Women and men are both equally chayiv in kiddush, at least on shabbos. Additionally there is a commonly known rule that a non obligated person (or obligated on a lower level) cannot fulfill a mitzvah on behalf of somone who is obligated. I’ve heard it said in the name of Rabbi Akiva Eger that men can make kiddush for women even after davening (and becoming only rabbinicly obligated) because in fact they're still obligated מדאורייתא because they intended not to "give up" their obligation.

But what about on Shabbos day, where they actually make kiddush in shul then go home? Then they aren't obligated anymore because they DID intend to get rid of their obligation and the women are still obligated rabbinically (it's day so it's not מדאורייתא).

So why the common Minhag for men is to eat kiddush at shul and still make kiddush for their family's at home?

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    אע"פ שיצא מוציא, but then you're getting into the machlokes if there is arvus for women. See MB and Shaar HaTziyun 271 – robev Nov 6 '18 at 4:34
  • @rovev What's your first quote saying? And what is 'arvus'? – Orion Nov 6 '18 at 4:40
  • Sorry I don't have time to write a formal answer. Here's some sources: sefaria.org/… – robev Nov 6 '18 at 5:10
  • Dealing with the part of the question about controlling/suppressing fulfillment of the mitzva during the day: judaism.stackexchange.com/q/60347/3 @robev – WAF Nov 6 '18 at 8:03
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    @loewian A) Isn't cake considered a seudah? It's Mizonot. Plus many kiddeishim also have meat and other things. B) I don't think different obligations will help even if they are both the same level. If being obligated in a action because of one mitzvah would allow you to do a mitzvah on behalf of somone else with that action, then wouldn't women be able to do any mitzvah for a man by swearing to that mitzvah? She'd be obligated on the same level also – Orion Nov 6 '18 at 22:07

R' Akiva Eiger in fact says (in Orach Chaim 271) that men can say kiddush after davening despite already having fulfilled their obligation, as in the first place they both have the same obligation. Those who argue (Dagul Mervava) maintain that there is a problem even on Friday night.

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