Meaning
Backstop mechanisms allow jurisdictions to collect top-up tax on low-taxed income that has not been captured by other minimum tax provisions. The undertaxed profits rule serves as a secondary layer of the Pillar Two global minimum tax framework, acting when the primary income inclusion rule is not applied. It ensures that any profit taxed below the fifteen percent minimum is subject to an additional levy somewhere in the corporate structure.
This prevents multinational groups from escaping the minimum tax by headquartering in countries that have not adopted the new rules.
Allocation Key
The amount of tax collected under this rule is distributed among the participating jurisdictions based on a formulaic approach. In the application of the undertaxed profits rule, the tax is allocated according to the relative number of employees and the value of tangible assets in each country. This ensures that the tax revenue goes to locations where the company has a real economic presence.
This method prevents a single country from claiming all the residual tax from a global group.
Secondary Right
This provision only becomes relevant if the jurisdiction of the ultimate parent company does not enforce a qualifying minimum tax. Through the undertaxed profits rule, other countries where the group operates can step in to collect their share of the missing tax. This creates a powerful incentive for all nations to adopt the Pillar Two standards, as they would otherwise lose the tax revenue to other countries.
It closes the remaining gaps in the global tax net.
Effective Rate
Calculations must determine the total amount of top-up tax due for the entire group before the local allocation takes place. Under the undertaxed profits rule, the assessment is made by comparing the taxes paid in each low-tax jurisdiction against the fifteen percent threshold. If the parent company’s home rate is also low, that income is included in the calculation.
The resulting tax is then divided among the subsidiaries’ countries according to the agreed allocation factors.
