Income Tax Act Article 49

Accounts receivable and notes receivable shall be evaluated at their respective amounts less deductions for estimated allowance for bad debts.Allowance for bad debts as set forth in the preceding Paragraph shall be estimated and set aside in an amount not exceeding 1% of the amount of outstanding balance of the accounts receivable and the notes receivable, or of the amount of outstanding balance of credits in the case of a financial institution.Where the percentage of bad debt losses actually incurred and declarable by a profit-seeking enterprise under the law exceeds the percentage specified in the preceding Paragraph, the allowance for such bad debts may be estimated and set aside in an amount not exceeding the average of the percentages of actual bad debts declarable by the said profit-seeking enterprise under the law in the preceding three years.For a profit-seeking enterprise, if it is found in the following year that the amount of all ascertained losses in bad debts differs from that of the estimated losses, an adjustment shall be made in the estimation of losses in bad debts for the current year to conform to the allowable percentage.Under any of the following circumstances, an account receivable or note receivable or any other item of uncollected credit may be deemed as an ascertained bad debts loss:1. Where the outstanding amount is wholly or partially uncollectible by reason of insolvency, dodging of the debtor, compromise or adjudication of bankruptcy, or any other cause;2. Where the outstanding amount has been past due for a period over two years during which neither the principal nor the interest accrued thereon has been paid despite demands made therefor.If the outstanding amount as set forth in the preceding Paragraph is collected after being written off as a loss, the amount actually collected shall be deemed as a profit for the year in which it is collected.
中文原文 所得稅法第49條
應收帳款及應收票據債權之估價,應以其扣除預計備抵呆帳後之數額為標準。
前項備抵呆帳,應就應收帳款與應收票據餘額百分之一限度內,酌量估列;其為金融業者,應就其債權餘額按上述限度估列之。
營利事業依法得列報實際發生呆帳之比率超過前項標準者,得在其以前三個年度依法得列報實際發生呆帳之比率平均數限度內估列之。
營利事業下年度實際發生之呆帳損失,如與預計數額有所出入者,應於預計該年呆帳損失時糾正之,仍使適合其應計之成數。
應收帳款、應收票據及各項欠款債權有左列情事之一者,得視為實際發生呆帳損失:
一、因倒閉逃匿、和解或破產之宣告,或其他原因,致債權之一部或全部不能收回者。
二、債權中有逾期兩年,經催收後,未經收取本金或利息者。
前項債權於列入損失後收回者,應就其收回之數額列為收回年度之收益。

English translation for reference only; the Chinese text prevails. Not legal advice.