diff --git a/spec/system/admin/adjustments_spec.rb b/spec/system/admin/adjustments_spec.rb
index a88b0b4f15..688377a285 100644
--- a/spec/system/admin/adjustments_spec.rb
+++ b/spec/system/admin/adjustments_spec.rb
@@ -23,6 +23,10 @@ describe '
                       zone: create(:zone_with_member), tax_category: tax_category)
   }
 
+  let!(:tax_category_included) { create(:tax_category, name: 'TVA 20%', is_default: true) }
+  let!(:default_tax_zone) { create(:zone, default_tax: true) }
+  let!(:tax_rate2) { create(:tax_rate, name: "TVA 20%", amount: 0.2, zone: default_tax_zone, included_in_price: true, tax_category: tax_category_included, calculator: Calculator::DefaultTax.new ) }
+
   before do
     order.finalize!
     create(:check_payment, order: order, amount: order.total)
@@ -30,22 +34,84 @@ describe '
     visit spree.admin_orders_path
   end
 
-  it "adding taxed adjustments to an order" do
-    # When I go to the adjustments page for the order
-    page.find('td.actions a.icon-edit').click
-    click_link 'Adjustments'
+  shared_examples "when the enable_localized_number preference" do |adjustment_label, adjustment_amount, tax_category, tax, tax_total|
+    it "creates the adjustment and calculates taxes" do
+      # When I go to the adjustments page for the order
+      page.find('td.actions a.icon-edit').click
+      click_link 'Adjustments'
 
-    # And I create a new adjustment with tax
-    click_link 'New Adjustment'
-    fill_in 'adjustment_amount', with: 110
-    fill_in 'adjustment_label', with: 'Late fee'
-    select 'GST', from: 'adjustment_tax_category_id'
-    click_button 'Continue'
+      # And I create a new adjustment with tax
+      click_link 'New Adjustment'
+      fill_in 'adjustment_amount', with: adjustment_amount
+      fill_in 'adjustment_label', with: adjustment_label
+      select tax_category.to_s, from: 'adjustment_tax_category_id'
+      click_button 'Continue'
 
-    # Then I should see the adjustment, with the correct tax
-    expect(page).to have_selector 'td.label', text: 'Late fee'
-    expect(page).to have_selector 'td.amount', text: '110.00'
-    expect(page).to have_selector 'td.tax', text: '10.00'
+      # Then I should see the adjustment, with tax included in the amount
+      expect(page).to have_selector 'td.label', text: adjustment_label.to_s
+      expect(page).to have_selector 'td.amount', text: adjustment_amount.to_s
+      expect(page).to have_selector 'td.tax-category', text: tax_category.to_s
+      expect(page).to have_selector 'td.tax', text: tax.to_s
+      expect(page).to have_selector 'td.total', text: tax_total.to_s
+    end
+  end
+
+  context "is active" do
+    before do
+      allow(Spree::Config).to receive(:enable_localized_number?).and_return(true)
+    end
+
+    context "included tax" do
+      context "adding negative, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Discount", "-2", "TVA 20%", "$0.33", "$-1.67" do
+          before { pending("#10837") }
+        end
+      end
+
+      context "adding positive, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Late fee", "100", "TVA 20%", "$-16.67", "$83.33" do
+          before { pending("#10837") }
+        end
+      end
+    end
+
+    context "added tax" do
+      context "adding negative, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Discount", "-2", "GST", "$10.00", "$8.00" do
+          before { pending("#10837") }
+        end
+      end
+
+      context "adding positive, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Late fee", "110", "GST", "$10.00", "$120"
+      end
+    end
+  end
+
+  context "is not active" do
+    before do
+      allow(Spree::Config).to receive(:enable_localized_number?).and_return(false)
+    end
+
+    context "included tax" do
+      context "adding negative, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Discount", "-2", "TVA 20%", "$0.33", "$-1.67"
+      end
+
+      context "adding positive, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Late fee", "100", "TVA 20%", "$-16.67", "$83.33"
+      end
+    end
+
+    context "added tax" do
+      context "adding negative, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Discount", "-2", "GST", "$10.00", "$8.00"
+      end
+
+      context "adding positive, taxed adjustments to an order" do
+        it_behaves_like "when the enable_localized_number preference", "Late fee", "110", "GST", "$10.00", "$120"
+      end
+    end
   end
 
   it "modifying taxed adjustments on an order" do