Updated on 2024/10/18

写真a

 
Masahiro KOZUKA
 
Organization
Faculty of Humanities and Social Sciences Professor
Position
Professor
Profile

博士(法学)

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Degree

  • LL.D. ( Kyoto University )

Research Interests

  • Tax Law

  • 税法

Research Areas

  • Humanities & Social Sciences / Public law

Education

  • Kyoto University   法学研究科   法政理論専攻

    - 2014

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    Country: Japan

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  • Kyoto University    

    - 2014

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  • Kyoto University   法学部  

    - 2005

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    Country: Japan

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  • Kyoto University    

    - 2005

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Research History

  • - Associate Professor,Graduate School of Humanities and Social Sciences,Okayama University

    2013

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  • - 岡山大学社会文化科学研究科 准教授

    2013

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Professional Memberships

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Papers

  • コンピュータサイエンスの観点から—租税法の過去・現在・未来 ; コンピュータサイエンスと税制 Invited

    小塚 真啓

    租税法研究 = Japan tax law review / 租税法学会 編   ( 50 )   237 - 246   2022.6

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    Language:Japanese  

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  • 税務行政のデジタル化の将来—特集 租税国家のメタモルフォーゼ

    小塚 真啓

    法律時報   94 ( 5 )   21 - 25   2022.5

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    Language:Japanese  

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  • 令和4年度税制改正大綱を評価する : グループ通算制度の投資簿価修正を中心に—特集 令和4年度税制改正の評価と検討

    小塚 真啓

    税研 : 租税の総合専門誌 : Zeiken / 編集委員会 編   38 ( 1 )   48 - 52   2022.5

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  • 法人税法施行令にいう「国内にある事務所に属する資産又は負債」の意義と”パススルー”の交錯――塩野義製薬事件 Invited

    KOZUKA Masahiro

    Monthly jurist   ( 1557 )   154 - 155   2021.4

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  • Conflict between Inside and Outside Basis in Consolidated Corporate Tax System Reviewed

    Masahiro Kozuka

    Okayama Law Journal   70 ( 3・4 )   590 - 555   2021.3

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  • Changes in procedures and interpretations in emergencies : Ministry of Finance's response to lack of masks and hand sanitizers Reviewed

    Masahiro Kozuka, Keita Oda

    Okayama Law Journal   70 ( 1 )   72 - 58   2020.8

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  • 連結納税改革2020の評価と展望―ポスト・コロナにおける『法人課税のクロノトポス』の変容可能性を探る―

    Masahiro Kozuka

    ( 849 )   168 - 203   2020.7

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  • An analysis of the reform of Japanese Consolidated Tax Return System Invited

    Masahiro Kozuka

    36 ( 1 )   47 - 53   2020.5

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  • 法人税法132条の2の不当性要件の意義と予測可能性‐ヤフー事件

    KOZUKA Masahiro

    35 ( 4 )   23   2019.11

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  • 日本版パススルー課税制度に向けた覚書

    Masahiro Kozuka

    ( 840 )   95 - 124   2019.10

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  • 連結納税における投資簿価修正の意義と展望 : 連結納税の見直しを契機として

    Masahiro Kozuka

    ( 834 )   280 - 322   2019.4

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  • The Basic Functions of Basis : Theory and Doctrine in Income Tax Systems Reviewed

    Masahiro Kozuka

    Okayama Law Journal   68 ( 3・4 )   788 - 742   2019.3

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  • The Concept of Dividend in Japanese Income Tax: Past, Now and Future Invited Reviewed

    Masahiro Kozuka

    Nichizeiken-ronshu   ( 74 )   217 - 249   2018.9

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  • 法人税の現状と課題

    Masahiro Kozuka

    ( 826 )   20 - 51   2018.8

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  • 駐車場が地方税法三四九条の三の二第一項に定める併用住宅の敷地の用に供されている土地に該当する場合[東京地裁平28.11.30判決]

    Masahiro Kozuka

    ( 2368 )   154 - 159   2018.7

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  • 租税法入門 租税法のススメ Invited

    Masahiro Kozuka

    Hougaku seminar   63 ( 5 )   26 - 31   2018.5

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  • Re-Reconsideration of Macomber Reviewed

    Masahiro Kozuka

    Okayama Law Journal   67 ( 3・4 )   518 - 477   2018.3

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  • Are "Anti-Abuse Rules" Good or Bad? Invited Reviewed

    Masahiro KOZUKA

    Zei-ho-gaku   ( 578 )   55 - 77   2017.11

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  • Executive Retirement Benefits - Impact of Revisions and Future Issues Invited

