diff --git a/app/jobs/scheduled/tl3_promotions.rb b/app/jobs/scheduled/tl3_promotions.rb
index 9de8f711d43..3d717d9f675 100644
--- a/app/jobs/scheduled/tl3_promotions.rb
+++ b/app/jobs/scheduled/tl3_promotions.rb
@@ -22,6 +22,19 @@ module Jobs
             # Don't demote too soon after being promoted
             next if u.on_tl3_grace_period?
 
+            modifier_applied, demoted_user_id =
+              DiscoursePluginRegistry.apply_modifier(
+                :tl3_custom_demotions,
+                false,
+                u,
+                demoted_user_ids,
+              )
+
+            if modifier_applied
+              demoted_user_ids << demoted_user_id
+              next
+            end
+
             if Promotion.tl3_lost?(u)
               demoted_user_ids << u.id
               Promotion.new(u).change_trust_level!(TrustLevel[2])
@@ -29,6 +42,10 @@ module Jobs
           end
       end
 
+      override =
+        DiscoursePluginRegistry.apply_modifier(:tl3_custom_promotions, false, demoted_user_ids)
+      return override if override
+
       # Promotions
       User
         .real
diff --git a/spec/jobs/tl3_promotions_spec.rb b/spec/jobs/tl3_promotions_spec.rb
index 28fc7439591..48e16a652f2 100644
--- a/spec/jobs/tl3_promotions_spec.rb
+++ b/spec/jobs/tl3_promotions_spec.rb
@@ -14,6 +14,10 @@ RSpec.describe Jobs::Tl3Promotions do
 
   subject(:run_job) { described_class.new.execute({}) }
 
+  let!(:plugin) { Plugin::Instance.new }
+  let!(:allow_block) { Proc.new { true } }
+  let!(:array_block) { Proc.new { [true, 1] } }
+
   it "promotes tl2 user who qualifies for tl3" do
     tl2_user = Fabricate(:user, trust_level: TrustLevel[2])
     create_qualifying_stats(tl2_user)
@@ -43,6 +47,26 @@ RSpec.describe Jobs::Tl3Promotions do
     run_job
   end
 
+  it "allows plugins to control tl3_promotion's promotions" do
+    DiscoursePluginRegistry.register_modifier(plugin, :tl3_custom_promotions, &allow_block)
+    TrustLevel3Requirements.any_instance.stubs(:requirements_met?).never
+    tl2_user = Fabricate(:user, trust_level: TrustLevel[2])
+    create_qualifying_stats(tl2_user)
+    run_job
+  ensure
+    DiscoursePluginRegistry.unregister_modifier(plugin, :tl3_custom_promotions, &allow_block)
+  end
+
+  it "allows plugins to control tl3_promotion's demotions" do
+    DiscoursePluginRegistry.register_modifier(plugin, :tl3_custom_demotions, &array_block)
+    TrustLevel3Requirements.any_instance.stubs(:requirements_lost?).never
+    Fabricate(:user, trust_level: TrustLevel[3])
+
+    run_job
+  ensure
+    DiscoursePluginRegistry.unregister_modifier(plugin, :tl3_custom_demotions, &array_block)
+  end
+
   context "with tl3 user who doesn't qualify for tl3 anymore" do
     def create_leader_user
       user = Fabricate(:user, trust_level: TrustLevel[2])