Yahrzeit is done each year, for a full day on the date of death according to the Hebrew calendar. The main halachic obligation is to recite the mourner's version of the Kaddish prayer three times (evening of the previous day, morning, and afternoon), and many attend synagogue for the evening, morning, and afternoon services on this day. During the morning prayer service the mourner's Kaddish is recited at least three times, two that are part of the daily service and one that is added in a house of mourning. Both there and in the synagogue, another Kaddish, the Rabbi's Kaddish, is also said in the morning service once in Nusach Ashkenaz and twice in Sfard/Sfardi.

As a widely practiced custom, mourners also light a special candle that burns for 24 hours, called a "Yahrzeit candle". Lighting a yahrtzeit candle in memory of a loved one is a minhag ("custom") that is deeply ingrained in Jewish life honoring the memory and souls of the deceased.

Some Jews believe that strict Jewish law requires that one should fast on the day of a parent's Yahrzeit; although most believe this is not required, some people do observe the custom of fasting on the day of the Yahrtzeit, or at least refraining from meat and wine. Among many Orthodox Jews it has become customary to make a siyum by completing a tractate of Talmud or a volume of the Mishnah on the day prior to the Yahrtzeit, in the honor of the deceased. A halakha requiring a siyum ("celebratory meal"), upon the completion of such a study, overrides the requirement to fast.