diff --git a/pom.xml b/pom.xml
index efe9d08f..2df80e4e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
     <groupId>com.mercadopago</groupId>
     <artifactId>dx-java</artifactId>
-    <version>1.0.36</version>
+    <version>1.1.0</version>
     <packaging>jar</packaging>
 
     <name>Mercadopago SDK</name>
diff --git a/src/main/java/com/mercadopago/core/MPBase.java b/src/main/java/com/mercadopago/core/MPBase.java
index 6eb9a5d9..9aa72d62 100644
--- a/src/main/java/com/mercadopago/core/MPBase.java
+++ b/src/main/java/com/mercadopago/core/MPBase.java
@@ -533,7 +533,7 @@ private static <T extends MPBase> String parsePath(String path, HashMap<String,
                 .append(accessToken);
 
         
-        if (!mapParams.isEmpty()) {
+        if (mapParams != null && !mapParams.isEmpty()) {
 	        for ( Map.Entry<String, String> entry : mapParams.entrySet()) {
 	            String key = entry.getKey();
 	            String value = entry.getValue();
diff --git a/src/main/java/com/mercadopago/resources/Preference.java b/src/main/java/com/mercadopago/resources/Preference.java
index 37cb7c63..60bb1e2e 100644
--- a/src/main/java/com/mercadopago/resources/Preference.java
+++ b/src/main/java/com/mercadopago/resources/Preference.java
@@ -21,8 +21,10 @@
  */
 public class Preference extends MPBase {
 
-    @NotNull private ArrayList<Item> items = null;
-    @NotNull private Payer payer = null;
+    @NotNull
+    private ArrayList<Item> items = null;
+    @NotNull
+    private Payer payer = null;
     private PaymentMethods paymentMethods = null;
     private Shipments shipments = null;
     private BackUrls backUrls = null;
@@ -60,6 +62,7 @@ public enum ProcessingMode {
     }
     private ArrayList<ProcessingMode> processingModes = null;
     private Boolean binaryMode = null;
+    private ArrayList<Tax> taxes = null;
 
     public ArrayList<Item> getItems() {
         return items;
@@ -266,6 +269,22 @@ public Preference setBinaryMode(Boolean binaryMode) {
         return this;
     }
 
+    public ArrayList<Tax> getTaxes() { return this.taxes; }
+
+    public Preference setTaxes(ArrayList<Tax> taxes) {
+        this.taxes = taxes;
+        return this;
+    }
+
+    public Preference appendTax(Tax tax) {
+        if (this.taxes == null) {
+            this.taxes = new ArrayList<>();
+        }
+        this.taxes.add(tax);
+        return this;
+    }
+
+
     public static Preference findById(String id) throws MPException {
         return findById(id, WITHOUT_CACHE);
     }
diff --git a/src/main/java/com/mercadopago/resources/datastructures/preference/Tax.java b/src/main/java/com/mercadopago/resources/datastructures/preference/Tax.java
new file mode 100644
index 00000000..07e905dd
--- /dev/null
+++ b/src/main/java/com/mercadopago/resources/datastructures/preference/Tax.java
@@ -0,0 +1,36 @@
+package com.mercadopago.resources.datastructures.preference;
+
+/**
+ * Mercado Pago MercadoPago
+ * Preference Tax class
+ *
+ * Created by Danilo Elias on 26/08/2019.
+ */
+public class Tax {
+
+    private TaxType type = null;
+    public enum TaxType {
+        IVA,
+        INC
+    }
+    private Float value = null;
+
+    public TaxType getType() {
+        return type;
+    }
+
+    public Float getValue() {
+        return value;
+    }
+
+    public Tax setType(TaxType type) {
+        this.type = type;
+        return this;
+    }
+
+    public Tax setValue(Float value) {
+        this.value = value;
+        return this;
+    }
+
+}
diff --git a/src/test/java/mercadopago/resources/PreferenceTest.java b/src/test/java/mercadopago/resources/PreferenceTest.java
index 27d8ed50..571948b1 100644
--- a/src/test/java/mercadopago/resources/PreferenceTest.java
+++ b/src/test/java/mercadopago/resources/PreferenceTest.java
@@ -13,7 +13,6 @@
 
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
 import java.util.Date;
 import java.util.UUID;
 
@@ -100,6 +99,10 @@ public void preferenceGettersSettersTest() throws MPException {
         DifferentialPricing differentialPricing = new DifferentialPricing();
         differentialPricing.setId(0);
 
+        Tax tax = new Tax();
+        tax.setType(Tax.TaxType.IVA);
+        tax.setValue(500f);
+
         Preference preference = new Preference();
         preference.appendItem(item);
         preference.setPayer(payer);
@@ -116,6 +119,7 @@ public void preferenceGettersSettersTest() throws MPException {
         preference.setMarketplace("Marketplace");
         preference.setMarketplaceFee(.01f);
         preference.setDifferentialPricing(differentialPricing);
+        preference.appendTax(tax);
 
         DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
 
@@ -186,6 +190,10 @@ public void preferenceGettersSettersTest() throws MPException {
         JsonObject jsonDifferentialPricing = (JsonObject) jsonPreference.get("differential_pricing");
         assertEquals(differentialPricing.getId().intValue(), jsonDifferentialPricing.get("id").getAsInt());
 
+        JsonObject jsonTax = (JsonObject) jsonPreference.get("taxes").getAsJsonArray().get(0);
+        assertEquals(tax.getType().toString(), jsonTax.get("type").getAsString());
+        assertEquals(tax.getValue(), jsonTax.get("value").getAsFloat(), 0.0f);
+
         assertEquals(preference.getNotificationUrl(), jsonPreference.get("notification_url").getAsString());
         assertNull(jsonPreference.get("id"));
         assertNull(jsonPreference.get("init_point"));