diff --git a/app/assets/javascripts/controllers/admin/invoices.js.erb b/app/assets/javascripts/controllers/admin/invoices.js.erb
index c0adeafbb..0cbecd94a 100644
--- a/app/assets/javascripts/controllers/admin/invoices.js.erb
+++ b/app/assets/javascripts/controllers/admin/invoices.js.erb
@@ -392,7 +392,10 @@ Application.Controllers.controller('InvoicesController', ['$scope', '$state', 'I
       $uibModal.open({
         templateUrl: '<%= asset_path "admin/invoices/closePeriodModal.html" %>',
         controller: 'ClosePeriodModalController',
-        size: 'lg'
+        size: 'lg',
+        resolve: {
+
+        }
       });
     }
 
@@ -614,12 +617,12 @@ Application.Controllers.controller('AvoirModalController', ['$scope', '$uibModal
 /**
  * Controller used in the modal window allowing an admin to close an accounting period
  */
-Application.Controllers.controller('ClosePeriodModalController', ['$scope', '$uibModalInstance', 'Invoice', 'AccountingPeriod', 'growl', '_t',
-  function ($scope, $uibModalInstance, Invoice, AccountingPeriod, growl, _t) {
+Application.Controllers.controller('ClosePeriodModalController', ['$scope', '$uibModalInstance', 'Invoice', 'AccountingPeriod', 'dialogs', 'growl', '_t',
+  function ($scope, $uibModalInstance, Invoice, AccountingPeriod, dialogs, growl, _t) {
     /* PUBLIC SCOPE */
     $scope.period = {
-      start_date: null,
-      end_date: null
+      start_at: null,
+      end_at: null
     };
 
     // AngularUI-Bootstrap datepickers parameters to define the period to close
@@ -643,11 +646,35 @@ Application.Controllers.controller('ClosePeriodModalController', ['$scope', '$ui
     };
 
     /**
-     * Validate the refunding and generate a refund invoice
+     * Validate the close period creation
      */
     $scope.ok = function () {
-      $uibModalInstance.close({ period: $scope.period });
-      growl.info(_t('not_implemented_yet'));
+      dialogs.confirm(
+        {
+          resolve: {
+            object () {
+              return {
+                title: _t('invoices.confirmation_required'),
+                msg: _t('invoices.confirm_close')
+              };
+            }
+          }
+        },
+        function () { // creation confirmed
+          AccountingPeriod.save({ accounting_period: $scope.period }, function (resp) {
+            growl.success(_t(
+              'invoices.period_START_END_closed_success',
+              { START: moment(resp.start_at).format('LL'), END: moment(resp.end_at).format('LL') }
+            ));
+            $uibModalInstance.close(resp);
+          }
+          , function(error) {
+            growl.error(_t('invoices.failed_to_close_period'));
+            console.error(error);
+          });
+        }
+      );
+
     };
 
     /**
diff --git a/app/assets/javascripts/services/accounting_period.js b/app/assets/javascripts/services/accounting_period.js
index b5a92433b..9ffb9e03a 100644
--- a/app/assets/javascripts/services/accounting_period.js
+++ b/app/assets/javascripts/services/accounting_period.js
@@ -1,11 +1,11 @@
 'use strict';
 
 Application.Services.factory('AccountingPeriod', ['$resource', function ($resource) {
-  return $resource('/api/accounting_period/:id',
+  return $resource('/api/accounting_periods/:id',
     { id: '@id' }, {
       lastClosingEnd: {
         method: 'GET',
-        url: '/api/accounting_period/last_closing_end'
+        url: '/api/accounting_periods/last_closing_end'
       }
     }
   );
diff --git a/app/assets/templates/admin/invoices/closePeriodModal.html.erb b/app/assets/templates/admin/invoices/closePeriodModal.html.erb
index 186a6dbca..7a48adbbc 100644
--- a/app/assets/templates/admin/invoices/closePeriodModal.html.erb
+++ b/app/assets/templates/admin/invoices/closePeriodModal.html.erb
@@ -3,14 +3,14 @@
 </div>
 <div class="modal-body">
   <form name="closePeriodForm" novalidate="novalidate" class="row">
-    <div class="form-group col-md-6" ng-class="{'has-error': closePeriodForm.start_date.$dirty && closePeriodForm.start_date.$invalid }">
+    <div class="form-group col-md-6" ng-class="{'has-error': closePeriodForm.start_at.$dirty && closePeriodForm.start_at.$invalid }">
       <label translate>{{ 'invoices.close_from_date' }}</label>
       <div class="input-group">
         <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
         <input type="text"
                class="form-control"
-               name="start_date"
-               ng-model="period.start_date"
+               name="start_at"
+               ng-model="period.start_at"
                uib-datepicker-popup="{{datePicker.format}}"
                datepicker-options="datePicker.options"
                is-open="datePicker.startOpened"
@@ -18,16 +18,16 @@
                ng-click="openDatePicker($event, 'start')"
                required/>
       </div>
-      <span class="help-block" ng-show="closePeriodForm.start_date.$dirty && closePeriodForm.start_date.$error.required" translate>{{ 'invoices.start_date_is_required' }}</span>
+      <span class="help-block" ng-show="closePeriodForm.start_at.$dirty && closePeriodForm.start_at.$error.required" translate>{{ 'invoices.start_date_is_required' }}</span>
     </div>
-    <div class="form-group col-md-6" ng-class="{'has-error': closePeriodForm.end_date.$dirty && closePeriodForm.end_date.$invalid }">
+    <div class="form-group col-md-6" ng-class="{'has-error': closePeriodForm.end_at.$dirty && closePeriodForm.end_at.$invalid }">
       <label translate>{{ 'invoices.close_until_date' }}</label>
       <div class="input-group">
         <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
         <input type="text"
                class="form-control"
-               name="end_date"
-               ng-model="period.end_date"
+               name="end_at"
+               ng-model="period.end_at"
                uib-datepicker-popup="{{datePicker.format}}"
                datepicker-options="datePicker.options"
                is-open="datePicker.endOpened"
@@ -35,7 +35,7 @@
                ng-click="openDatePicker($event, 'end')"
                required/>
       </div>
-      <span class="help-block" ng-show="closePeriodForm.end_date.$dirty && closePeriodForm.end_date.$error.required" translate>{{ 'invoices.end_date_is_required' }}</span>
+      <span class="help-block" ng-show="closePeriodForm.end_at.$dirty && closePeriodForm.end_at.$error.required" translate>{{ 'invoices.end_date_is_required' }}</span>
     </div>
   </form>
   <div>
diff --git a/app/controllers/api/accounting_periods_controller.rb b/app/controllers/api/accounting_periods_controller.rb
index 2635047d5..0d85fcae3 100644
--- a/app/controllers/api/accounting_periods_controller.rb
+++ b/app/controllers/api/accounting_periods_controller.rb
@@ -1,7 +1,10 @@
+# frozen_string_literal: true
+
+# API Controller for resources of AccountingPeriod
 class API::AccountingPeriodsController < API::ApiController
 
