The purpose of this paper is to identify the determinants of complaint and ombudsman ratios in the life insurance industry. Using complaint and ombudsman data on life insurers in Taiwan from 2012 to 2021, we find that insurers with higher solvency and smaller size have more complaints; when regulatory budget expenses rise, insurers that sell more investment-linked products and have higher solvency experience higher ombudsmen ratios, while state-owned insurers with a higher level of health insurance premiums have lower ombudsman ratios. We further find that complaint cases from smaller insurers that sell more health insurance and more profitable insurers that belong to financial holding companies have the characteristic of being relatively easy to settle.