diff --git a/src/app/Http/Controllers/API/V4/PaymentsController.php b/src/app/Http/Controllers/API/V4/PaymentsController.php
--- a/src/app/Http/Controllers/API/V4/PaymentsController.php
+++ b/src/app/Http/Controllers/API/V4/PaymentsController.php
@@ -360,9 +360,18 @@
         // Get the Mandate info
         $mandate = (array) $provider->getMandate($wallet);
 
-        $mandate['amount'] = (int) (PaymentProvider::MIN_AMOUNT / 100);
-        $mandate['balance'] = 0;
-        $mandate['isDisabled'] = !empty($mandate['id']) && $settings['mandate_disabled'];
+        // If this is a multi-month plan, we calculate the expected amount to be payed.
+        if (($plan = $wallet->plan()) && $plan->months >= 1) {
+            $mandate['amount'] = (int) (($plan->cost() * $plan->months) / 100);
+            $mandate['balance'] = 0;
+            $mandate['isDisabled'] = !empty($mandate['id']) && $settings['mandate_disabled'];
+            $mandate['isFixed'] = true;
+        } else {
+            $mandate['amount'] = (int) (PaymentProvider::MIN_AMOUNT / 100);
+            $mandate['balance'] = 0;
+            $mandate['isDisabled'] = !empty($mandate['id']) && $settings['mandate_disabled'];
+            $mandate['isFixed'] = false;
+        }
 
         foreach (['amount', 'balance'] as $key) {
             if (($value = $settings["mandate_{$key}"]) !== null) {
diff --git a/src/app/Plan.php b/src/app/Plan.php
--- a/src/app/Plan.php
+++ b/src/app/Plan.php
@@ -49,6 +49,8 @@
         'discount_qty',
         // the rate of the discount for this plan
         'discount_rate',
+        // minimum number of months this plan is for
+        'months',
         // number of free months (trial)
         'free_months',
     ];
@@ -59,6 +61,7 @@
         'promo_to' => 'datetime:Y-m-d H:i:s',
         'discount_qty' => 'integer',
         'discount_rate' => 'integer',
+        'months' => 'integer',
         'free_months' => 'integer'
     ];
 
diff --git a/src/database/migrations/2023_01_03_100000_plans_months.php b/src/database/migrations/2023_01_03_100000_plans_months.php
new file mode 100644
--- /dev/null
+++ b/src/database/migrations/2023_01_03_100000_plans_months.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table(
+            'plans',
+            function (Blueprint $table) {
+                $table->tinyInteger('months')->unsigned()->default(1);
+            }
+        );
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table(
+            'plans',
+            function (Blueprint $table) {
+                $table->dropColumn('months');
+            }
+        );
+    }
+};
diff --git a/src/resources/vue/Wallet.vue b/src/resources/vue/Wallet.vue
--- a/src/resources/vue/Wallet.vue
+++ b/src/resources/vue/Wallet.vue
@@ -25,6 +25,9 @@
                         <div v-if="mandate.isDisabled" class="disabled-mandate alert alert-danger">
                             {{ $t('wallet.auto-payment-disabled') }}
                         </div>
+                        <div v-if="mandate.isFixed" class="disabled-mandate alert alert-danger">
+                            This is a fixed mandate
+                        </div>
                         <template v-else>
                             <p v-html="$t('wallet.auto-payment-info', { amount: mandate.amount + ' ' + wallet.currency, balance: mandate.balance + ' ' + wallet.currency})"></p>
                             <p>{{ $t('wallet.payment-method', { method: mandate.method }) }}</p>