In general, you don't have to do anything. Each time a dividend is paid on a project, the project manager will declare the withholding made to each investor. In addition, although this withholding will automatically appear in your tax data, Fundeen will provide all investors an annual report of withholdings.
It should be noted that there are exceptions for international investors. In these cases, it would be necessary to analyze each specific case. If you still have any doubts, please contact us on the Investor Support telephone number +34 911 23 82 77.