Analysis of Adjusted Covered Taxes Under the GloBE Model Rules

Adjusted Covered Taxes and the Minimum Tax Threshold

This piece is the fourth in our series on the OECD/G20 Global Anti-Base Erosion (GloBE) Model Rules. It looks at how a group works out its adjusted covered taxes. That figure sits at the heart of the effective tax rate. The rules are meant to make large multinational groups pay a minimum level of tax in each country where they operate. They also aim to curb base erosion and profit shifting. The figure has to be right before the minimum tax test means anything.

Foundations of Adjusted Covered Taxes

Adjusted covered taxes are the tax side of the effective tax rate (ETR) under the GloBE Rules. You work out the ETR by dividing the tax a group books in a country by the income it books there. The test is meant to keep tax and profit in the same place.

Article 4.1: Adjusted Covered Taxes

Article 4.1 sets out how to adjust the tax reported in the accounts. Some tax is deferred, or brought forward, by the accounting rules or by local law. Those timing effects can distort the tax charge shown for a single entity. Article 4.1 pulls the figure back to the charge the entity really bears.

- Key Adjustments: The main items are depreciation, losses carried forward and the timing of income. Each can shift tax from one year to another. The aim is to base the ETR on the real tax charge, not on the accounting entry alone.

Article 4.2: Definition of Covered Taxes

Article 4.2 defines covered taxes. The term takes in taxes on income at any level of government: federal, state or local. That wide reading is deliberate. It lets the GloBE rules work the same way in tax systems built on different foundations.

- What Is Included: The definition covers tax on profits, dividends, capital gains and income from foreign subsidiaries. The aim is to capture every large tax payment that moves the group's rate, not just tax on trading profit.

Article 4.3: Allocation of Covered Taxes Between Entities

Article 4.3 deals with tax paid by one group entity that belongs to another. Some tax is charged in one country but earned in another. The article sets how to move that tax to the entity that earned the profit. Without it, a country's ETR would show tax it did not generate.

- How the Split Works: The split follows a method that fits the facts of the group. Revenue, assets and payroll are the usual drivers. Whichever drivers a group uses, the result has to follow where the profit was earned.

Article 4.4: Mechanism to Address Temporary Differences

The accounts and the tax return rarely book income and costs in the same year. Those timing gaps are called temporary differences.

- Deferred Tax: The GloBE Rules use deferred tax to bridge the gap. A group's ETR should show the tax burden over time, not the swing of a single year. Deferred tax entries do most of that work.

Article 4.5: The GloBE Loss Election

Earnings move from year to year. Article 4.5 lets a group choose how it treats losses in the GloBE calculation. The choice matters most where profit swings hard across the cycle.

- Using Losses: A loss can be carried forward and set against later profit. The ETR then reflects the full cycle, not the good years alone.

Article 4.6: Post-filing Adjustments and Tax Rate Changes

A tax figure can change after the return is filed. A rate change or a tax audit can do it.

- Post-filing Changes: Article 4.6 brings those later changes back into the GloBE numbers. The ETR stays tied to the tax finally agreed, not to the first estimate.

Conclusion

Adjusted covered taxes do much of the work in the GloBE calculation. Each article from 4.1 to 4.6 answers one question: what counts as tax, whose tax it is, and which year it belongs to. Answer those three and the ETR follows. The next piece in the series covers the effective tax rate itself, and the top-up tax that flows from it.