diff --git a/app/models/standing_order_order.rb b/app/models/standing_order_order.rb
index 0ecdfd32e3..c2c93c3721 100644
--- a/app/models/standing_order_order.rb
+++ b/app/models/standing_order_order.rb
@@ -1,4 +1,14 @@
 class StandingOrderOrder < ActiveRecord::Base
   belongs_to :order, class_name: 'Spree::Order', dependent: :destroy
   belongs_to :standing_order
+
+  def cancel
+    transaction do
+      if order.order_cycle.orders_close_at > Time.zone.now
+        self.update_column(:cancelled_at, Time.zone.now)
+        order.send('cancel') if order.complete?
+      end
+      self
+    end
+  end
 end
diff --git a/spec/models/standing_order_order_spec.rb b/spec/models/standing_order_order_spec.rb
new file mode 100644
index 0000000000..663432a6dd
--- /dev/null
+++ b/spec/models/standing_order_order_spec.rb
@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe StandingOrderOrder, type: :model do
+  describe "cancel" do
+    let(:order_cycle) { create(:simple_order_cycle) }
+    let(:standing_order) { create(:standing_order, orders: [order]) }
+    let(:standing_order_order) { standing_order.standing_order_orders.first }
+
+    context "when the order cycle for the order is not yet closed" do
+      before { order_cycle.update_attributes(orders_open_at: 1.day.ago, orders_close_at: 3.days.from_now) }
+
+      context "and the order has already been completed" do
+        let(:order) { create(:completed_order_with_totals, order_cycle: order_cycle) }
+
+        it "sets cancelled_at to the current time, and cancels the order" do
+          standing_order_order.cancel
+          expect(standing_order_order.reload.cancelled_at).to be_within(5.seconds).of Time.now
+          expect(order.reload.state).to eq 'canceled'
+        end
+      end
+
+      context "and the order has not already been completed" do
+        let(:order) { create(:order, order_cycle: order_cycle) }
+
+        it "just sets cancelled at to the current time" do
+          standing_order_order.cancel
+          expect(standing_order_order.reload.cancelled_at).to be_within(5.seconds).of Time.now
+          expect(order.reload.state).to eq 'cart'
+        end
+      end
+    end
+
+    context "when the order cycle for the order is already closed" do
+      let(:order) { create(:order, order_cycle: order_cycle) }
+
+      before { order_cycle.update_attributes(orders_open_at: 3.days.ago, orders_close_at: 1.minute.ago) }
+      it "does nothing" do
+        standing_order_order.cancel
+        expect(standing_order_order.reload.cancelled_at).to be nil
+        expect(order.reload.state).to eq 'cart'
+      end
+    end
+  end
+end