Shabbos Bulletin Parshas Matos 5776

Tefilla Halacha

It is ossur to eat or drink before Havdalah (except for water). But if one ate or drank, there is no penalty and he can make havdalah. But if he (or she) forgot atta chonantanu at maariv, AND ate or drank before havdalah, the person must repeat shemoneh essraiy, saying “atta chonantanu” before making havdalah.

The Biur Halacha is unsure what the din would be if the person went ahead and made havdalah, and is now asking what to do.