This paper provides a structured overview of core concepts in international income taxation. It defines business income and traces how the OECD model treaty governs its taxation across contracting states. It examines double taxation and the role of bilateral and multilateral tax treaties in reducing barriers to international trade. The paper also explores how courts and jurisdictions — particularly the United States and the United Kingdom — determine the source of income, the function of tax credits, and the permanent establishment test. Finally, it distinguishes between service income and employment income, and compares defined-benefit and defined-contribution pension plans. The analysis draws on comparative tax scholarship by Ault, Arnold, Gustafson, Pugh, and Schäfer.
Business income refers to any income ordinarily realized through the execution or transaction of a business activity. This indicates that business income is earned income viewed from the perspective of business transactions or activities. For business income to fall within a taxation system, it must be classified as ordinary income. Business income consists of business expenses, business losses, and business profits — it is the difference between revenues and expenses arising from business transactions. Accordingly, business income can be positive or negative within a given financial year, depending on the relative size of expenses and revenues. Business income is received from the transactions or sales of products or services within a defined market.
The OECD model tax treaty establishes a clear framework for the treatment of business income. It stipulates that the income of an enterprise of a contracting state shall be taxed only in that state, unless the enterprise carries on business activities in the other contracting state through a permanent establishment situated therein. In determining the amount of tax, the relevant authority shall allow a deduction in relation to the financial resources attributable to the permanent establishment in the contracting states. No business income shall be attributed to a permanent establishment merely because that establishment purchases goods or services for the business entity. The determination of business income shall be made consistently from year to year, except for good, sufficient, and compelling reasons to depart from the method previously used (Gustafson & Pugh, 1993).
In international business transactions, business income may become subject to taxation by more than one jurisdiction — a situation known as double or multiple international taxation. Countries across the globe seek to minimize this problem in order to promote effective and efficient international trade. They do so by concluding valuable treaties, such as multilateral and bilateral agreements, with the aim of reducing these barriers to international commerce. Such treaties specify how business income should be taxed between or among contracting states, thereby promoting international trade through the minimization of barriers and the expansion of transaction volumes. Bilateral and multilateral treaties also help reduce the overall level of taxation on business income across contracting states, thereby lessening the overall tax burden on cross-border enterprises.
In the determination of the "source of income," courts are guided by several factors. One essential factor is the location of the item of income (Gustafson & Pugh, 1993). This consideration establishes where a particular item of income falls within the taxation system, and is important for developing tax laws that appropriately levy taxes according to the type of income involved. Another key factor is the geographic area or region associated with the income, including the location of the permanent establishment of the products or merchandise of the entity in question. This is also relevant to the determination of taxable amounts and applicable rates.
The United States determines the source of income on different grounds depending on the item of income in question. For salaries, wages, and related compensation, the U.S. applies the location where the services are performed. For business income, personal services, and sales of inventory (whether purchased or produced), three factors apply: allocation, selling area, and performance location. For interest income, the residence of the payer is the governing criterion. For dividends, rents, royalties, natural resources, and patents, the U.S. considers the location of the item, the nationality of the corporation, and the location where the item is used or exploited. For sales of real property, the location of the property governs; for sales of personal property, the seller's tax home is the determining factor (Schäfer, 2006).
In the United Kingdom, several factors guide the determination of income source for taxation purposes (Schäfer, 2006). One essential factor is the location of the item of income, with reference to the geographical location of the relevant permanent establishment. Another factor is the residence of the taxpayer, which is essential for determining the taxable amount and rate applicable under the taxation system. The United Kingdom also considers the use or application of the income when evaluating its source, and places weight on the performance location as an additional criterion.
Tax credit refers to the amount deducted from the total tax owed by a taxpayer to the state or nation (Ault & Arnold, 2010). Within the context of various jurisdictions, tax credits are granted in relation to various tax categories, including property tax, income tax, and VAT. The implementation of tax credits benefits many taxpayers in important ways. When granted as a deduction from the total tax owed, individuals subject to multiple tax jurisdictions experience a meaningful reduction in their overall tax burden. When granted as a subsidy, these individuals pay minimal taxes, which is essential for reducing the burden on taxpayers operating under the influence of numerous jurisdictions.
Services income focuses on the rewards paid to an individual, group of individuals, or company in recognition of the skills and services they provide to the public and private sectors of the economy (Ault & Arnold, 2010). For an individual or entity to earn service income, that income must arise from the labor or skills of the individual or entity within the defined economy. An example of service income is compensation for manual labor, such as bricklaying — the financial resources received from this activity constitute services income. Employment income, by contrast, is the amount an individual accumulates on a monthly basis or in accordance with the terms of a contract while providing skills to corporations or the public and private sectors (Ault & Arnold, 2010). Examples of employment income include wages, salaries, and fees.
"Tax credits and reduction of taxpayer burden"
"Differences and tests for service vs. employment income"
"Defined-benefit and defined-contribution pension plans"
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