4. Is there a ban on corporate donations to candidates?

《政治獻金法》第七條
Article 7, Political Donations Act (https://law.moj.gov.tw/ENG/LawClass/LawAll.aspx?pcode=D0020049)

《政治獻金法》第 7 條
得捐贈政治獻金者，以下列各款以外之個人、政黨、人民團體及營利事業為限：
一、公營事業或政府持有資本達百分之二十之民營企業。
二、與政府機關（構）有巨額採購或重大公共建設投資契約，且在履約期間之廠商。
三、有累積虧損尚未依規定彌補之營利事業。
四、宗教團體。
五、其他政黨或同一種選舉擬參選人。但依法共同推薦候選人政黨，對於其所推薦同一組候選人之捐贈，不在此限。
六、未具有選舉權之人。
七、外國人民、法人、團體或其他機構，或主要成員為外國人民、法人、團體或其他機構之法人、團體或其他機構。
八、大陸地區人民、法人、團體或其他機構，或主要成員為大陸地區人民、法人、團體或其他機構之法人、團體或其他機構。
九、香港、澳門居民、法人、團體或其他機構，或主要成員為香港、澳門居民、法人、團體或其他機構之法人、團體或其他機構。
十、政黨經營或投資之事業。
十一、與政黨經營或投資之事業有巨額採購契約，且在履約期間之廠商。

Article 7, Political Donations Act
Those who may contribute to political donations are limited to individuals, political parties, civil associations and profit-seeking businesses other than following objects:
1. Public enterprises or the civil enterprises in which the government holds not less than 20% of the capital.
2. Manufacturers that have signed government procurement contract of a large amount or an investment contract of important public construction and are performing the contract.
3. Profit-seeking businesses in accumulative deficit that have not been made up in accordance with relevant provisions.
4. Religious associations.
5. Other political parties or other persons planning to participate in the campaign for the same kind of election. However, this shall not apply to the donations contributed by the parties jointly recommending candidates according to law to the candidates of the same group recommended by them.
6. Persons not having the right of suffrage.
7. Foreign citizens, juridical persons, associations or other institutions; or the juridical persons, associations or other institutions mainly composed of the members of foreign people, juridical persons, associations or other institutions.
8. Citizens, juridical persons, associations or other institutions in the People’s Republic of China, or the juridical persons, associations or other institutions mainly composed of the members of the citizens, juridical persons, associations or other institutions of the PRC.
9. Residents, juridical persons, associations or other institutions in Hong Kong and Macao, or the juridical persons, associations or other institutions mainly composed of the members of residents, juridical persons, associations or other institutions in Hong Kong or Macao.
10. Businesses operated or invested by political parties.
11. Manufacturers that have signed a procurement contract in huge amount with the business operated or invested by the political parties, and are currently performing the contract.