur Division and the addition bankruptcy of Lierse (playing in the 2017–18 Belgian First Division B), which are all VFV teams, both Zwarte Leeuw and Pepingen-Halle were eventually relegated.