diff --git a/registrasion/controllers/invoice.py b/registrasion/controllers/invoice.py
index da737a739e5e5c03fdf877e4b978bfa871809da5..03be199af1546d10e712da38be6233b1a47d93f1 100644
--- a/registrasion/controllers/invoice.py
+++ b/registrasion/controllers/invoice.py
@@ -5,6 +5,8 @@ from django.db import transaction
 from django.db.models import Sum
 from django.utils import timezone
 
+from registrasion.contrib.mail import send_email
+
 from registrasion.models import commerce
 from registrasion.models import conditions
 from registrasion.models import people
@@ -149,6 +151,8 @@ class InvoiceController(ForId, object):
 
         invoice.save()
 
+        cls.email_on_invoice_creation(invoice)
+
         return invoice
 
     def can_view(self, user=None, access_code=None):
@@ -314,3 +318,33 @@ class InvoiceController(ForId, object):
 
         CreditNoteController.generate_from_invoice(self.invoice, amount)
         self.update_status()
+
+    @classmethod
+    def email(cls, invoice, kind):
+        ''' Sends out an e-mail notifying the user about something to do
+        with that invoice. '''
+
+        context = {
+            "invoice": invoice,
+        }
+
+        send_email(invoice.user.email, kind, context=context)
+
+    @classmethod
+    def email_on_invoice_creation(cls, invoice):
+        ''' Sends out an e-mail notifying the user that an invoice has been
+        created. '''
+
+        cls.email(invoice, "invoice_created")
+
+    @classmethod
+    def email_on_invoice_change(cls, invoice, old_status, new_status):
+        ''' Sends out all of the necessary notifications that the status of the
+        invoice has changed to:
+
+        - Invoice is now paid
+        - Invoice is now refunded
+
+        '''
+
+        cls.email(invoice, "invoice_updated")