diff --git a/app/models/spree/adjustment.rb b/app/models/spree/adjustment.rb
index 942e7fc149..f5e5fe0707 100644
--- a/app/models/spree/adjustment.rb
+++ b/app/models/spree/adjustment.rb
@@ -70,6 +70,8 @@ module Spree
     scope :charge, -> { where('amount >= 0') }
     scope :credit, -> { where('amount < 0') }
     scope :return_authorization, -> { where(source_type: "Spree::ReturnAuthorization") }
+    scope :included, -> { where(included: true) }
+    scope :additional, -> { where(included: false) }
 
     scope :enterprise_fee, -> { where(originator_type: 'EnterpriseFee') }
     scope :admin,          -> { where(source_type: nil, originator_type: nil) }
diff --git a/spec/models/spree/adjustment_spec.rb b/spec/models/spree/adjustment_spec.rb
index 1f77bd725b..cced77f9e8 100644
--- a/spec/models/spree/adjustment_spec.rb
+++ b/spec/models/spree/adjustment_spec.rb
@@ -460,5 +460,34 @@ module Spree
     context "extends LocalizedNumber" do
       it_behaves_like "a model using the LocalizedNumber module", [:amount]
     end
+
+    describe "included and additional scopes" do
+      let!(:zone) { create(:zone_with_member) }
+      let(:order) { create(:order) }
+      let(:included_in_price) { true }
+      let(:tax_rate) {
+        create(:tax_rate, included_in_price: included_in_price,
+                          calculator: ::Calculator::FlatRate.new(preferred_amount: 0.1))
+      }
+      let(:included) { true }
+      let(:adjustment) {
+        create(:adjustment, adjustable: order, source: order,
+                            originator: tax_rate, included: included)
+      }
+
+      context "when tax is included in price" do
+        it "is returned by the #included scope" do
+          expect(Spree::Adjustment.included).to eq [adjustment]
+        end
+      end
+
+      context "when tax is additional to the price" do
+        let(:included) { false }
+
+        it "is returned by the #additional scope" do
+          expect(Spree::Adjustment.additional).to eq [adjustment]
+        end
+      end
+    end
   end
 end