Must one take Maaser from presents that he received?
One is required to take Maaser off presents or donations that he receives. [From the letter of the law, this applies even to non-cash gifts [i.e. a silver Kiddush cup; a cell phone; a painting; etc]. However, the custom is to only take Maaser off from cash gifts.]
 See Hilchos Maaser Kesafim 3/5 p. 32
 Rabbeinu Yona in Sefer Hayirah 213; Takanas of Rosh printed in Maaser book p. 47; See Mateh Moseh 2/8; Pela Yoeitz Mareches Maaser
 The above Poskim do not differentiate; Pesakim of Rav SZ”A; Mishneh Halachos 12/241
 Derech Emuna Matanos Aniyim 7/67 in name of Chazon Ish; Maaser Kesafim 3/6