Mistakenly Ate on Yahrzeit
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Question
Someone who is accustomed to fasting every year on the yahrzeit of his father, and mistakenly ate in the morning, should he complete the fast and should he make up the fast on another day?
Answer
One should complete the fast on the same day, and there is no need to make up the fast on another day, unless his intention was for atonement, in which case he should make it up on another day.
Source
Shulchan Aruch, Siman 568, Seif 1: "Vowed to fast on this day and forgot and ate, completes his fast; and the same applies if it was a dream fast, or a public fast, or a known day for him to fast on the day his father or teacher died."
Mishna Berura there, SK 8: "See Beit Meir, where he concludes that this applies only to one who says 'I will fast tomorrow,' but if he vowed to fast on a specific day and forgot and ate on it, according to all opinions, he must complete his fast and does not need to fast on another day unless his intention was for atonement for his sin and mistake. The same applies to a dream fast or yahrzeit, and certainly to the four established fasts or other public fasts, if he forgot and ate on it, he is certainly obligated to complete the fast and does not need to fast on another day unless his intention was for atonement, and so it is stated in Maharil, who instructed one to fast afterward for atonement."