Question:
Can a person do TESHUVA with VIDUI/ just CHATATI (I have sinned) on SHABBOS/ YOM TOV? On SHABBOS we don't do TACHNUNIM, ect.Or is it preferable just to do TSHUVA without VIDUI or CHATATI?
Answer:
We do not say viduy on Shabbos at all. IN fact the poskim say that we do't say viduy until after chatzos on Motzei Shabbos, being that the kedusha of habbos is sstill with us until then.
Best wishes
Sources:
Sharei Teshuva O:CH 581, M:B 288-22,