diff --git a/ZahlungenForderungen.py b/ZahlungenForderungen.py
index 5a201fa..9212136 100644
--- a/ZahlungenForderungen.py
+++ b/ZahlungenForderungen.py
@@ -1,4 +1,6 @@
 from dbpool import getConnection, getOne, getMany
+import datetime
+import decimal
 
 def get_zahlungen_by_mieter(mieter_id):
   return getMany("""
@@ -15,7 +17,7 @@ SELECT id,
 def get_zahlung(id):
   return getOne("""
 SELECT id, 
-       mieter
+       mieter,
        datum_ist,
        datum_soll
        betrag,
@@ -28,7 +30,7 @@ SELECT id,
 def get_forderungen_by_mieter(mieter_id):
   return getMany("""
 SELECT id, 
-       mieter
+       mieter,
        datum,
        betrag,
        kommentar,
@@ -40,7 +42,7 @@ SELECT id,
 def get_forderung(id):
   return getOne("""
 SELECT id, 
-       mieter
+       mieter,
        datum,
        betrag,
        kommentar,
@@ -50,6 +52,8 @@ SELECT id,
 """, [ id ], "Forderung")
 
 def get_zahlungforderung_by_mieter_and_year(mieter_id, year):
+  if year == 0:
+    year = datetime.datetime.now().year
   start_date = "{}-01-01".format(year)
   end_date = "{}-12-31".format(year)
   return getMany("""
@@ -65,4 +69,38 @@ SELECT
 FROM zahlung_forderung
 WHERE mieter = ? AND
   datum_soll BETWEEN ? AND ?
-""", [mieter_id, start_date, end_date], "ZahlungForderung")
\ No newline at end of file
+""", [mieter_id, start_date, end_date], "ZahlungForderung")
+
+def get_saldo_by_mieter_and_year(mieter_id, year):
+  if year == 0:
+    year = datetime.datetime.now().year
+  start_date = "{}-01-01".format(year)
+  end_date = "{}-12-31".format(year)
+  sumZahlungen = getOne("""
+SELECT
+  ROUND(sum(betrag), 2) as sum
+FROM zahlung
+WHERE mieter = ? AND
+  datum_soll BETWEEN ? AND ?
+""", [mieter_id, start_date, end_date], "SumZahlung")
+  sumForderungen = getOne("""
+SELECT
+  ROUND(sum(betrag), 2) as sum
+FROM forderung
+WHERE mieter = ? AND
+  datum BETWEEN ? AND ?
+""", [mieter_id, start_date, end_date], "SumZahlung")
+  print("Zahlung: {}, Forderung: {}".format(sumZahlungen, sumForderungen))
+  decimal.getcontext().prec = 2
+  sumZ = sumZahlungen["sum"]
+  if not sumZ:
+    sumZ = 0
+  sumF = sumForderungen["sum"]
+  if not sumF:
+    sumF = 0
+  saldo = sumZ - sumF
+  return {
+    "forderungen": float(sumF),
+    "saldo": float(saldo),
+    "zahlungen": float(sumZ)
+  }
\ No newline at end of file
diff --git a/swagger.yaml b/swagger.yaml
index 22d4a85..7ce44cd 100644
--- a/swagger.yaml
+++ b/swagger.yaml
@@ -235,6 +235,29 @@ paths:
           description: No ZahlungForderung available
         500:
           description: Some server error
+  /hv/mieter/{mieter_id}/saldo/{year}:
+    get:
+      tags: [ "Mieter", "Zahlung" ]
+      operationId: ZahlungenForderungen.get_saldo_by_mieter_and_year
+      summary: Returns sum of Zahlungen for a given Mieter and a given year
+      parameters:
+        - name: mieter_id
+          in: path
+          type: integer
+          required: true
+        - name: year
+          in: path
+          type: integer
+          required: true
+      responses:
+        200:
+          description: Successful response
+          schema:
+            $ref: '#/definitions/Saldo'
+        404:
+          description: Neither Forderungen nor Zahlungen available
+        500:
+          description: Some server error
 
 
 definitions:
@@ -346,3 +369,13 @@ definitions:
         type: string
       mieter:
         type: number
+  Saldo:
+    description: Saldo type
+    type: object
+    properties:
+      forderungen:
+        type: number
+      zahlungen:
+        type: number
+      saldo:
+        type: number