diff --git a/src/Iyzipay/Model/BasketItem.php b/src/Iyzipay/Model/BasketItem.php
index e1990cac..44f29f35 100644
--- a/src/Iyzipay/Model/BasketItem.php
+++ b/src/Iyzipay/Model/BasketItem.php
@@ -16,6 +16,7 @@ class BasketItem extends BaseModel
     private $itemType;
     private $subMerchantKey;
     private $subMerchantPrice;
+    private $withholdingTax;
 
     public function getId()
     {
@@ -97,6 +98,16 @@ public function setSubMerchantPrice($subMerchantPrice)
         $this->subMerchantPrice = $subMerchantPrice;
     }
 
+    public function getWithholdingTax()
+    {
+        return $this->withholdingTax;
+    }
+
+    public function setWithholdingTax($withholdingTax)
+    {
+        $this->withholdingTax = $withholdingTax;
+    }
+
     public function getJsonObject()
     {
         return JsonBuilder::create()
@@ -108,6 +119,7 @@ public function getJsonObject()
             ->add("itemType", $this->getItemType())
             ->add("subMerchantKey", $this->getSubMerchantKey())
             ->addPrice("subMerchantPrice", $this->getSubMerchantPrice())
+            ->add("withholdingTax", $this->getWithholdingTax())
             ->getObject();
     }
 
diff --git a/src/Iyzipay/Model/Mapper/PaymentItemMapper.php b/src/Iyzipay/Model/Mapper/PaymentItemMapper.php
index 0a2a13bb..6bbfe8fd 100644
--- a/src/Iyzipay/Model/Mapper/PaymentItemMapper.php
+++ b/src/Iyzipay/Model/Mapper/PaymentItemMapper.php
@@ -76,6 +76,9 @@ public function mapPaymentItems($itemTransactions)
             if (isset($itemTransaction->convertedPayout)) {
                 $paymentItem->setConvertedPayout($this->mapConvertedPayout($itemTransaction->convertedPayout));
             }
+            if (isset($itemTransaction->withholdingTax)) {
+                $paymentItem->setWithholdingTax($itemTransaction->withholdingTax);
+            }
             $paymentItems[$index] = $paymentItem;
         }
         return $paymentItems;
diff --git a/src/Iyzipay/Model/Mapper/SubMerchantPaymentItemResourceMapper.php b/src/Iyzipay/Model/Mapper/SubMerchantPaymentItemResourceMapper.php
index 44ff70f5..b40b2a38 100644
--- a/src/Iyzipay/Model/Mapper/SubMerchantPaymentItemResourceMapper.php
+++ b/src/Iyzipay/Model/Mapper/SubMerchantPaymentItemResourceMapper.php
@@ -27,6 +27,11 @@ public function mapSubMerchantPaymentItemResourceFrom(SubMerchantPaymentItemUpda
             $create->setSubMerchantPrice($jsonObject->subMerchantPrice);
         }
 
+        if(isset($jsonObject->withholdingTax))
+        {
+            $create->setWithholdingTax($jsonObject->withholdingTax);
+        }
+
         return $create;
     }
 
diff --git a/src/Iyzipay/Model/PaymentItem.php b/src/Iyzipay/Model/PaymentItem.php
index d1e752ca..09e7ad3d 100644
--- a/src/Iyzipay/Model/PaymentItem.php
+++ b/src/Iyzipay/Model/PaymentItem.php
@@ -23,6 +23,7 @@ class PaymentItem
     private $subMerchantPayoutAmount;
     private $merchantPayoutAmount;
     private $convertedPayout;
+    private $withholdingTax;
 
     public function getItemId()
     {
@@ -213,4 +214,14 @@ public function setConvertedPayout($convertedPayout)
     {
         $this->convertedPayout = $convertedPayout;
     }
+
+    public function getWithholdingTax()
+    {
+        return $this->withholdingTax;
+    }
+
+    public function setWithholdingTax($withholdingTax)
+    {
+        $this->withholdingTax = $withholdingTax;
+    }
 }
\ No newline at end of file
diff --git a/src/Iyzipay/Model/SubMerchantPaymentItemResource.php b/src/Iyzipay/Model/SubMerchantPaymentItemResource.php
index 8478c445..f3b2fb94 100644
--- a/src/Iyzipay/Model/SubMerchantPaymentItemResource.php
+++ b/src/Iyzipay/Model/SubMerchantPaymentItemResource.php
@@ -9,6 +9,7 @@ class SubMerchantPaymentItemResource extends IyzipayResource
     private $subMerchantKey;
     private $paymentTransactionId;
     private $subMerchantPrice;
+    private $withholdingTax;
 
 
     public function getSubMerchantKey()
@@ -40,4 +41,14 @@ public function setSubMerchantPrice($subMerchantPrice)
     {
         $this->subMerchantPrice = $subMerchantPrice;
     }
+
+    public function getWithholdingTax()
+    {
+        return $this->withholdingTax;
+    }
+
+    public function setWithholdingTax($withholdingTax)
+    {
+        $this->withholdingTax = $withholdingTax;
+    }
 }
\ No newline at end of file
diff --git a/src/Iyzipay/Request/SubMerchantPaymentItemUpdateRequest.php b/src/Iyzipay/Request/SubMerchantPaymentItemUpdateRequest.php
index 3f1e6b55..ba8c2e18 100644
--- a/src/Iyzipay/Request/SubMerchantPaymentItemUpdateRequest.php
+++ b/src/Iyzipay/Request/SubMerchantPaymentItemUpdateRequest.php
@@ -11,6 +11,7 @@ class SubMerchantPaymentItemUpdateRequest extends Request
     private $subMerchantKey;
     private $paymentTransactionId;
     private $subMerchantPrice;
+    private $withholdingTax;
 
 
     public function getSubMerchantKey()
@@ -43,6 +44,16 @@ public function setSubMerchantPrice($subMerchantPrice)
         $this->subMerchantPrice = $subMerchantPrice;
     }
 
+    public function getWithholdingTax()
+    {
+        return $this->withholdingTax;
+    }
+
+    public function setWithholdingTax($withholdingTax)
+    {
+        $this->withholdingTax = $withholdingTax;
+    }
+
 
     public function getJsonObject()
     {
@@ -51,6 +62,7 @@ public function getJsonObject()
             ->add("subMerchantKey", $this->getSubMerchantKey())
             ->add("paymentTransactionId", $this->getPaymentTransactionId())
             ->addPrice("subMerchantPrice", $this->getSubMerchantPrice())
+            ->addPrice("withholdingTax", $this->getWithholdingTax())
             ->getObject();
     }