diff --git a/Library/ProrationSettings.cs b/Library/ProrationSettings.cs
new file mode 100644
index 00000000..1a841c57
--- /dev/null
+++ b/Library/ProrationSettings.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+
+namespace Recurly
+{
+    public class ProrationSettings
+    {
+        public enum Options
+        {
+            ProratedAmount,
+            FullAmount,
+            None
+        }
+
+        /// <summary>
+        /// Proration behavior to be applied to charges for the subscription change.
+        /// Can be set to FullAmount, ProratedAmount, or None.
+        /// When not set, default proration settings will be applied.
+        /// </summary>
+        public Options? Charge { get; set; }
+
+        /// <summary>
+        /// Proration behavior to be applied to credits for the subscription change.
+        /// Can be set to FullAmount, ProratedAmount, or None.
+        /// When not set, default proration settings will be applied.
+        /// </summary>
+        public Options? Credit { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Library/SubscriptionChange.cs b/Library/SubscriptionChange.cs
index c6c19a93..af04aaf3 100644
--- a/Library/SubscriptionChange.cs
+++ b/Library/SubscriptionChange.cs
@@ -24,6 +24,12 @@ public enum ChangeTimeframe : short
 
         public string PlanCode { get; set; }
 
+        /// <summary>
+        /// Proration settings to be applied to the subscription change.
+        /// If not set, the default proration behavior will apply.
+        /// </summary>
+        public ProrationSettings ProrationSettings { get; set; }
+
         /// <summary>
         /// List of custom fields
         /// </summary>
@@ -127,6 +133,20 @@ internal void WriteChangeSubscriptionXml(XmlTextWriter xmlWriter)
 
             xmlWriter.WriteStringIfValid("plan_code", PlanCode);
 
+            if (ProrationSettings != null)
+            {
+                xmlWriter.WriteStartElement("proration_settings");
+
+                if (ProrationSettings.Charge != null)
+                    xmlWriter.WriteElementString("charge", ProrationSettings.Charge.Value.ToString().EnumNameToTransportCase());
+
+                if (ProrationSettings.Credit != null)
+                    xmlWriter.WriteElementString("credit", ProrationSettings.Credit.Value.ToString().EnumNameToTransportCase());
+
+                xmlWriter.WriteEndElement();
+            }
+
+
             if (AddOns != null)
                 xmlWriter.WriteIfCollectionHasAny("subscription_add_ons", AddOns);
 
diff --git a/Test/SubscriptionTest.cs b/Test/SubscriptionTest.cs
index 4b3b902e..a8ad8cf9 100644
--- a/Test/SubscriptionTest.cs
+++ b/Test/SubscriptionTest.cs
@@ -305,6 +305,51 @@ public void UpdateSubscription()
             Assert.Equal(newSubscription.NetTermsType, NetTermsType.NET);
         }
 
+        [RecurlyFact(TestEnvironment.Type.Integration)]
+        public void UpdateSubscriptionWithProrationSettings()
+        {
+            var plan = new Plan(GetMockPlanCode(), GetMockPlanName())
+            {
+                Description = "Update Subscription Plan 1"
+            };
+            plan.UnitAmountInCents.Add("USD", 1500);
+            plan.Create();
+            PlansToDeactivateOnDispose.Add(plan);
+
+            var plan2 = new Plan(GetMockPlanCode(), GetMockPlanName())
+            {
+                Description = "Update Subscription Plan 2"
+            };
+            plan2.UnitAmountInCents.Add("USD", 750);
+            plan2.Create();
+            PlansToDeactivateOnDispose.Add(plan2);
+
+            var account = CreateNewAccountWithBillingInfo();
+
+            var sub = new Subscription(account, plan, "USD");
+            sub.Create();
+
+            var subChange = new SubscriptionChange()
+            {
+                PlanCode = plan2.PlanCode,
+                BillingInfoUuid = account.GetBillingInfos()[0].Id,
+                NetTerms = 10,
+                NetTermsType = NetTermsType.NET,
+                ProrationSettings = new ProrationSettings()
+                {
+                    Charge = ProrationSettings.Options.FullAmount,
+                    Credit = ProrationSettings.Options.None
+                }
+            };
+
+            Assert.Equal(subChange.ProrationSettings.Charge, ProrationSettings.Options.FullAmount);
+            Assert.Equal(subChange.ProrationSettings.Credit, ProrationSettings.Options.None);
+
+            Subscription.ChangeSubscription(sub.Uuid, subChange);
+
+            var newSubscription = Subscriptions.Get(sub.Uuid);
+        }
+
         [RecurlyFact(TestEnvironment.Type.Integration)]
         public void CancelSubscription()
         {