diff --git a/app/controllers/admin/business_model_configuration_controller.rb b/app/controllers/admin/business_model_configuration_controller.rb
index 0ac2a00eb7..e421b2e597 100644
--- a/app/controllers/admin/business_model_configuration_controller.rb
+++ b/app/controllers/admin/business_model_configuration_controller.rb
@@ -1,3 +1,30 @@
-class Admin::BusinessModelConfigurationController < Spree::Admin::BaseController
+require 'open_food_network/business_model_configuration_validator'
 
+class Admin::BusinessModelConfigurationController < Spree::Admin::BaseController
+  before_filter :load_settings, only: [:edit, :update]
+  before_filter :require_valid_settings, only: [:update]
+
+  def update
+    Spree::Config.set(params[:settings])
+    flash[:success] = t(:successfully_updated, :resource => t(:business_model_configuration))
+    redirect_to_edit
+  end
+
+  private
+
+  def redirect_to_edit
+    redirect_to main_app.edit_admin_business_model_configuration_path
+  end
+
+  def load_settings
+    @settings = OpenFoodNetwork::BusinessModelConfigurationValidator.new(params[:settings] || {
+      account_invoices_monthly_fixed: Spree::Config[:account_invoices_monthly_fixed],
+      account_invoices_monthly_rate: Spree::Config[:account_invoices_monthly_rate],
+      account_invoices_monthly_cap: Spree::Config[:account_invoices_monthly_cap]
+    })
+  end
+
+  def require_valid_settings
+    render :edit unless @settings.valid?
+  end
 end
diff --git a/lib/open_food_network/business_model_configuration_validator.rb b/lib/open_food_network/business_model_configuration_validator.rb
new file mode 100644
index 0000000000..292894daea
--- /dev/null
+++ b/lib/open_food_network/business_model_configuration_validator.rb
@@ -0,0 +1,19 @@
+# This class is a lightweight model used to validate preferences for business model configuration
+# when they are submitted to the BusinessModelConfigurationController
+
+module OpenFoodNetwork
+  class BusinessModelConfigurationValidator
+    include ActiveModel::Validations
+
+    attr_accessor :account_invoices_monthly_fixed, :account_invoices_monthly_rate, :account_invoices_monthly_cap
+
+    validates :account_invoices_monthly_fixed, presence: true, numericality: { greater_than_or_equal_to: 0 }
+    validates :account_invoices_monthly_rate, presence: true, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 1 }
+    validates :account_invoices_monthly_cap, presence: true, numericality: { greater_than_or_equal_to: 0 }
+
+    def initialize(attr, button=nil)
+      attr.each { |k,v| instance_variable_set("@#{k}", v) }
+      @button = button
+    end
+  end
+end
diff --git a/spec/controllers/admin/business_model_configuration_controller_spec.rb b/spec/controllers/admin/business_model_configuration_controller_spec.rb
index df80bce9e6..7aed5cfbf7 100644
--- a/spec/controllers/admin/business_model_configuration_controller_spec.rb
+++ b/spec/controllers/admin/business_model_configuration_controller_spec.rb
@@ -1,9 +1,17 @@
 require 'spec_helper'
 
-describe Admin::AccountsAndBillingSettingsController, type: :controller do
+describe Admin::BusinessModelConfigurationController, type: :controller do
   let(:user) { create(:user) }
   let(:admin) { create(:admin_user) }
 
+  before do
+    Spree::Config.set({
+      account_invoices_monthly_fixed: 5,
+      account_invoices_monthly_rate: 0.02,
+      account_invoices_monthly_cap: 50
+    })
+  end
+
   describe "edit" do
     context "as an enterprise user" do
       before { allow(controller).to receive(:spree_current_user) { user } }
@@ -23,4 +31,53 @@ describe Admin::AccountsAndBillingSettingsController, type: :controller do
       end
     end
   end
+
+  describe "update" do
+    context "as an enterprise user" do
+      before { allow(controller).to receive(:spree_current_user) { user } }
+
+      it "does not allow access" do
+        spree_get :update
+        expect(response).to redirect_to spree.unauthorized_path
+      end
+    end
+
+    context "as super admin" do
+      before {allow(controller).to receive(:spree_current_user) { admin } }
+      let(:params) { { settings: { } } }
+
+      context "when settings are invalid" do
+        before do
+          params[:settings][:account_invoices_monthly_fixed] = ''
+          params[:settings][:account_invoices_monthly_rate] = '2'
+          params[:settings][:account_invoices_monthly_cap] = '-1'
+          spree_get :update, params
+        end
+
+        it "does not allow them to be set" do
+          expect(response).to render_template :edit
+          expect(assigns(:settings).errors.count).to be 4
+          expect(Spree::Config.account_invoices_monthly_fixed).to eq 5
+          expect(Spree::Config.account_invoices_monthly_rate).to eq 0.02
+          expect(Spree::Config.account_invoices_monthly_cap).to eq 50
+        end
+      end
+
+      context "when required settings are valid" do
+        before do
+          params[:settings][:account_invoices_monthly_fixed] = '10'
+          params[:settings][:account_invoices_monthly_rate] = '0.05'
+          params[:settings][:account_invoices_monthly_cap] = '30'
+        end
+
+        it "sets global config to the specified values" do
+          spree_get :update, params
+          expect(assigns(:settings).errors.count).to be 0
+          expect(Spree::Config.account_invoices_monthly_fixed).to eq 10
+          expect(Spree::Config.account_invoices_monthly_rate).to eq 0.05
+          expect(Spree::Config.account_invoices_monthly_cap).to eq 30
+        end
+      end
+    end
+  end
 end