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Annual report in Finland 2026: The complete guide to Tilinpäätös and Veroilmoitus for Finnish companies

Every Finnish limited company (osakeyhtiö, Oy) must file an annual report (tilinpäätös) and a corporate income tax return (veroilmoitus) within four months of the end of its financial year. For a company with a standard calendar year, both are due by 30 April. This is not a guideline or a best practice. It is a…