The rent is prepaid on a quarterly basis. The months of January, April, July and October are the payment month of each quarter. When the rent is terminated half-way, the refund is based on whole months – remaining days less than 30 days are not refunded. It's OK if the renter claims to waive the refund. There is an extra NT$400 deposit fee for the key, which should be returned after lease termination for the deposit back. You can go to your neighborhood post office to apply for the service.