一、案情概述（匿名化处理）
【摘要】[Abstract] 不当得利制度具有严格的补充性，其构成须以"无合法依据"为要件，而非"目的未实现"。本文结合一则股东出资款返还纠纷典型案例，对不当得利认定中若干常见逻辑错误与制度偏差展开学术批评，以期引发争鸣。The unjust enrichment doctrine requires strict subsidiary application, with "absence of legal basis" as its constitutive element—not merely "purpose unfulfilled." This article critically examines common logical errors in unjust enrichment findings through a typical shareholder contribution dispute.
【案情】[Facts] 甲、乙系某目标公司股东。2019年，甲应目标公司财务人员要求，将合计40万元的股东出资款分两笔汇入乙的个人银行账户，用于完成认缴出资。但乙收款后未将该款项转入目标公司公账，而是用于公司日常经营支出。后因目标公司涉诉，甲被追加为被执行人，并在未出资范围内承担补充赔偿责任。甲遂以不当得利为由，请求乙返还该40万元。一审支持甲的诉讼请求，认定乙构成不当得利，应返还全部款项及利息。乙不服，提起上诉并提交再审申请，理由如下。Parties A and B were shareholders of a target company. In 2019, Party A transferred 400,000 yuan in two installments to Party B's personal account per the company's financial instructions for registered capital purposes. Party B did not transfer the funds to the company's public account, using them instead for business operations. Party A was subsequently added as an involuntary debtor in enforcement proceedings. Party A then brought an unjust enrichment claim. The first instance ruled in Party A's favor. Party B appeals and files for retrial on the grounds outlined below.
二、五项核心再审理由评析
（一）逻辑错误：以"目的未实现"替代"无合法依据"要件
不当得利的规范构造，要求得利人"没有合法依据"（无法律上原因）而取得利益。其内涵是自始不存在法律上的取得原因，而非取得后原因消灭，更非取得目的未能实现。
本案中，40万元款项的支付源于股东出资义务的安排，具有明确的给付原因。即使该出资在形式上未依《公司法》规定完成，其性质也仅属于"履行方式不规范"或"目的未实现"，并非"自始无法律依据"。In this case, the 400,000 yuan payment originated from a shareholder capital contribution arrangement with a clear payment purpose. Even if the contribution was procedurally defective under the Company Law, its nature is merely "irregular performance" or "purpose unfulfilled"—not "lacking legal basis from the outset."
批评：一审以结果（出资目的落空）反推构成要件（无合法依据），属于典型的"以结果评价替代构成要件分析"的逻辑错误。两审裁判均未对"无合法依据"这一核心要件进行独立判断，构成要件审查严重不足。The first instance used the outcome (failed contribution purpose) to reverse-engineer the constitutive element (lack of legal basis)—a classic logical error of substituting outcome evaluation for constitutive element analysis.
（二）法律适用顺序错误：违反不当得利的补充性原则
不当得利制度在民法体系中具有严格的补充性（subsidiary nature）。只有在基础法律关系不存在、无效或被撤销时，才能适用不当得利返还请求权。若当事人之间存在基础法律关系，则应当依据该基础关系寻求救济，而非径行适用不当得利。
本案中，甲、乙之间存在明确的股东出资安排——甲向乙支付款项用于完成对目标公司的出资，乙收款后代为转付。无论该安排是否规范，双方之间显然存在基础法律关系。一审、二审对此未作任何评价即直接适用不当得利，属于严重的法律适用顺序错误。A and B clearly had a foundational legal relationship—the shareholder contribution arrangement. The court should have evaluated this relationship first before considering unjust enrichment. Both instances skipped this analysis entirely, constituting a serious error in legal application sequence.
批评：正确路径应当是：首先评价出资关系的效力与履行状态；若认定出资未完成，应引导当事人通过补缴出资、变更出资方式等路径进行救济；只有在基础关系已被否定或根本不存在时，方可适用不当得利。The correct analytical sequence: (1) evaluate the validity and performance status of the contribution relationship; (2) if defective, guide parties toward supplementary contribution or alternative performance methods; (3) only if the foundational relationship is negated or nonexistent should unjust enrichment be applied.
（三）意思自治与风险分配失衡
通过目标公司财务人员的指示、以个人账户完成出资，是甲、乙双方的共同决策，并非乙单方擅自行为。款项汇入乙个人账户后，甲明知款项在乙个人账户中，仍长期未提出异议，应视为对资金在个人账户流转状态的默示认可。Using Party B's personal account per company financial instructions was a joint decision by both A and B—not Party B's unilateral act. Party A's long silence after the transfer, knowing funds remained in Party B's account, constitutes implied acceptance of this arrangement.
