Removing “Allowed Tags” on the comment form.

This solution is from the wordpress forums from Emsi.  It is not guaranteed to work on all themes, but it did work fine for me on my theme based on twenty ten.

Follows these steps:

1. back up your functions.php file.

2. Add the following to your functions.php file
function my_comment_form_args($user_identity, $post_id, $req) {
$args = array(
‘comment_notes_after’ => ”
);
return $args;
}
3. then replace <?php comment_form();?> with <?php comment_form( my_comment_form_args($user_identity, $post->ID, $req) ); ?> in your comments.php file. That should be the last line.

Thats it.

To see the full thread, visit http://wordpress.org/support/topic/solved-allowed-tags-in-comment-form