diff --git a/stdnum/__init__.py b/stdnum/__init__.py
index cbca9252..582c2f95 100644
--- a/stdnum/__init__.py
+++ b/stdnum/__init__.py
@@ -178,4 +178,4 @@
 
 
 # the version number of the library
-__version__ = '1.7'
+__version__ = '1.8'
diff --git a/stdnum/nz/__init__.py b/stdnum/nz/__init__.py
new file mode 100644
index 00000000..538d0289
--- /dev/null
+++ b/stdnum/nz/__init__.py
@@ -0,0 +1 @@
+from stdnum.nz import ird
\ No newline at end of file
diff --git a/stdnum/nz/ird.py b/stdnum/nz/ird.py
new file mode 100644
index 00000000..60740d51
--- /dev/null
+++ b/stdnum/nz/ird.py
@@ -0,0 +1,63 @@
+from stdnum.exceptions import *
+from stdnum.util import clean
+import string 
+import re
+
+"""
+NZ IRD numbers
+
+https://www.ird.govt.nz/resources/d/8/d8e49dce-1bda-4875-8acf-9ebf908c6e17/rwt-nrwt-spec-2014.pdf
+
+"""
+
+def compact(number):
+    return re.sub('[^0-9]','', number)    
+
+def checksum(number):
+    weights = [3, 2, 7, 6, 5, 4, 3, 2]
+    weights2 = [7, 4, 3, 2, 5, 2, 7, 6]    
+    
+    def calc_cksum(weights, number):
+        r = sum( w *int(n) for w, n in zip(weights, number)) % 11
+        if r == 0:
+            return 0
+        else:
+            return 11 - r
+    
+    csum = calc_cksum(weights, number)
+    if csum < 10:
+        return csum
+    else:
+        csum = calc_cksum(weights2, number)
+        if csum < 10:
+            return csum
+        else:
+            raise InvalidChecksum()
+
+def validate(number):
+    num_str = compact(number)
+    if not 8 <= len(num_str) <= 9:
+        raise InvalidLength()
+    if 10**7 < int(num_str) < 15*10**7:
+
+        if len(num_str) == 8:
+            num_str = '0' + num_str
+        try:
+            chk = checksum(num_str[0:-1])
+            if chk == int(num_str[-1]):
+                return num_str
+        except InvalidChecksum:
+            raise
+    else:
+        raise InvalidLength() 
+
+def is_valid(number):
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+if __name__ == "__main__":
+    irds = ['109 682 624','63 178 640', '63-563-803', '123456789', '24-882-403']
+    y = [is_valid(x) for x in irds]
+    print(y)
\ No newline at end of file