-  before_action :authenticate_user!, except: %i[index show]
-  before_action :set_period, only: %i[show update destroy]
+  before_action :authenticate_user!
+  before_action :set_period, only: %i[show]
 
   def index
     @accounting_periods = AccountingPeriod.all
@@ -11,7 +14,7 @@ class API::AccountingPeriodsController < API::ApiController
 
   def create
     authorize AccountingPeriod
-    @accounting_period = AccountingPeriod.new(tag_params)
+    @accounting_period = AccountingPeriod.new(period_params)
     if @accounting_period.save
       render :show, status: :created, location: @accounting_period
     else
@@ -19,6 +22,11 @@ class API::AccountingPeriodsController < API::ApiController
     end
   end
 
+  def last_closing_end
+    authorize AccountingPeriod
+    @last_period = AccountingPeriodService.find_last_period
+  end
+
   private
 
   def set_period
@@ -26,6 +34,6 @@ class API::AccountingPeriodsController < API::ApiController
   end
 
   def period_params
-    params.require(:accounting_period).permit(:start_date, :end_date)
+    params.require(:accounting_period).permit(:start_at, :end_at)
   end
 end
diff --git a/app/policies/accounting_period_policy.rb b/app/policies/accounting_period_policy.rb
new file mode 100644
index 000000000..07444e8c1
--- /dev/null
+++ b/app/policies/accounting_period_policy.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# Check the access policies for API::AccountingPeriodsController
+class AccountingPeriodPolicy < ApplicationPolicy
+  %w[index show create last_closing_end].each do |action|
+    define_method "#{action}?" do
+      user.is_admin?
+    end
+  end
+end
diff --git a/app/services/accounting_period_service.rb b/app/services/accounting_period_service.rb
new file mode 100644
index 000000000..951e953d5
--- /dev/null
+++ b/app/services/accounting_period_service.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+# Provides methods for accessing AccountingPeriods properties
+class AccountingPeriodService
+
+  def find_last_period
+    AccountingPeriod.where(end_at: AccountingPeriod.select('max(end_at)')).first
+  end
+end
diff --git a/app/views/api/accounting_periods/last_closing_end.json.jbuilder b/app/views/api/accounting_periods/last_closing_end.json.jbuilder
new file mode 100644
index 000000000..59130a833
--- /dev/null
+++ b/app/views/api/accounting_periods/last_closing_end.json.jbuilder
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+json.extract! @last_period, :id, :end_at
diff --git a/app/views/api/accounting_periods/show.json.jbuilder b/app/views/api/accounting_periods/show.json.jbuilder
new file mode 100644
index 000000000..a66aad1ab
--- /dev/null
+++ b/app/views/api/accounting_periods/show.json.jbuilder
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+json.extract! @accounting_period, :id, :start_at, :end_at, :closed_at, :closed_by, :created_at
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index aba5349b7..55d49f2fb 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -412,6 +412,7 @@ en:
           end_date: "To"
           closed_at: "Closed at"
           closed_by: "By"
+          confirmation_required: "Confirmation required"
 
       members:
         # management of users, labels, groups, and so on
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index ddd2669ad..265af453c 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -412,6 +412,10 @@ fr:
           end_date: "Au"
           closed_at: "Clôturé le"
           closed_by: "Par"
+          confirmation_required: "Confirmation requise"
+          confirm_close: "Êtes-vous sur de vouloir clôturer cette période comptable ? Toute modification ultérieure sera impossible."
+          period_START_END_closed_success: "La période comptable du {{START}} au {{END}} a bien été clôturée"
+          failed_to_close_period: "Une erreur est survenue, impossible de clôturer la période comptable"
 
       members:
         # gestion des utilisateurs, des groupes, des étiquettes, etc.
diff --git a/config/routes.rb b/config/routes.rb
index 9816030d7..cea4b7f3c 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -127,6 +127,9 @@ Rails.application.routes.draw do
     end
     resources :price_categories
     resources :spaces
+    resources :accounting_periods do
+      get 'last_closing_end'
+    end
 
     # i18n
     # regex allows using dots in URL for 'state'