    Masahiro Kozuka

    33 ( 3 )   68 - 73   2017.9

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  • 申告型大衆所得税を問いなおす―Lawrence Zelenak, LEARNING TO LOVE FORM 1040: TWO CHEERS FOR THE RETURN-BASED MASS INCOME TAX (The University of Chicago Press, 2013, pp.1 + 161)

    Masahiro Kozuka

    AMERIKA HO   2016(2) ( 2 )   263 - 269   2017.6

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  • 日本版スピンオフ税制の課題

    KOZUKA Masahiro

    ( 812 )   190 - 237   2017.6

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  • 家族の所得と租税 Invited Reviewed

    Masahiro KOZUKA

    37 - 66   2017.6

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  • 法人税法132条の2の不当性要件の意義とその判断枠組み――ヤフー事件 Invited

    KOZUKA Masahiro

    Monthly jurist   ( 1505 )   214 - 215   2017.4

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  • 税法上の配当概念の過去・現在・未来

    KOZUKA Masahiro

    ( 800 )   370 - 405   2016.6

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  • 譲渡所得における取得費の引継ぎ-ゴルフ会員権贈与事件 Invited

    Masahiro Kozuka

    ( 228 )   86 - 87   2016.6

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  • 収益事業の意義-ペット葬祭業事件 Invited

    Masahiro Kozuka

    ( 228 )   94 - 95   2016.6

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  • 所得控除方式のあり方

    KOZUKA Masahiro

    31 ( 6 )   43 - 49   2016.3

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  • Carryover or Cost: What is the Rational of Tax Deferral in Corporate Reorganizations? Reviewed

    KOZUKA Masahiro

    Okayama Law Journal   65 ( 3・4 )   949 - 1004   2016.3

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  • 債務免除益の法的・経済的性質と所得分類

    KOZUKA Masahiro

    ( 795 )   74 - 103   2016.1

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  • 家族の所得と租税―個人単位での所得の把握か,それとも家族単位か―

    KOZUKA Masahiro

    ( 793 )   80 - 105   2015.11

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  • 「租税回避」防止立法としての法人税法23条3項 Invited Reviewed

    Masahiro Kozuka

    265 - 297   2015.9

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  • 租税判例速報 源泉所得税不納付犯の処罰事例[仙台高裁平成27.1.20判決]

    KOZUKA Masahiro

    Monthly jurist   ( 1483 )   10 - 11   2015.8

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  • Extraordinary Dividend, Tax Avoidance, and GAAR

    KOZUKA Masahiro

    Okayama Law Journal   64 ( 3・4 )   568 - 518   2015.3

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  • 判例紹介 地方税法三四三条二項後段の「現に所有している者」[最高裁第二小法廷平成27.7.17判決] Invited

    Masahiro KOZUKA

    151 ( 6 )   564 - 570   2015.3

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  • 連結欠損金額

    KOZUKA Masahiro

    30 ( 4 )   122 - 125   2014.11

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  • 法人税法施行令121条1項1号のヘッジ取引の有効性の判定方法―アリコジャパン事件

    KOZUKA Masahiro

    Monthly jurist   ( 1466 )   212 - 213   2014.4

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  • Reconstruction of corporate income tax : Taxes and agency costs

    KOZUKA Masahiro

    Okayama Law Journal   63 ( 2 )   293 - 306   2013.12

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  • 公社債等及び株式等に係る所得に対する個人所得課税の改正を検討 税制改正大綱を評価する : 税法学の視点から (特集 平成25年度税制改正大綱の概要と評価) Invited

    KOZUKA Masahiro

    29 ( 1 )   61 - 66   2013.5

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  • 租税判例速報 ノンリコース債務免除益の所得分類が争われた事例[国税不服審判所裁決平成24.3.21] Invited

    KOZUKA Masahiro

    Monthly jurist   ( 1452 )   8 - 9   2013.4

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  • Louis Kaplow の人間資本論についての覚書 Invited Reviewed

    KOZUKA Masahiro

    28 ( 4 )   92 - 98   2012.11

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  • 輸出取引にかかる収益の計上時期 Invited

    Masahiro Kozuka

    ( 207 )   120 - 121   2011.12

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  • 譲渡所得の意義 Invited

    Masahiro Kozuka

    ( 207 )   74 - 74   2011.12

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  • Resent cace series on American law (3)

    Masahiro KOZUKA

    Kanazawa law review   54 ( 1 )   123 - 139   2011.7

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)   Publisher:The Faculty of Law, Institute of Human an Social Sciences, University of Kanazawa  

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  • Outside basis with respect to subsidiary after 2010 tax reform in Japan (1)

    Masahiro KOZUKA

    Kanazawa law review   54 ( 1 )   1 - 46   2011.7

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)   Publisher:The Faculty of Law, Institute of Human an Social Sciences, University of Kanazawa  

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    Other Link: http://hdl.handle.net/2297/28974

