The first concerns the attacking bonus point. Instead of being awarded for scoring four or more tries, teams will now only earn a try-scoring bonus point if they finish the match with at least three more tries than their opponents.
The system, already in use in France's Top 14 and Super Rugby, is designed to encourage attacking rugby throughout the full 80 minutes while keeping contests alive for longer.
Explaining the change, EPCR said: "The purpose of this change is to reward teams who continue to play attacking rugby and who remain resolute in defence once victory appears certain, effectively ensuring tournament matches stay competitive for longer.
"The change will also enable teams to deny their opponents an offensive bonus point if their defensive intensity drops. The status of the offensive bonus will remain uncertain until the conclusion of each fixture."
The losing bonus point for teams beaten by seven points or fewer remains unchanged.
EPCR has also overhauled the qualification format for the last-16 stage.
Under the previous system, the top four teams from each of the competition's four pools of six qualified automatically for the knockout rounds. From the 2026/27 season onwards, only the top three teams in each pool will secure automatic qualification.
The remaining four places in the last 16 will be awarded to the best-performing teams across all four pools based on match points, regardless of their final pool position.
The change is designed to avoid a repeat of last season, when Leicester Tigers and the Bulls progressed after finishing fourth in their respective pools with one win each, while the Sharks missed out despite winning two matches after finishing fifth in their group.
The changes were confirmed ahead of Wednesday's pool stage draw for the 2026/27 competitions, when Glasgow Warriors will learn their Champions Cup opponents.