Siman 556

Tisha B'Av that falls on Sunday, how should one act regarding havdalah? For to perform havdalah while it is still day and to drink the cup is impossible, since once he has performed havdalah, he has accepted Tisha B'Av upon himself, and it is forbidden to drink (Tur). Therefore, on Saturday night, when he sees the candle, he recites the blessing "Who creates the lights of the fire." And over the spices he should not recite a blessing, for even though it is permitted to smell spices on Tisha B'Av, nevertheless, since spices on Saturday night come to restore the soul, it is not proper to do so on Tisha B'Av.

And on the night of the conclusion of Tisha B'Av—one recites havdalah over a cup. And then, he does not recite havdalah over the candle nor over the spices. For over the candle—he already recited the blessing, and spices are only relevant on the conclusion of Shabbat. And he should also not recite havdalah over wine, but rather over other beverages, for wine is forbidden on the conclusion of Tisha B'Av, even when it is postponed to Sunday, as I will write in siman 558. And know that even according to the one who holds in siman 299 that there is no completion for havdalah except on Sunday, nevertheless regarding Tisha B'Av—he admits that one recites havdalah at the beginning of Monday, since it was not possible to recite havdalah until now. And one who fasts two days—should hear havdalah from others (Magen Avraham). And "borei meorei ha-esh" one can bless all through the night of the conclusion of Shabbat, and no longer.