diff --git a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/en.ftl b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/en.ftl
index 12657f864fb..6a7e0614efa 100644
--- a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/en.ftl
+++ b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/en.ftl
@@ -8,6 +8,7 @@ subscriptionRenewalReminder-content-greeting = Dear { $productName } customer,
 # Variables
 #   $reminderLength (String) - The number of days until the current subscription is set to automatically renew, e.g. 14
 subscriptionRenewalReminder-content-intro = Your current subscription is set to automatically renew in { $reminderLength } days.
+subscriptionRenewalReminder-content-discount-change = Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied.
 subscriptionRenewalReminder-content-discount-ending = Because a previous discount has ended, your subscription will renew at the standard price.
 # Variables
 #   $invoiceTotal (String) - The amount of the subscription invoice, including currency, e.g. $10.00
diff --git a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.mjml b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.mjml
index 9238e2016f1..1795eb612b7 100644
--- a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.mjml
+++ b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.mjml
@@ -19,11 +19,19 @@
     </mj-text>
 
     <% if (locals.hadDiscount) { %>
+      <% if (locals.hasRenewalDiscount) { %>
+    <mj-text css-class="text-body">
+      <span data-l10n-id="subscriptionRenewalReminder-content-discount-change">
+        Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied.
+      </span>
+    </mj-text>
+      <% } else { %>
     <mj-text css-class="text-body">
       <span data-l10n-id="subscriptionRenewalReminder-content-discount-ending">
         Because a previous discount has ended, your subscription will renew at the standard price.
       </span>
     </mj-text>
+      <% } %>
     <% } %>
 
     <mj-text css-class="text-body">
diff --git a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.stories.ts b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.stories.ts
index 4ecb3b0065a..e729f88d017 100644
--- a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.stories.ts
+++ b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.stories.ts
@@ -19,6 +19,7 @@ const data = {
   subscriptionSupportUrl: 'http://localhost:3030/support',
   updateBillingUrl: 'http://localhost:3030/subscriptions',
   hadDiscount: false,
+  hasRenewalDiscount: false,
 };
 
 const createStory = subplatStoryWithProps<TemplateData>(
@@ -58,6 +59,28 @@ export const YearlyPlanDiscountEnding = createStory(
     reminderLength: '15',
     invoiceTotal: '$199.99',
     hadDiscount: true,
+    hasRenewalDiscount: false,
   },
   'Yearly Plan - Discount Ending'
 );
+
+export const MonthlyPlanDiscountChanging = createStory(
+  {
+    hadDiscount: true,
+    hasRenewalDiscount: true,
+    invoiceTotal: '$14.00',
+  },
+  'Monthly Plan - Discount Changing'
+);
+
+export const YearlyPlanDiscountChanging = createStory(
+  {
+    planInterval: 'year',
+    planIntervalCount: '1',
+    reminderLength: '15',
+    invoiceTotal: '$139.99',
+    hadDiscount: true,
+    hasRenewalDiscount: true,
+  },
+  'Yearly Plan - Discount Changing'
+);
diff --git a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.ts b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.ts
index 6a6d1c68f63..3ed3bd16b24 100644
--- a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.ts
+++ b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.ts
@@ -15,10 +15,11 @@ export type TemplateData = SubscriptionSupportContactTemplateData &
     subscriptionSupportUrl: string;
     updateBillingUrl: string;
     hadDiscount?: boolean;
+    hasRenewalDiscount?: boolean;
   };
 
 export const template = 'subscriptionRenewalReminder';
-export const version = 3;
+export const version = 4;
 export const layout = 'subscription';
 export const includes = {
   subject: {
diff --git a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.txt b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.txt
index 3705d2e5502..228774f66c2 100644
--- a/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.txt
+++ b/libs/accounts/email-renderer/src/templates/subscriptionRenewalReminder/index.txt
@@ -7,12 +7,14 @@ subscriptionRenewalReminder-content-greeting = "Dear <%- productName %> customer
 subscriptionRenewalReminder-content-intro = "Your current subscription is set to automatically renew in <%- reminderLength %> days."
 
