Halocho #1114 - What to do if one forgets יַעֲלֶה וְיָבוֹא?

On Rosh Chodesh one should add יַעֲלֶה וְיָבוֹא during the Amida and Birkat Hamazon.

If one forgot to add יַעֲלֶה וְיָבוֹא during the Amida at night one does not need to make amends. During the day one needs to go back to רצה.

If one forgot יַעֲלֶה וְיָבוֹא during Birkat Hamazon (during the day or night), and one remembers before starting the last Bracha, one can say:

בָּרוּךְ אַתָּה ה' אֱלקֵינוּ מֶלֶךְ הָעוֹלָם אֲשֶׁר נָתַן רָאשֵׁי חֳדָשִׁים לְעַמּוֹ יִשְׂרָאֵל לְזִכָּרוֹן

If one only realizes after starting the last Bracha, or one does not have the above Bracha readily available, then one does not need to make amends.
Source: Kitzur Shulchan Aruch 19:10, 44:14

Chodesh Tov!

- Danny
Sunday, 2nd day Rosh Chodesh Tamuz 5773