Index: so_taxes.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/so_taxes/so_taxes.module,v
retrieving revision 1.1.1.2
diff -u -r1.1.1.2 so_taxes.module
--- so_taxes.module	17 Mar 2009 08:01:21 -0000	1.1.1.2
+++ so_taxes.module	11 Jun 2009 17:08:25 -0000
@@ -487,7 +487,7 @@
       
       $service_params = array(
         'TaxType' => $type,
-        'PostalCode' => $city,
+        'PostalCode' => $zip,
         'LicenseKey' => variable_get('so_taxes_license_key', '')
       );