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Top-up Tax Estimator

Get a quick estimate of the potential top-up tax liability for a jurisdiction under the GloBE rules. Enter your figures below to see the effective tax rate, substance-based income exclusion, excess profit, and estimated top-up tax.

The calendar year in which the fiscal year begins. Determines the transitional SBIE carve-out rates that apply.
The net GloBE income for all constituent entities in this jurisdiction after required adjustments.
Total adjusted covered taxes for the jurisdiction, including deferred tax adjustments.
Total eligible employee compensation costs for constituent entities in this jurisdiction.
Average carrying value of eligible tangible assets across the fiscal year.

How the Estimate Works

This tool calculates a simplified estimate of the top-up tax under the GloBE rules using the following steps:

  1. Effective Tax Rate (ETR): Adjusted Covered Taxes divided by Net GloBE Income.
  2. Top-up Tax Percentage: The difference between the 15% minimum rate and the jurisdictional ETR (floored at zero).
  3. Substance-Based Income Exclusion (SBIE): A percentage of eligible payroll costs plus a percentage of the carrying value of eligible tangible assets. The Article 9.2 transitional schedule starts at 10.0%/8.0% for FY 2023 and steps down each year (9.8%/7.8% in 2024, 9.6%/7.6% in 2025, 9.4%/7.4% in 2026, 9.2%/7.2% in 2027, 9.0%/7.0% in 2028, 8.2%/6.6% in 2029, 7.4%/6.2% in 2030, 6.6%/5.8% in 2031, 5.8%/5.4% in 2032), reaching the permanent 5.0%/5.0% rate from FY 2033 onwards. Select the applicable fiscal year above to apply the correct rates.
  4. Excess Profit: Net GloBE Income minus the SBIE amount (floored at zero).
  5. Estimated Top-up Tax: Top-up Tax Percentage multiplied by the Excess Profit.

Disclaimer: This calculator provides an indicative estimate only. It uses simplified assumptions and does not account for all adjustments, elections, or allocations required under the full GloBE computation. The SBIE transitional rates shown are based on Article 9.2 of the OECD GloBE Model Rules and decrease annually from FY 2023 through FY 2032 before settling at the permanent 5%/5% rates from FY 2033 onwards. This tool applies the rates for the selected fiscal year start. Results should not be relied upon for compliance or financial reporting purposes. For accurate calculations, book a demo of the Pillar Fifteen platform.

Need precise top-up tax calculations?

The Pillar Fifteen platform runs full GloBE ETR and top-up tax computations across all your jurisdictions, with every figure linked to its source data and rule reference.

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