Territorial Tax System

A territorial tax system limits a country’s tax authority to income arising within its borders, leaving foreign-source income untaxed by the home country. This contrasts with worldwide taxation, which taxes a resident on all income regardless of source. The choice between these two approaches has profound effects on incentives for outbound investment, profit repatriation, and international business structuring.

The fundamental distinction

A territorial tax system draws a line at the border: the country taxes income that arises within its territory (from local businesses, rental real estate, sales) but does not tax its residents on foreign-source income. A UK resident earning a salary in France, interest on US bank accounts, or profits from an overseas business owes no tax to the UK on those earnings.

A worldwide (or residence-based) tax system looks at the residence of the taxpayer, not the source of the income. A US resident owes US tax on all income — whether earned in the US, the UK, Australia, or anywhere else. The home country taxes its residents on worldwide income.

The US operated a worldwide system for its entire history until 2017, when the Tax Cuts and Jobs Act introduced a partial shift toward territoriality. Most other developed nations — the UK, France, Germany, Canada, Australia — operate territorial systems, though with carve-outs and base-erosion protections.

Why countries choose one or the other

Territorial systems are attractive because they encourage capital to flow outward and foreign investment to grow. If a US company invests in a manufacturing plant in Vietnam and earns profits there, the company faces Vietnamese tax on those profits but no additional US tax. This makes the investment more attractive, all else equal. Residents are incentivised to pursue opportunities abroad without facing a second tax layer at home.

From a compliance and administration standpoint, territorial systems are simpler. The taxing authority only needs to track domestic-source income; it has no need to monitor worldwide assets and income of its residents. A UK tax authority does not need to verify whether a London resident earned interest in Bermuda or capital gains in Singapore.

Worldwide systems are attractive for revenue and fairness reasons. A country that allows its wealthy residents to avoid tax on foreign income loses revenue. From a progressivity standpoint, worldwide taxation ensures that a high-income individual cannot shift tax burden downward by parking assets abroad. If a billionaire is a US resident, the US taxes her worldwide income and can progressively tax at high rates.

Worldwide systems also encourage capital to remain in the home country. If you are a US resident and US tax on foreign income is high, you have less incentive to move money abroad; it is more efficient (after tax) to invest domestically.

Finally, worldwide systems align better with residence-based fiscal citizenship: the idea that you owe a fiscal duty to the country you reside in, regardless of where you earn.

The repatriation issue

A critical distinction between the two systems is the treatment of bringing profits home.

In a territorial system, a US multinational can earn $100 in profits abroad, pay local tax (say, 20%), and repatriate the remaining $80 to the US with no US tax. The company has no incentive to defer repatriation or lock money overseas to avoid US taxation — there is no US tax due on repatriation.

In a worldwide system (as the US had pre-2017), the multinational would owe US tax on the $100, less a credit for the $20 of foreign tax paid. If the US rate is 35% and the foreign rate is 20%, the US would collect an additional 15% on the foreign profits when repatriated. This creates a “repatriation tax” and incentivises companies to keep earnings offshore indefinitely, never bringing them home (a practice called “earning stripping” or indefinite deferral).

The US Treasury has long complained that worldwide taxation, combined with deferral rights, creates a situation where multinationals park vast sums — once estimated at $2+ trillion — in low-tax foreign jurisdictions and never repatriate. They argue for territoriality (or for elimination of deferral) to encourage repatriation and domestic investment.

Others counter that territorial systems shift tax burden from corporations to workers and domestic consumers, and that a properly designed worldwide system (without deferral) would not create lock-out effects.

The 2017 US shift and the Territory-to-Worldwide Hybrid

In 2017, the US Tax Cuts and Jobs Act moved the US tax system partly toward territoriality by introducing:

• A one-time tax (at reduced rates) on accumulated foreign earnings, encouraging repatriation.
• A permanent shift toward taxing US corporations only on US-source income (domestic profits), with foreign-source income largely untaxed at the corporate level.
• A global minimum tax on intangible foreign income (the “Global Intangible Low-Taxed Income” or GILTI) designed to prevent companies from parking intellectual property in zero-tax jurisdictions.

The result is a hybrid: the US is not fully territorial (GILTI still imposes tax on some foreign income), but it is much closer to territorial than before. The intent was to encourage US multinationals to bring foreign profits home and invest in the US.

The effect on repatriation has been significant: major companies announced large repatriations in 2017–2018. Whether it increased domestic investment (as promised) or was used primarily for share buybacks and dividends remains debated.

Territorial systems and profit shifting

Territorial systems create a different profit-shifting incentive than worldwide systems. Instead of trying to defer repatriation of foreign income (which does not trigger home-country tax anyway), companies have incentive to shift profits into low-tax territories using transfer pricing and other techniques.

A UK company operating in the UK and the Caymans can legally book income in the Caymans (via transfer pricing or intellectual property licensing) to avoid UK tax, then never repatriate it — the company owes no UK tax on Caymans income whether it repatriates or not. This is still profit-shifting, but the mechanism and timing are different.

Accordingly, territorial countries have adopted aggressive anti-base-erosion rules, including transfer pricing rules, earnings-stripping rules, and thin-capitalisation rules, to prevent excessive profit-shifting. The OECD’s Base Erosion and Profit Shifting (BEPS) initiative, largely driven by territorial countries that wanted to protect their tax bases, imposed rules on all countries to make profit-shifting harder.

The 2021 OECD global minimum tax agreement

In 2021, the OECD agreed on a global minimum corporate tax of 15%, partly driven by territorial countries’ concerns that low-tax territories were siphoning off taxable profits. The agreement is designed to ensure that multinational profits face at least 15% tax somewhere, reducing incentives for profit-shifting regardless of whether a country uses territorial or worldwide taxation.

This represents a move toward a hybrid of both systems: countries continue to use their own territorial or worldwide rules for domestic taxation, but a global minimum tax acts as a backstop to reduce the most aggressive profit-shifting.

Developing countries and tax sovereignty

Developing countries, which typically cannot enforce sophisticated worldwide taxation systems and which attract foreign direct investment, tend to prefer territorial systems. A developing nation benefits from foreign investment in local subsidiaries and wants tax revenue from those operations. Territorial tax rights are allocated by source, so the country hosting a foreign subsidiary gets to tax its profits.

However, developing countries also face the risk that multinationals use transfer pricing and profit-shifting to move profits out of the developing country’s territory into low-tax havens, depriving the developing country of tax revenue. This is why developing countries have been strong supporters of BEPS and anti-base-erosion rules.

See also