O-S Inc is located at 1011 Pecten Ct, Milpitas, CA. This business specializes in Taxes. O-S Inc is open Mon, 9am-5pm; Tue, 9am-5pm; Wed, 9am-5pm; Thu, 9am-5pm; Fri, 9am-5pm; Sat, 10am-4pm; Sun, Closed and accepts All Major Credit Cards, American Express, Cash, Discover, Mastercard and Visa.