 <% if (locals.hadDiscount) { %>
+  <% if (locals.hasRenewalDiscount) { %>
+subscriptionRenewalReminder-content-discount-change = "Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied."
+  <% } else { %>
 subscriptionRenewalReminder-content-discount-ending = "Because a previous discount has ended, your subscription will renew at the standard price."
+  <% } %>
+<% } %>
 
 subscriptionRenewalReminder-content-charge = "At that time, Mozilla will renew your <%- planIntervalCount %> <%- planInterval %> subscription and a charge of <%- invoiceTotal %> will be applied to the payment method on your account."
-<% } else { %>
-subscriptionRenewalReminder-content-charge = "At that time, Mozilla will renew your <%- planIntervalCount %> <%- planInterval %> subscription and a charge of <%- invoiceTotal %> will be applied to the payment method on your account."
-<% } %>
 
 <%- include ('/partials/subscriptionUpdateBillingEnsure/index.txt') %>
 
diff --git a/libs/payments/ui/src/lib/nestapp/validators/GetInterstitialOfferContentActionResult.ts b/libs/payments/ui/src/lib/nestapp/validators/GetInterstitialOfferContentActionResult.ts
index 120b6bc1a72..1e79da43bb4 100644
--- a/libs/payments/ui/src/lib/nestapp/validators/GetInterstitialOfferContentActionResult.ts
+++ b/libs/payments/ui/src/lib/nestapp/validators/GetInterstitialOfferContentActionResult.ts
@@ -45,7 +45,8 @@ export class GetInterstitialOfferContentActionResult {
   pageContent!: PageContent | null;
 
   @IsString()
-  reason!: string;
+  @IsOptional()
+  reason?: string | null;
 
   @IsOptional()
   @IsString()
diff --git a/packages/fxa-auth-server/lib/payments/subscription-reminders.ts b/packages/fxa-auth-server/lib/payments/subscription-reminders.ts
index d2e3a82b517..bc7e6f93ccd 100644
--- a/packages/fxa-auth-server/lib/payments/subscription-reminders.ts
+++ b/packages/fxa-auth-server/lib/payments/subscription-reminders.ts
@@ -268,7 +268,6 @@ export class SubscriptionReminders {
   /**
    * Determine if a discount is ending by checking that the subscription currently
    * has a discount but the upcoming invoice does not.
-   * TODO in PAY-3485: Handle the case where the discount changes without ending.
    */
   private hasDiscountEnding(
     subscription: Stripe.Subscription,
@@ -277,6 +276,15 @@ export class SubscriptionReminders {
     return !!subscription.discount && !invoicePreview.discount;
   }
 
+  /**
+   * Determine if the upcoming invoice has a discount.
+   */
+  private hasRenewalDiscount(
+    invoicePreview: Stripe.UpcomingInvoice
+  ): boolean {
+    return !!invoicePreview.discount;
+  }
+
   /**
    * Send out a renewal reminder email if we haven't already sent one.
    */
@@ -341,6 +349,8 @@ export class SubscriptionReminders {
 
       // Detect if discount is ending
       const hadDiscount = this.hasDiscountEnding(subscription, invoicePreview);
+      // Detect if renewal has a discount
+      const hasRenewalDiscount = this.hasRenewalDiscount(invoicePreview);
 
       await this.mailer.sendSubscriptionRenewalReminderEmail(
         account.emails,
@@ -359,6 +369,7 @@ export class SubscriptionReminders {
           productMetadata: formattedSubscription.productMetadata,
           planConfig: formattedSubscription.planConfig,
           hadDiscount,
+          hasRenewalDiscount,
         }
       );
       await this.updateSentEmail(
diff --git a/packages/fxa-auth-server/lib/senders/email.js b/packages/fxa-auth-server/lib/senders/email.js
index 61cd303f6be..ee6485740d3 100644
--- a/packages/fxa-auth-server/lib/senders/email.js
+++ b/packages/fxa-auth-server/lib/senders/email.js
@@ -3253,6 +3253,7 @@ module.exports = function (log, config, bounces, statsd) {
           message.acceptLanguage
         ),
         hadDiscount: message.hadDiscount || false,
+        hasRenewalDiscount: message.hasRenewalDiscount || false,
       },
     });
   };
diff --git a/packages/fxa-auth-server/lib/senders/emails/templates/_versions.json b/packages/fxa-auth-server/lib/senders/emails/templates/_versions.json
index d1555bf7a97..03a6be1e370 100644
--- a/packages/fxa-auth-server/lib/senders/emails/templates/_versions.json
+++ b/packages/fxa-auth-server/lib/senders/emails/templates/_versions.json
@@ -1,6 +1,6 @@
 {
   "subscriptionReactivation": 2,
-  "subscriptionRenewalReminder": 3,
+  "subscriptionRenewalReminder": 4,
   "subscriptionEndingReminder": 1,
   "subscriptionUpgrade": 7,
   "subscriptionDowngrade": 2,
diff --git a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/en.ftl b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/en.ftl
index 12657f864fb..6a7e0614efa 100644
--- a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/en.ftl
+++ b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/en.ftl
@@ -8,6 +8,7 @@ subscriptionRenewalReminder-content-greeting = Dear { $productName } customer,
 # Variables
 #   $reminderLength (String) - The number of days until the current subscription is set to automatically renew, e.g. 14
 subscriptionRenewalReminder-content-intro = Your current subscription is set to automatically renew in { $reminderLength } days.
+subscriptionRenewalReminder-content-discount-change = Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied.
 subscriptionRenewalReminder-content-discount-ending = Because a previous discount has ended, your subscription will renew at the standard price.
 # Variables
 #   $invoiceTotal (String) - The amount of the subscription invoice, including currency, e.g. $10.00
diff --git a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.mjml b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.mjml
index b3eda94dbf8..af2c1e1a601 100644
--- a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.mjml
+++ b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.mjml
@@ -19,11 +19,19 @@
     </mj-text>
 
