本研究係探析保險業在監理管制下，若有違監理標準之虞時，其經理人是否興起盈餘管理的動機，以避免不必要的監理成本。蓋保險監理最重要的目的為預防保險公司失卻清償能力，以保障被保險人的權益，並維持金融安定。在實施風險基礎資本制前，邊際清償能力的標準仍以保險法第143條第一項之規定為依歸，即保險業認許資產減除負債之餘額，未達實收資本之45%時，主管機關應命其於限期內，以現金增資補足之。若保險業不依第143條規定限期增資補足者，保險法第149條第二項授權主管機關應依情節輕重，分別處以派員監理、撤換負責人或有關人員、限期改組、甚至命其停業或解散。故本研究預期清償能力不佳的保險公司，其經理人會動用裁量性應計項目調整財務狀況，以跨過清償能力標竿，避免受到監理機關的注意與查核。另外，保險法對於保險業資金運用管道有所縮限，以驅使保險公司穩健地運用資金，預防保險公司因巨額投資損失致使清償能力敗壞。但隨著產業競爭度增強與低利率時代的來臨，保險公司在經營績效與保單預定利率的壓力下，是否會安於目前的投資限制，而放棄賺取投資報酬的機會。據此，本研究預期年度中持有短期有價證券總額超過或可能超過35%資金門檻的保險公司，其經理人會選擇處分位於利得部位的短期有價證券，以規避超過保險法第146條之1第一項第二款的門檻限制。同理，年度中持有合格的公司股票及公司債超過或可能超過35%資金門檻的保險公司，其經理人可能會選擇出售位於利得部位的股票或公司債，以規避超過146條之1第一項第三款的門檻限制。 　　在研究設計上，為捕捉各類操縱財務報表的淨影響，本研究採用總裁量性應計項目作為代理變數。在所有可用的裁量性應計項目估計模型中，研究指出Modified Jones模型顯示了相對較強的檢定力(Dechow et al. 1995)。因此本研究援引Modified Jones模型估計裁量性應計數字。其次，將該模型析出的裁量性應計數字與各類監理門檻距離組成一迴歸模型，以測試其關聯性強弱。實證結果如下：一、在產險業，保單持有人盈餘與實收資本之45%的距離愈小者，其盈餘管理幅度愈大。二、壽險業比較沒有利用裁量性應計項目來達到監理標準的動機。但依公司規模來看，大小公司行為仍有所差異，即相較於大公司，小公司利用裁量性應計項目來達到監理標準的動機較為強烈。根據本文實證研究結論，建議監理機關與被保險人應特別注意產險業及小壽險公司的財務狀況，並確認其清償能力之品質。 / This paper examined whether insurance companies have incentives to manipulate accounting accruals to appear more solvent and less risky. In Taiwan, virtually all industries are regulated to some degree, but insurance industry faces regulatory monitoring that is explicitly tied to accounting data. Insurance regulators required that insurers meet conditions for minimum financial health. It is frequency asserted that such regulations create incentives to manipulate financial statement to avoid regulatory intervention The primary hypothesis of this paper is that the incentive to manipulate financial statement is a decreasing function of the insurers’ difference between policyholders’ surplus and 45% of capital. This paper assumes that insurance managers use their reporting discretion to achieve solvency goal and avoid exceeding investment limits. Following Healy (1985), accruals-based measures are wide employed in test of earnings management hypothesis. In the past, the most frequency used techniques for estimating discretionary accruals are the cross-sectional versions of the modified Jones model. In this paper, the magnitude of earnings management is proxied by the discretionary accruals which are estimated by using a cross-sectional version of the modified Jones model and regressed by three differences of regulatory requirements which measure the insurers’ behavior under the regulation. The evidence indicates that when policyholders’ surplus of property-casualty insurers is closer to 45% of capital, the incentive to manipulate financial statement is stronger. On the other hand, life insurers have less incentive to manipulate financial statement, but relative to big size insurers, small size insurers have stronger incentive to meet regulatory requirements.

