diff --git a/r2/r2/public/static/js/sponsored.js b/r2/r2/public/static/js/sponsored.js
index a7d870849..e8b58a278 100644
--- a/r2/r2/public/static/js/sponsored.js
+++ b/r2/r2/public/static/js/sponsored.js
@@ -397,7 +397,19 @@ r.sponsored = {
 
     check_bid: function($form) {
         var bid = this.get_bid($form),
-            minimum_bid = $("#bid").data("min_bid");
+            minimum_bid = $("#bid").data("min_bid"),
+            campaignName = $form.find('*[name=campaign_name]').val()
+
+        $('.budget-change-warning').hide()
+        if (campaignName != '') {
+            var $campaignRow = $('.' + campaignName),
+                campaignIsPaid = $campaignRow.data('paid'),
+                campaignBid = $campaignRow.data('bid')
+
+            if (campaignIsPaid && bid != campaignBid) {
+                $('.budget-change-warning').show()
+            }
+        }
 
         $(".minimum-spend").removeClass("error");
         if (bid < minimum_bid) {
diff --git a/r2/r2/templates/promotelinkform.html b/r2/r2/templates/promotelinkform.html
index 9105ecfe2..93dcdcb64 100644
--- a/r2/r2/templates/promotelinkform.html
+++ b/r2/r2/templates/promotelinkform.html
@@ -408,6 +408,9 @@ ${self.javascript_setup()}
               <div class="minimum-spend">
                 ${_('%(minimum)s minimum') % dict(minimum=format_currency(thing.min_bid, 'USD', locale=c.locale))}
               </div>
+              <div class="budget-change-warning error">
+                ${_('if you modify the budget of this paid campaign you will need to reauthorize payment by clicking the "pay" button')}
+              </div>
             </td>
           </tr>