What is the practice and halakhic status of Kol Nidrei on the night of Yom Kippur?

Yom KippurKol Nidrei

Synopsis

Kol Nidrei is an ancient formula recited before nightfall on Yom Kippur. There is a dispute about whether it refers to past vows (Geonim/early versions) or future vows (Rabbenu Tam). Most Ashkenazim follow Rabbenu Tam. The Aruch HaShulchan holds it is not legally effective and functions only as prayer.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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