diff --git a/requirements.txt b/requirements.txt
index 757931f..8318237 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 tornado==6.0.4
 isodate==0.6.0
 pytest==5.4.1
+schwifty==2020.9.0
diff --git a/validators/test_validators.py b/validators/test_validators.py
new file mode 100644
index 0000000..3094007
--- /dev/null
+++ b/validators/test_validators.py
@@ -0,0 +1,59 @@
+from validators import mandatory, empty, iso_date, valid_iban, valid_bic, valid_money_amount
+
+
+def test_mandatory():
+    assert mandatory("Foo") == True
+    assert mandatory("Foo Bar") == True
+    assert mandatory("1970-01-01") == True
+    assert mandatory("") == False
+    assert mandatory(None) == False
+
+
+def test_empty():
+    assert empty(None) == True
+    assert empty("") == True
+    assert empty(" ") == False
+    assert empty("Foo") == False
+    assert empty("1970-01-01") == False
+
+
+def test_iso_date():
+    assert iso_date("1970-01-01") == True
+    assert iso_date("1970-1-1") == True
+    assert iso_date("70-01-01") == False
+    assert iso_date("1970/01/01") == False
+    assert iso_date("1.1.1970") == False
+    assert iso_date("01.01.1970") == False
+    assert iso_date("") == False
+    assert iso_date(None) == False
+
+
+def test_valid_iban():
+    assert valid_iban("DE89 3704 0044 0532 0130 00") == True
+    assert valid_iban("DE89370400440532013000") == True
+    assert valid_iban("DX89 3704 0044 0532 0130 00") == False
+    assert valid_iban("DE99 3704 0044 0532 0130 00") == False
+    assert valid_iban("") == False
+    assert valid_iban(None) == False
+    assert valid_iban("DE89 3704 0044 0532 0130 00".split()) == False
+
+
+def test_valid_bic():
+    assert valid_bic("PBNKDEFFXXX") == True
+    assert valid_bic("PBNKDXFFXXX") == False
+    assert valid_bic("PBNKDXFFXXXX") == False
+    assert valid_bic("PBN1DXFFXXX") == False
+    assert valid_bic("") == False
+    assert valid_bic(None) == False
+    assert valid_bic("PBNKDEFFXXX".split()) == False
+
+
+def test_valid_money_amount():
+    assert valid_money_amount(None) == False
+    assert valid_money_amount("") == False
+    assert valid_money_amount("0,00") == False
+    assert valid_money_amount("13,37") == False
+    assert valid_money_amount("0") == True
+    assert valid_money_amount("0.00") == True
+    assert valid_money_amount("13") == True
+    assert valid_money_amount("13.37") == True
\ No newline at end of file
diff --git a/validators/validators.py b/validators/validators.py
new file mode 100644
index 0000000..8ce199d
--- /dev/null
+++ b/validators/validators.py
@@ -0,0 +1,54 @@
+import datetime
+from schwifty import IBAN, BIC
+
+
+def mandatory(field: str) -> bool:
+    return bool(field)
+
+
+def empty(field: str) -> bool:
+    return not bool(field)
+
+
+def iso_date(field: str) -> bool:
+    if not field:
+        return False
+    try:
+        datetime.datetime.strptime(field, "%Y-%m-%d")
+        return True
+    except ValueError:
+        return False
+
+
+def valid_iban(field: str) -> bool:
+    if not field:
+        return False
+    if not type(field) == str:
+        return False
+    try:
+        IBAN(field)
+        return True
+    except ValueError:
+        return False
+
+
+def valid_bic(field: str) -> bool:
+    if not field:
+        return False
+    if not type(field) == str:
+        return False
+    try:
+        BIC(field)
+        return True
+    except ValueError:
+        return False
+
+
+def valid_money_amount(field: str) -> bool:
+    if not field:
+        return False
+    try:
+        float(field)
+        return True
+    except (ValueError, TypeError):
+        return False
\ No newline at end of file