本研究係以裁量性應計數字及其組成成分衡量盈餘管理，以審計人員產業別市場佔有率與產業別客戶集中度之綜合衡量捕捉審計品質，探討不同樣本公司之盈餘管理特性，以及審計品質對不同盈餘管理特性之影響。管理者對應計項目的認列通常有某種裁量權，此裁量權可用以顯露私有資訊而增進盈餘的價值攸關性，或可投機性地管理盈餘而減低盈餘為公司績效衡量的可靠性。所以探究盈餘管理行為是增加財務報告資訊性(information)或雜訊(noise)即非常重要。研究內容依盈餘管理特性區分為投機性盈餘管理與訊息發放性盈餘管理二大部分。每一研究內容則是先辨認盈餘管理本質，其次探討審計品質對盈餘管理之影響。在研究設計上，為避免實證代理變數之衡量誤差重大影響結果，乃採用實驗組公司與控制組配對公司相比較，以凸顯出前者之盈餘管理型態。 　　研究結果顯示，門檻公司從事盈餘管理以達前期盈餘門檻，且此盈餘管理不具未來現金流量持續性之涵義，係符合「隱藏當期不利績效、遞延本期不尋常盈餘至未來年度」以減低會計盈餘數字波動性之特性。就自願性盈餘預測此一資訊揭露工具而言，在盈餘預測偏屬樂觀之傾向下，仍有管理者自願揭露壞消息預期，即可知管理者之誠意，不失為一可資信賴之訊號。但自願預測盈餘增加，則不必然具有高公信力。甚至在管理者降低盈餘差距之動機下，易引起管理者操縱盈餘。此為財務報表使用者所需注意。就持股變動此一資訊揭露工具而言，在我國家族企業居多之情形下，增加持股並未代表任何特定之涵義。反而是減少持股所透露之訊息，值得投資人注意，尤須慎防其盈餘操縱行為。 　　面對增加所得之裁量性應計數字，審計品質有效阻止投機性盈餘管理。面對顯露私有資訊之盈餘管理，審計品質能夠協助管理者選擇最能彰顯未來現金流量預期之會計方法，以增強裁量性應計數字與未來現金流量變動之關聯性。在高審計品質所賦予之資訊公信力下，盈餘資訊在投資人之決策過程中有一定之重要性，故投資人發現裁量性應計數字增加（減低）盈餘價值攸關性，因而增加（減低）盈餘評價係數。然而對低審計品質所查核的財務報表，較低的資訊公信力，使盈餘未在投資人評價過程中扮演重要角色，因而盈餘管理特性亦不受投資人重視。 / This research examined characteristics of earnings management and effects of audit quality therein. Specifically, the magnitude of earnings management was proxied by the discretionary accruals, which are estimated using a cross-sectional version of the Jones model. Different from prior research, the audit quality was captured by a combined measure of the auditor's market share and client concentration. The market share measured the auditor's competence (industry specialty) and the client concentration measured the auditor's independence. Managers usually exercised discretion to recognize accruals. They could either signal private information to enhance earnings' value relevance, or opportunistically manage earnings to reduce the reliability of earnings as the performance measure of the firm. As a result, it was important to examine earnings management and to identify whether it would increase the informativeness or noise of financial reports. This study was organized according to the characteristics of earnings management: opportunistic earnings management and signaling earnings management. For both parts, the nature of earnings management was identified first, and then the effects of audit quality therein examined. To reduce the impact of measurement errors of proxy variables, the treatment group and controlled group were compared and contrasted to make earnings management pattern of the treatment group more evident. 　　The results showed that threshold firms managed earnings to sustain last year's earnings level. Discretionary accruals of the threshold firms were not significantly associated with future cash flow changes. Those discretionary accruals were used to hide the current unfavorable performance, or to defer current unusual earnings to the future, so that managers could reduce the volatility of accounting earnings. As a means of information disclosure, voluntary earnings forecasts tended to be optimistic, but we still could observe some voluntary forecasts which decreased earnings. In those situations, we might conclude that managers tried to convey credible signals. However, it was not necessarily credible in the case of voluntary forecasting which increased earnings. Managers would manipulate earnings to reduce the difference between forecasted earnings and reported earnings. In respect of the information signal of changes in directors' share holding percentages, it signaled nothing when directors increased holding percentages because most companies were family businesses in Taiwan. Nonetheless, investors should look out the possibility of earnings manipulation when directors decreased their holding percentages. 　　Audit quality could effectively deter opportunistic earnings management but not the income-decreasing discretionary accruals. Based on information signaling perspective of earnings management, auditors with higher audit quality tended to assist managers to choose accounting methods that might signal cash flow expectations. Stronger associations between discretionary accruals and future cash flows were observed for firms audited by higher quality auditors. Because higher audit quality might increase information credibility, earnings would play a more important role in the decision process of investors. When discretionary accruals increased (decreased) earnings' value relevance, earnings association coefficients would be increased (decreased). However, for the financial reports audited by lower quality auditors, earnings did not play an important role in the valuation process because of lower information credibility. Therefore, empirical results showed that investors of firms audited by lower quality auditors did not make decisions according to different characteristics of earnings management.