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If the capital gain is less than €500 and the interval between purchase and sale is more than 6 months, you do not need to declare the capital gain.

Otherwise, you have to declare the capital gain. In the "Tax situation" form tick "I hold shares, bonds or other forms of participation in a company" and save. The form "Investments in securities" will appear. On this form you can indicate your capital gain in the "Speculative profit" field.
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