diff --git a/includes/abstracts/abstract-wc-order.php b/includes/abstracts/abstract-wc-order.php
index 544b6c9beee..a6e67ce4d4b 100644
--- a/includes/abstracts/abstract-wc-order.php
+++ b/includes/abstracts/abstract-wc-order.php
@@ -1453,6 +1453,30 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 		$this->update_taxes();
 	}
 
+	/**
+	 * Calculate fees for all line items.
+	 */
+	public function calculate_fees() {
+		// Sum fee costs.
+		$fees_total = 0;
+
+		foreach ( $this->get_fees() as $item ) {
+			$fee_total = $item->get_total();
+
+			if ( 0 > $fee_total ) {
+				$max_discount = round( $cart_total + $fees_total + $shipping_total, wc_get_price_decimals() ) * -1;
+
+				if ( $fee_total < $max_discount && 0 > $max_discount ) {
+					$item->set_total( $max_discount );
+				}
+			}
+
+			$fees_total += $item->get_total();
+		}
+
+		return $fees_total;
+	}
+
 	/**
 	 * Update tax lines for the order based on the line item taxes themselves.
 	 */
@@ -1554,7 +1578,6 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	public function calculate_totals( $and_taxes = true ) {
 		do_action( 'woocommerce_order_before_calculate_totals', $and_taxes, $this );
 
-		$fees_total        = 0;
 		$shipping_total    = 0;
 		$cart_subtotal_tax = 0;
 		$cart_total_tax    = 0;
@@ -1570,19 +1593,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 		$this->set_shipping_total( $shipping_total );
 
 		// Sum fee costs.
-		foreach ( $this->get_fees() as $item ) {
-			$fee_total = $item->get_total();
-
-			if ( 0 > $fee_total ) {
-				$max_discount = round( $cart_total + $fees_total + $shipping_total, wc_get_price_decimals() ) * -1;
-
-				if ( $fee_total < $max_discount && 0 > $max_discount ) {
-					$item->set_total( $max_discount );
-				}
-			}
-
-			$fees_total += $item->get_total();
-		}
+		$fees_total = $this->calculate_fees();
 
 		// Calculate taxes for items, shipping, discounts. Note; this also triggers save().
 		if ( $and_taxes ) {