Term reference redirect after node save
You can set redirect state for your node form. For example

function my_module_form_alter( &amp;$form, &amp;$form_state, $form_id ){
  if($form_id == 'your_node_form_id') {
    $form['actions']['submit']['#submit'][] = '_mymodule_node_redirect'; 
  }
}

/**
 * Custom Submit Handler to set conditional redirection rule.
 */
function _mymodule_node_redirect($form, &amp;$form_state) {
  // If terms are already in the system.
  if($form_state['values]['your_taxonomy_field']['und'][0]['tid'] ==  'tid_to_compare_with') {
    $form_state['redirect'] = 'whereever you want';
 }
}