One may not cut nails during the week of Tishe Beav. One may cut nails during the three weeks, up until the week of Tishe Beav.
Erev Shabbos: If Tishe Beav falls on Shabbos one may cut his nails in honor of Shabbos. [However some Poskim rule one may only do so if he is accustomed to cut his nails on every Erev Shabbos. If however Tishe Beav falls on Sunday, one may cut his nails on Erev Shabbos even if he does not do so weekly.]
Need of a Mitzvah: It is permitted to cut nails for the need of a Mitzvah, such as for Tevila.
 Taz 551/13; Elya Raba 551/7; Chayeh Adam 133/17; Kitzur SHU”A 122/5; Derech Hachaim 4; Ben Ish Chaiy Devarim 13; M”B 551/20; Kaf Hachaim 551/48
Other opinions: Some Poskim rule it is permitted to cut nails throughout the nine days, even during the week of Tishe Beav. [M”A 551/11; Noda Beyehuda Kama Y.D. 99] Other Poskim rule one may not cut nails throughout the three weeks. [Kneses Hagedola 551/41] This is not the accepted custom.
 M”B ibid; Chayeh Adam 133/17; Kitzur SHU”A 122/5; Derech Hachaim 4; Ben Ish Chaiy Devarim 13; Kaf Hachaim ibid
 Elya Raba ibid; brought in Kaf Hachaim ibid
 M”B ibid
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