One in three Singaporean business owners still use their personal bank accounts for their company banking needs, trying to escape high transaction fees, according to a survey from MariBank, a digital bank owned by Southeast Asian tech firm Sea. That creates tax and legal headaches, as business owners find it difficult to deduce their legitimate profit and deductions come tax season.  “Our local banks are good, and international banks also have a strong presence here,” Natalia Goh, MariBank’s CEO, told Fortune. “But there are certain banking needs that are still underserved.” MariBank’s answer is a business account with zero transaction…