v3.26.1
Income and deferred tax - Reconciliation of effective tax rates (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Tax      
Income (loss) before taxes € (86,766) € (193,977) € (80,593)
Expected German income tax rate 32.28% 32.28% 32.28%
Expected income tax benefit (expense) € 28,008 € 62,616 € 26,015
Non-deductible expenses (8,202) (33,773) (8,274)
R&D tax credits 8,297 8,667 8,558
Tax free income 2,322 13,106 7,968
Permanent differences from GILTI (649) (778) (156)
Tax effects from investments accounted for using the equity method 2,494 (683) (8,373)
Deviation tax rates to expected tax rate 6,137 (992) (1,343)
Change in tax rates (2,254)   (251)
Change in recognition of deferred tax assets (52,791) (49,359) (25,568)
Current Taxes related to prior years 2,784 328 (2,666)
Deferred Taxes related to prior years (2,455) (1,736) 556
Other (442) 502 213
Tax income (expense) recognized in the income statement € (16,751) € (2,102) € (3,320)
Effective income tax rate (19.31%) (1.08%) (4.12%)
Solidarity surcharge rate 15.825%    
Trade tax rate 16.45%    
Reduction of current tax expense due to utilization of previously unrecognized tax losses € 8,337   € 1,329