diff --git a/src/clj/auto_ap/handler.clj b/src/clj/auto_ap/handler.clj
index 55abf001..fd82a493 100644
--- a/src/clj/auto_ap/handler.clj
+++ b/src/clj/auto_ap/handler.clj
@@ -49,11 +49,18 @@
          :headers {"Content-Type" "application/edn"}})
   (POST "/pdf-upload"
         {{  files "file"} :params :as params}
-        (let [{:keys [filename tempfile]} files]
+        (let [{:keys [filename tempfile]} files
+              existing-invoices (invoices/get-all)]
+          (println existing-invoices)
           (invoices/insert-multi!
-           (for [{:keys [total date invoice-number customer-identifier] :as row}
+           (for [{:keys [total date invoice-number customer-identifier vendor] :as row}
                  (parse/parse-file (.getPath tempfile))]
-             (assoc row :imported false)))
+             (assoc row
+                    :imported false
+                    :potential-duplicate (boolean (seq (filter #(and (= vendor (:vendor %))
+                                                                  (= invoice-number (:invoice-number %)))
+                                                            existing-invoices)))
+                    )))
           {:status 200
            :body (pr-str (invoices/get-pending))
            :headers {"Content-Type" "application/edn"}}))
diff --git a/src/cljs/auto_ap/views.cljs b/src/cljs/auto_ap/views.cljs
index 740fa923..867e5ef8 100644
--- a/src/cljs/auto_ap/views.cljs
+++ b/src/cljs/auto_ap/views.cljs
@@ -112,15 +112,18 @@
                     [:th "Customer"]
                     [:th "Invoice #"]
                     [:th "Date"]
-                    [:th "Amount"]]]
-                  [:tbody (for [{:keys [vendor customer-identifier invoice-number date total id] :as i} @invoices]
+                    [:th "Amount"]
+                    [:th]]]
+                  [:tbody (for [{:keys [vendor potential-duplicate customer-identifier invoice-number date total id] :as i} @invoices]
                             ^{:key (str customer-identifier "-" invoice-number "-" date "-" total "-" id)}
-                            [:tr
+                            [:tr 
                              [:td vendor]
                              [:td customer-identifier]
                              [:td invoice-number]
                              [:td date]
-                             [:td total]])]]
+                             [:td total]
+                             [:td (when potential-duplicate
+                                    [:i.icon.fa.fa-warning {:title "potential duplicate"}])]])]]
                  [:span "No pending invoices"]))]
             (if (and (seq @invoices) (not (:loading @status)))
               [:div.card-footer
@@ -279,4 +282,3 @@
          [:a {:class "icon", :href "https://github.com/dansup/bulma-templates"}
           [:i {:class "fa fa-github"}]]]]]]
      [:div#dz-hidden]]))
-