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Income and expenses - Income taxes - Deferred tax additional information (Details) - EUR (€) € in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Innovation income deduction % | 85.00% |  |  |
Unused tax loss carry-forward, tax credits and other | € 119,042 | € 144,465 | € 91,753 |
Deferred tax assets | 3,523 | 3,971 | 2,797 |
Deferred tax liabilities | 3,202 | 2,660 | 3,725 |
Materialise NV |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax loss carry-forward, tax credits and other | 55,669 | 70,402 | 46,533 |
Tax losses carried forward and Innovation Income Deductions | Materialise USA |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets | 1,200 | 500 |  | € 1,000
Tax losses carried forward and Innovation Income Deductions | Materialise NV |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets | 0 | 1,300 | 100 |
Tax losses carried forward and Innovation Income Deductions | ACTech, Inc. |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets | € 0 | 1,000 | € 0 |
Connection with business combination |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  | € 4,804 |  |

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