財務報導時效性是資訊品質的核心指標，許多國家針對該核心指標，制定相關規範及政策，以提升財報時效性，而為接軌國際，我國金管會亦逐步縮短年報公告期限。自2022年起，金管會規範實收資本額達100億元以上之上市櫃公司，須於財務報導年度終了日後75日內完成公告年報，此一制度變革不僅對受規範公司產生加速出具財報的壓力，亦可能因「同儕效應(Peer Effects)」對同產業內未受規範的同業造成影響。本研究旨在探討實收資本額達100億元以上之上市櫃公司因金管會規範而提前出具財報的行為，是否會帶動產業內其他實收資本額未達100億元之上市櫃公司主動跟進提前出具財報。本研究以2022年至2024年台灣一般產業之上市櫃公司為樣本，實證設計分為斷點迴歸分析及同儕效應檢驗兩部分。實證結果顯示，受規範公司在金管會政策實施後，其財報時效性之提升程度顯著高於鄰近門檻但未受規範之公司。此外，當同產業內受規範公司越早出具年報，未受規範公司亦會受同儕壓力驅動而顯著提早出具，此同儕效應在受規範公司數量占比較高的產業中尤為顯著（具體而言，受規範公司每提早1天公告，將驅動未受規範公司提早約 0.407天）。本研究於增額測試亦發現上述同儕效應將使未受規範公司的審計品質下降，但對審計公費無顯著影響。

Timeliness is a cornerstone of financial reporting quality. To align with international standards, Taiwan’s FSC mandated that listed companies with paid-in capital over NT$10 billion (large firms) disclose annual reports within 75 days starting in 2022. This study investigates whether this policy triggers "peer effects," prompting listed companies with paid-in capital under NT$10 billion (small firms) to accelerate their own filings. Analyzing Taiwanese listed companies from 2022 to 2024 via regression discontinuity and peer effect tests, the results confirm that the policy has a mandatory guiding effect. Crucially, when large firms report earlier, smaller peers follow suit due to competitive pressure. This peer effect intensifies in industries with a higher concentration of large firms. In practical terms, each day of early disclosure by a large firm triggers an estimated 0.407-day acceleration in the reporting timelines of smaller peers within the same industry. Further analysis also shows a negative impact on audit quality resulting from these peer effects; however, no significant correlation was found regarding audit fees.

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