LyondellBasell Industries N.V.

9. Income Taxes

For interim tax reporting, we estimate an annual effective tax rate which is applied to the year-to-date ordinary income. Tax effects of significant, unusual, or infrequently occurring items are excluded from the estimated annual effective tax rate calculation and recognized in the interim period in which they occur. Our effective income tax rate fluctuates based on, among other factors, changes in pre-tax income in countries with varying statutory tax rates, changes in valuation allowances, changes in foreign exchange gains or losses, the amount of nontaxable or nondeductible items, changes in unrecognized tax benefits associated with uncertain tax positions and changes in tax laws.

Our effective income tax rate for the second quarter of 2026 was 29.2% compared to 30.8% for the second quarter of 2025. The lower effective income tax rate for the second quarter of 2026 was due to changes in earnings in countries with varying statutory tax rates coupled with an increase in exempt income that decreased the effective income tax rate by 8.5 percentage points and 5.7 percentage points, respectively. These decreases were partially offset by an increase in our effective income tax rate of 14.2 percentage points due to the impact of the divestiture of select European assets and the associated businesses, which is largely nondeductible for tax, recognized discretely in the second quarter of 2026.

Our effective income tax rate for the first six months of 2026 was 24.8% compared to 37.1% for the first six months of 2025. The lower effective income tax rate for the first six months of 2026 was due to changes in earnings in countries with varying statutory tax rates coupled with fluctuations in foreign exchange losses and exempt income that decreased the effective income tax rate by 11.0 percentage points,5.8 percentage points, and 5.3 percentage points, respectively. These decreases were partially offset by an increase in our effective income tax rate of 11.0 percentage points due to the impact of the divestiture of select European assets and the associated businesses, which is largely nondeductible for tax, recognized discretely in the first six months of 2026.