在此情形下，一审、二审判令乙单方承担全部返还责任，实质上是将双方共同决策产生的资金安全风险，全部归咎于一方，违反意思自治原则与风险自担原则。Holding Party B solely liable for the entire amount effectively transfers a jointly-created risk entirely onto one party—violating the principles of party autonomy and risk allocation.
批评：若要认定乙承担全部责任，至少应当审查：乙是否存在擅自截留的主观恶意？甲是否存在过错（如未核实款项到账、未及时要求出具出资证明）？一、二审均未考察，即作出单方归责的判决，事实基础严重不足。At minimum, the court should have examined: whether Party B had subjective intent to misappropriate; whether Party A bore fault (e.g., failing to verify receipt or request contribution proof). Neither instance examined these questions—leaving the factual basis severely deficient.
（四）损害未实际发生即判令全额返还，违背利益对应原则
甲被判承担的，是"在未出资范围内对目标公司债权人的补充赔偿责任"。该责任是否实际发生、实际发生的金额为多少，在原审裁判时均未确定。甲尚未实际支出任何款项，即获判全额返还40万元及利息。Party A was ordered to pay only supplementary liability within the unfunded scope to the company's creditors. Whether this liability would actually materialize and for what amount remained undetermined at judgment. Party A, who had not yet actually paid anything, was nevertheless awarded the full 400,000 yuan plus interest.
批评：这意味着：一方尚未实际受损（补充责任尚未实际履行），却已获赔全额；另一方（乙）尚未实际获利，却需承担全额返还责任。利益状态严重失衡，违背"受损与获利须具有对应关系"的基本原理。正确衡量，应以甲实际支出的金额为上限确定返还范围。This means: one party, having suffered no actual loss yet (supplementary liability unpaid), recovers the full amount; the other party, having not actually profited, bears full restitution. This severely violates the principle that restitution must correspond to actual benefit received.
（五）裁判路径选择失当：补正可能性未被考量
案涉40万元的本质是出资款。《公司法》允许股东以多种方式完成出资，程序瑕疵可以通过补缴、更正等方式予以补救，而不必径行认定为不当得利要求全额返还。The 400,000 yuan is, in substance, a capital contribution. Company Law permits various forms of contribution completion; procedural defects can be remedied through supplementary contribution or correction—without necessarily triggering unjust enrichment liability.
批评：裁判者在面对出资瑕疵时，应主动释明法律关系，引导当事人选择最符合制度目的的救济路径，而非以最简便的不当得利路径一判了之。选择补正路径的制度效益明显优于不当得利：维护公司资本制度完整性、保护公司债权人利益、尊重当事人之间的出资安排本意。Courts facing contribution defects should actively guide parties toward remedies that best serve institutional purposes, rather than reaching for the most convenient unjust enrichment path. A supplementary contribution approach better serves institutional goals: preserving corporate capital integrity and protecting creditor interests.
三、结论与延伸思考
本案两审裁判在逻辑构造与法律适用上均存在可质疑之处：核心问题在于混淆了"目的未实现"与"无合法依据"的内涵，违反了不当得利的补充性原则，在损害尚未确定时即判令全额返还，且未考量出资补正的可能性。Both instances exhibit legally questionable reasoning: confusing "purpose unfulfilled" with "absence of legal basis," violating the supplementary nature of unjust enrichment, awarding full restitution before actual loss was determined, and failing to consider remedial contribution pathways.
延伸思考：不当得利制度的滥用风险Extended Reflection: Risk of Abuse of Unjust Enrichment Doctrine
近年来，不当得利制度在公司纠纷中被频繁援引，其高返还性（本金+利息）使其成为部分当事人"以诉促谈"的工具，容易诱发道德风险。学术界应当进一步讨论：如何在制度层面设置更高的举证门槛？法院在审查不当得利构成要件时，应否引入"权利失效"抗辩？出资瑕疵的救济路径是否应当优先于不当得利返还？In recent years, unjust enrichment has been increasingly invoked in corporate disputes. Its high restitution nature (principal + interest) makes it a tool for "litigation as negotiation leverage," raising moral hazard concerns. Further scholarly discussion is warranted on: raising evidentiary thresholds, considering "obsolescence of rights" defenses, and whether contribution defect remedies should take priority over unjust enrichment claims.
本文系学术争鸣文章，意在促进法律适用的深度讨论。如有疏漏，欢迎批评指正。This article is intended for academic debate and legal discussion purposes only.