  • Reliable Streaming Transmission Using PR-SCTP Reviewed

    Tomotaka Maeda, Masahiro Kozuka, Yasuo Okabe

    2009 Ninth Annual International Symposium on Applications and the Internet   278 - 279   2009.7

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    Combination of RTP and UDP is commonly used in real-time video streaming, today. In fear of packet loss, FEC may be used to recover the lost packet data in RTP. But there is a limit in the tolerance to a burst packet loss. We propose to transmit real-time video streams that have tolerance to a burst packet loss by combining RTP with PR-SCTP. By retransmission within the range of the delay restriction specified by PR-SCTP while doing buffering, the tolerance to a burst packet loss can be improved in exchange for some delay.We have implemented the proposed method as a translator of RTP in consideration of interoperability with the existing application implemented with RTP/UDP. And we artificially caused the burst-packet loss as an experiment in the translator and evaluate the outcome of an experiment.

    DOI: 10.1109/saint.2009.64

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  • A commentary on the Supreme Court's judgement: an article which authorizes the mayor to determine the amount of insurance fee is legal

    Masahiro KOZUKA

    165 ( 2 )   121 - 141   2009.5

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  • A Modification of SCTP ADD-IP Feature for Bundling of Address Configuration Change Chunks Reviewed

    MARUYAMA Shin,KOZUKA Masahiro,NAKAMURA Motonori,OKABE Yasuo

    The transactions of the Institute of Electronics, Information and Communication Engineers. B   91 ( 10 )   1231 - 1233   2008.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • A Connectivity-Driven Retransmission Scheme Based On Transport Layer Readdressing Reviewed

    M Honda, J Nakazawa, Y Nishida, M Kozuka, H Tokuda

    277 - 285   2008.6

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  • A study of the criteria for capitalization Reviewed

    Masahiro KOZUKA

    Zei-ho-gaku   ( 558 )   99 - 127   2007.11

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  • A Virtual Machine Solution for Large Scale Educational Computer Systems Reviewed

    MARUYAMA SHIN,SAITA KEN-ICHI,KOZUKA MASAHIRO,ISHIBASHI YOSHIKO,IKEDA KOKOLO,MORI MIKIHIKO,KITA HAJIME

    IPSJ Journal   46 ( 4 )   949 - 964   2005.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Information Processing Society of Japan (IPSJ)  

    This paper discusses a new method to construct educational computer systems with virtual machine technology, which serve two operating systems, i.e., Windows and UNIX on each terminal simultaneously. First, we propose a construction technique of the home directory, which can be simultaneously accessed from the both OSs in large-scale systems which consist of more than 1,000 terminals. In the proposed technique, SMB protocol needed for Windows is handled not by a single server but by each user terminal separately. We also propose a technique of performing application of security fixes and making a change of a system setup on that spot while we use hibernation in order to shorten the starting time of UNIX working on a virtual machine. A large-scale educational computer system based on these proposals was built, and its performance was evaluated. Consequently, we have confirmed that, (1) The home directory is offered with its performance satisfactory speed and stability in practical educational usage. (2) By choosing the technique of changing files of UNIX considering the quantity and urgency of update, the proposed technique can be used also by the large-scale system, and the starting time of UNIX including updating work is also within the range of practical usage.

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Books

  • 税法上の配当概念の展開と課題

    成文堂  2016  ( ISBN:4792305888

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  • シティズンシップ課税

    Southern California Law Review  2016 

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  • Citizenship Taxation

    2016 

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  • Stream Control Transmission Protocol (SCTP) Dynamic Address Reconfiguration

    Internet Engineering Task Force (IETF)  2007 

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Presentations

  • コンピュータサイエンスと税制:コンピューターサイエンスの観点から Invited

    小塚真啓

    租税法学会第50回記念総会  2021.10.17 

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    Event date: 2021.10.16 - 2021.10.17

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

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  • リッチな情報流通・連携を実現せよ:社会実装のためのICT・社会科学の高度連携を目指して

    Masahiro Kozuka

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    Event date: 2021.3.29

    Presentation type:Oral presentation (general)  

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  • 研究開発と税制

    租税法学会第46回総会  2017 

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  • A Comparative Study on Anti-dividend-stripping Measures

    Sydney-Tokyo Tax Conference  2015 

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  • Policy-based IP Address Selection in SCTP Automatic Address Reconfiguration

    The 1st International Workshop on Protocols and Applications with Multi-Homing Support  2011 

