diff --git a/lib/faker/default/company.rb b/lib/faker/default/company.rb
index e694f9802f..57d649c624 100644
--- a/lib/faker/default/company.rb
+++ b/lib/faker/default/company.rb
@@ -504,8 +504,9 @@ def indian_gst_number(state_code: nil)
 
           gen.letter(name: :z_char, length: 1, ranges: [['Z']])
 
-          gen.computed(deps: %i[state_code_param taxpayer_number registration_number]) do |state_code_param, taxpayer_number, registration_number|
-            gst_base = "#{state_code_param}#{taxpayer_number}#{registration_number}"
+          # The check character covers all 14 preceding characters, including the "Z"
+          gen.computed(deps: %i[state_code_param taxpayer_number registration_number z_char]) do |state_code_param, taxpayer_number, registration_number, z_char|
+            gst_base = "#{state_code_param}#{taxpayer_number}#{registration_number}#{z_char}"
             chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'.chars
             values = gst_base.chars
             sum = values.map.with_index do |char, index|
diff --git a/test/faker/default/test_faker_company.rb b/test/faker/default/test_faker_company.rb
index a6e1a6846e..75ee22de0d 100644
--- a/test/faker/default/test_faker_company.rb
+++ b/test/faker/default/test_faker_company.rb
@@ -254,6 +254,20 @@ def text_indian_gst_number
     assert_match(/^([0-2][0-9]|3[0-7])[A-Z]{3}[ABCFGHLJPTK][A-Z]\d{4}[A-Z][A-Z0-9]Z[A-Z0-9]$/i, @tester.indian_gst_number)
   end
 
+  def test_indian_gst_number_check_character
+    chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'.chars
+
+    10.times do
+      gst = @tester.indian_gst_number
+      sum = gst[0, 14].chars.each_with_index.sum do |char, index|
+        product = chars.index(char) * (index.odd? ? 2 : 1)
+        (product / 36) + (product % 36)
+      end
+
+      assert_equal chars[(36 - (sum % 36)) % 36], gst[14], gst
+    end
+  end
+
   def test_state_code_in_indian_gst_number
     assert_raise ArgumentError do
       @tester.indian_gst_number(state_code: '01')