Which of the following is subject to donor's tax?

The correct answer is that the remission of debt where the debtor did not render services in favor of the creditor is subject to donor's tax because it constitutes a transfer of wealth that effectively enriches the creditor without receiving a corresponding benefit. Donor’s tax applies to donations or gifts that confer a benefit to another party, making the transfer taxable under the law.

In the case of donations, the Philippines imposes donor's tax on gifts made inter vivos (between living persons) and certain types of financial benefits. When a creditor forgives a debt, it can be seen as a gift to the debtor since the debtor receives a financial benefit without being required to repay the obligation, thus transferring wealth from the creditor to the debtor.

The other options are considered non-taxable events in the context of donor’s tax. Donations made directly to organizations like Iglesia Ni Cristo or the International Rice Research Institute may be eligible for exemptions or deductions depending on the laws governing charitable contributions. Similarly, cash contributions to political candidates could be regulated under different legal frameworks, often not subject to donor’s tax but rather governed by election laws and related statutes. Hence, those instances would not trigger donor's tax obligations.