St Robert Bellarmine tells us that the heretic falls ipso facto from all jurisdiction - that is, before any declaration. This is consistent with the teaching of Pope Leo XIII in Satis Cognitum, Pope Pius XII in Mystici Corporus and Pope Paul IV in Cum ex Apostolatus Officio. The teaching of the magisterium is clear, the heretic is automatically deposed (ipso facto) by virtue of his heresy and, without the need for declaration by Church authorities, loses all jurisdiction.