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  • TCP Multi-Home Options

    The Fifth Workshop on Internet Technology (WIT2003)  2003 

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Awards

  • 第45回日本公認会計士協会学術賞

    2017  

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    Country:Japan

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  • 若手トップリサーチャー研究奨励賞

    2017  

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    Country:Japan

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  • 第23回 WIDE賞

    2009  

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    Country:Japan

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Research Projects

  • 租税法規の趣旨・目的に関する検討分析-租税法学及び政治学による共創的アプローチー

    Grant number:24K04538  2024.04 - 2027.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    小塚 真啓

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

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  • ベイシスの高度化による法人課税の再生

    Grant number:18H00795  2018.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    岡村 忠生, 渡辺 徹也, 高橋 祐介, 酒井 貴子, 小塚 真啓

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    Grant amount:\17030000 ( Direct expense: \13100000 、 Indirect expense:\3930000 )

    本年度は、研究の2年目として、消費課税とベイシスの不在や法人課税の多元性とベイシスに着目し、ベイシスの複合や連動などを念頭に置いた高機能なベイシスのあり方を軸に、現実に存在する具体的な事象を踏まえた検討を行った。
    法人組織に関し、企業法がインセンティブ・バーゲニングに与える影響を基軸にしつつ税制がさらにそれに与える/受ける影響、個人が法人へ非上場株式を譲渡した場合のみなし譲渡課税、返還債務を基軸とした法人税法上の公正処理基準のあり方、株式交付制度と課税のあり方、擬似ストックオプション制度課税、関連会社に係る有利発行該当性について検討を行った。いずれもベイシスの変動が課税結果を大きく左右する事象である。さらに、近時の経済のデジタル化と課税関係(個人所得税・法人所得税・消費税・手続)や、シェアリング・エコノミーが与える所得課税への影響などについても検討を行っている。 非法人組織体(事業体)課税については、ベイシスを念頭に置きつつ、わが国のパススルー課税制度のあり方を検討した。 損失や消費課税などに関し、連結納税における投資簿価修正の今後のあり方、消費課税が抱える現在の問題(国際取引含む)について検討を行ったほか、一般的租税回避否認規定(GAAR)の適用に関し、いわゆるGAAR Panelの比較法的検討を行った。 ブロックチェーンの活用などに関し、UCI(University of California Irvine)ロースクール主催のカンファレンスに参加し、米国をはじめとする諸外国の租税行政でのデータサイエンスをはじめとする先進的なICTの活用事例などについて情報収集を進めると同時に、参加していた法学者やエンジニア、政策当局者と意見交換も行った。
    なお、新型コロナウイルスの感染拡大により不可能となった外国調査については、繰越・再繰越年度に遠隔方式による調査によって代替した。
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  • An analysis of the legal and economical relationship between the taxpayers and the government

    Grant number:15K16922  2015.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Masahiro Kozuka

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    Grant amount:\3250000 ( Direct expense: \2500000 、 Indirect expense:\750000 )

    I have analyzed the cases where different tax treatments are set for identical or similar economic activities using the knowledge of the other fields such as theory of game. And I found that the area where the taxpayers could elect their best choice in effect had been broadened and published the outcome through writing the articles. Furthermore, I built the foundation which allowed us to demonstrate my analysis using the actual data.

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  • Analysis of Corporate Income Tax using theory of game

    Grant number:23653007  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    KOZUKA MASAHIRO

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    Grant amount:\2470000 ( Direct expense: \1900000 、 Indirect expense:\570000 )

    In this research project, I focused on the previous work (Hideki Kanda & Saul Levmore, Taxes, Agency Costs, and the Price of Incorporation, 77 Va. L. Rev. 211 (1991)), which considers the income taxation at business entity level as ideal mechanism and checked that conclusion would sustain if we should take care of the level of tax revenue.
    In the end, I reached the conclusion that it was difficult to consider the corporate tax as ideal from reducing the cost of agency.

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  • Analysis of ideal capital income taxation

    Grant number:21830045  2009 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity Start-up

    KOZUKA Masahiro

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    Grant amount:\2132000 ( Direct expense: \1640000 、 Indirect expense:\492000 )

    We tried to analyze the taxation system for partnerships and corporations in United States to make clear how we should recognize economic resources as capital assets. We found that it would be necessary not to recognize some economic resources as assets to achieve the coherent taxation of capital income.

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  • Study on the changing conceptof asset basis in taxation

    Grant number:20330007  2008 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OKAMURA Tadao, WATANABE Tetsuya, TAKAHASHI Yusuke, KOZUKA Masahiro

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    Grant amount:\18460000 ( Direct expense: \14200000 、 Indirect expense:\4260000 )

    The ability of a person or organized persons to create a future income stream can be recognized as an asset for income tax purposes. Because various economic interests are bound up with such an income stream, Japanese tax law needs provisions to recognize those interests and to calculate their basis. It also needs to provide what is the transfer of those interests and when they are subject to tax. Factual relationships should determine to whom income from such interests is taxable.

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