diff --git a/tap_mysql/discover_utils.py b/tap_mysql/discover_utils.py
index 143fa7a..885cfae 100644
--- a/tap_mysql/discover_utils.py
+++ b/tap_mysql/discover_utils.py
@@ -1,6 +1,8 @@
 # pylint: disable=missing-docstring,too-many-locals
 
 import collections
+from decimal import Decimal, BasicContext, localcontext, Context
+
 import itertools
 import pendulum
 import pymysql
@@ -269,6 +271,19 @@ def schema_for_column(column):  # pylint: disable=too-many-branches
 
         if data_type == 'decimal':
             result.multipleOf = 10 ** (0 - column.numeric_scale)
+            # This is complex.
+            # Emax specifies the maximum allowable exponent.
+            # For example, with 10 digits, 3 after decimal place (7 before) we have:
+            # >>> setcontext(Context(prec=10, Emax=7))
+            # >>> Decimal('1.0E+7').next_minus()
+            # Decimal('9999999.999')
+            before_dp = column.numeric_precision-column.numeric_scale
+            with localcontext(Context(Emax=before_dp, prec=column.numeric_precision)):
+                largest_decimal = Decimal('1.0E+' + str(before_dp)).next_minus()
+
+            result.maximum = float(largest_decimal)
+            # TODO: Unsigned.
+            result.minimum = float(-largest_decimal)
 
     elif data_type in JSON_TYPES:
         result.type = ['null', 'object']
diff --git a/tests/integration/test_tap_mysql.py b/tests/integration/test_tap_mysql.py
index b7c459f..8487703 100644
--- a/tests/integration/test_tap_mysql.py
+++ b/tests/integration/test_tap_mysql.py
@@ -83,7 +83,10 @@ def test_decimal(self):
         self.assertEqual(self.schema.properties['c_decimal'],
                          Schema(['null', 'number'],
                                 inclusion='available',
-                                multipleOf=1))
+                                multipleOf=1,
+                                maximum=float('9'*10),  # Default is DECIMAL(10,0)
+                                minimum=-float('9'*10),
+                                ))
         self.assertEqual(self.get_metadata_for_column('c_decimal'),
                          {'selected-by-default': True,
                           'sql-datatype': 'decimal(10,0)',
@@ -93,7 +96,10 @@ def test_decimal_unsigned(self):
         self.assertEqual(self.schema.properties['c_decimal_2_unsigned'],
                          Schema(['null', 'number'],
                                 inclusion='available',
-                                multipleOf=0.01))
+                                multipleOf=0.01,
+                                maximum=float('9'*3 + '.99'),
+                                minimum=0
+                                ),)
         self.assertEqual(self.get_metadata_for_column('c_decimal_2_unsigned'),
                          {'selected-by-default': True,
                           'sql-datatype': 'decimal(5,2) unsigned',
@@ -103,7 +109,10 @@ def test_decimal_with_defined_scale_and_precision(self):
         self.assertEqual(self.schema.properties['c_decimal_2'],
                          Schema(['null', 'number'],
                                 inclusion='available',
-                                multipleOf=0.01))
+                                multipleOf=0.01,
+                                maximum=float('9'*9 + '.99'),
+                                minimum=-float('9'*9 + '.99'),
+                                ))
         self.assertEqual(self.get_metadata_for_column('c_decimal_2'),
                          {'selected-by-default': True,
                           'sql-datatype': 'decimal(11,2)',