     <% if (hadDiscount) { %>
+      <% if (hasRenewalDiscount) { %>
+    <mj-text css-class="text-body">
+      <span data-l10n-id="subscriptionRenewalReminder-content-discount-change">
+        Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied.
+      </span>
+    </mj-text>
+      <% } else { %>
     <mj-text css-class="text-body">
       <span data-l10n-id="subscriptionRenewalReminder-content-discount-ending">
         Because a previous discount has ended, your subscription will renew at the standard price.
       </span>
     </mj-text>
+      <% } %>
     <% } %>
 
     <mj-text css-class="text-body">
diff --git a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.stories.ts b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.stories.ts
index 1d439259787..b6c380fde4e 100644
--- a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.stories.ts
+++ b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.stories.ts
@@ -21,6 +21,7 @@ const createStory = subplatStoryWithProps(
     subscriptionSupportUrl: 'http://localhost:3030/support',
     updateBillingUrl: 'http://localhost:3030/subscriptions',
     hadDiscount: false,
+    hasRenewalDiscount: false,
   }
 );
 
@@ -54,6 +55,28 @@ export const YearlyPlanDiscountEnding = createStory(
     reminderLength: '15',
     invoiceTotal: '$199.99',
     hadDiscount: true,
+    hasRenewalDiscount: false,
   },
   'Yearly Plan - Discount Ending'
 );
+
+export const MonthlyPlanDiscountChanging = createStory(
+  {
+    hadDiscount: true,
+    hasRenewalDiscount: true,
+    invoiceTotal: '$14.00',
+  },
+  'Monthly Plan - Discount Changing'
+);
+
+export const YearlyPlanDiscountChanging = createStory(
+  {
+    planInterval: 'year',
+    planIntervalCount: '1',
+    reminderLength: '15',
+    invoiceTotal: '$139.99',
+    hadDiscount: true,
+    hasRenewalDiscount: true,
+  },
+  'Yearly Plan - Discount Changing'
+);
diff --git a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.txt b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.txt
index b2ebcd9b19a..faa15f5a677 100644
--- a/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.txt
+++ b/packages/fxa-auth-server/lib/senders/emails/templates/subscriptionRenewalReminder/index.txt
@@ -7,12 +7,14 @@ subscriptionRenewalReminder-content-greeting = "Dear <%- productName %> customer
 subscriptionRenewalReminder-content-intro = "Your current subscription is set to automatically renew in <%- reminderLength %> days."
 
 <% if (hadDiscount) { %>
+  <% if (hasRenewalDiscount) { %>
+subscriptionRenewalReminder-content-discount-change = "Your next invoice reflects a change in pricing, as a previous discount has ended and a new discount has been applied."
+  <% } else { %>
 subscriptionRenewalReminder-content-discount-ending = "Because a previous discount has ended, your subscription will renew at the standard price."
+  <% } %>
+<% } %>
 
 subscriptionRenewalReminder-content-charge = "At that time, Mozilla will renew your <%- planIntervalCount %> <%- planInterval %> subscription and a charge of <%- invoiceTotal %> will be applied to the payment method on your account."
-<% } else { %>
-subscriptionRenewalReminder-content-charge = "At that time, Mozilla will renew your <%- planIntervalCount %> <%- planInterval %> subscription and a charge of <%- invoiceTotal %> will be applied to the payment method on your account."
-<% } %>
 
 <%- include ('/partials/subscriptionUpdateBillingEnsure/index.txt') %>