diff --git a/includes/Admin/Admin.php b/includes/Admin/Admin.php
index 2718eb1..4cdc486 100644
--- a/includes/Admin/Admin.php
+++ b/includes/Admin/Admin.php
@@ -1373,6 +1373,16 @@ class Admin {
 									<p class='kgvvm-help'><?php echo esc_html__( 'Betrag je ausgewählter Einheit, also pro Parzelle oder pro Mitglied.', KGVVM_TEXT_DOMAIN ); ?></p>
 								</td>
 							</tr>
+							<tr>
+								<th scope='row'><?php echo esc_html__( 'Position', KGVVM_TEXT_DOMAIN ); ?></th>
+								<td>
+									<label>
+										<input type='checkbox' name='is_mandatory' value='1' <?php checked( $cost ? (bool) $cost->is_mandatory : true, true ); ?> />
+										<?php echo esc_html__( 'Verpflichtende Position', KGVVM_TEXT_DOMAIN ); ?>
+									</label>
+									<p class='kgvvm-help'><?php echo esc_html__( 'Wenn aktiviert: Diese Position wird automatisch in allen Abrechnungen berechnet. Wenn deaktiviert: Diese Position wird als manuelle/optionale Position behandelt.', KGVVM_TEXT_DOMAIN ); ?></p>
+								</td>
+							</tr>
 							<tr>
 								<th scope='row'><label for='kgvvm-cost-note'><?php echo esc_html__( 'Bemerkung', KGVVM_TEXT_DOMAIN ); ?></label></th>
 								<td><textarea name='note' id='kgvvm-cost-note' rows='4' class='large-text'><?php echo esc_textarea( $cost ? $cost->note : '' ); ?></textarea></td>
diff --git a/includes/Repositories/CostRepository.php b/includes/Repositories/CostRepository.php
index 3c65246..a6fde31 100644
--- a/includes/Repositories/CostRepository.php
+++ b/includes/Repositories/CostRepository.php
@@ -93,11 +93,12 @@ class CostRepository extends AbstractRepository {
 			'distribution_type' => isset( $data['distribution_type'] ) ? $data['distribution_type'] : 'parcel',
 			'unit_amount'       => isset( $data['unit_amount'] ) ? (float) $data['unit_amount'] : 0,
 			'total_cost'        => (float) $data['total_cost'],
+			'is_mandatory'      => isset( $data['is_mandatory'] ) ? (int) (bool) $data['is_mandatory'] : 1,
 			'note'              => $data['note'],
 			'updated_at'        => $this->now(),
 		);
 
-		$formats = array( '%d', '%s', '%s', '%f', '%f', '%s', '%s' );
+		$formats = array( '%d', '%s', '%s', '%f', '%f', '%d', '%s', '%s' );
 
 		$this->ensure_year( $payload['entry_year'] );
 
@@ -107,7 +108,7 @@ class CostRepository extends AbstractRepository {
 		}
 
 		$payload['created_at'] = $this->now();
-		$this->wpdb->insert( $this->table, $payload, array( '%d', '%s', '%s', '%f', '%f', '%s', '%s', '%s' ) );
+		$this->wpdb->insert( $this->table, $payload, array( '%d', '%s', '%s', '%f', '%f', '%d', '%s', '%s', '%s' ) );
 
 		return $this->wpdb->insert_id;
 	}
diff --git a/includes/Schema.php b/includes/Schema.php
index 3925d2b..1d46e67 100644
--- a/includes/Schema.php
+++ b/includes/Schema.php
@@ -201,6 +201,7 @@ class Schema {
 			distribution_type VARCHAR(20) NOT NULL DEFAULT 'parcel',
 			unit_amount DECIMAL(12,2) NULL,
 			total_cost DECIMAL(12,2) NOT NULL DEFAULT 0.00,
+			is_mandatory TINYINT(1) NOT NULL DEFAULT 1,
 			note TEXT NULL,
 			created_at DATETIME NOT NULL,
 			updated_at DATETIME NOT NULL,
diff --git a/includes/Validator.php b/includes/Validator.php
index d4c9688..f0c1d02 100644
--- a/includes/Validator.php
+++ b/includes/Validator.php
@@ -259,6 +259,7 @@ class Validator {
 		$unit_amount       = isset( $data['unit_amount'] ) ? str_replace( ',', '.', wp_unslash( $data['unit_amount'] ) ) : '';
 		$entry_year        = $this->sanitize_cost_year( $data );
 		$distribution_type = sanitize_key( wp_unslash( isset( $data['distribution_type'] ) ? $data['distribution_type'] : 'parcel' ) );
+		$is_mandatory       = isset( $data['is_mandatory'] ) ? (bool) $data['is_mandatory'] : true;
 
 		return array(
 			'entry_year'        => $entry_year,
@@ -266,6 +267,7 @@ class Validator {
 			'distribution_type' => $distribution_type,
 			'unit_amount'       => '' === trim( (string) $unit_amount ) ? '' : (float) $unit_amount,
 			'total_cost'        => 0.0,
+			'is_mandatory'      => $is_mandatory,
 			'note'              => sanitize_textarea_field( wp_unslash( isset( $data['note'] ) ? $data['note'] : '' ) ),
 		);
 	}