Even if you’re taxed at source, you’ll have to fill your declaration if you earn more than 2k a year in dividends (or other not-already-taxed income) or if you have invested more than 100k (or 200k for a joint declaration of a married couple). I crossed the threshold for dividends in 2019 and 2020 and last year I informed the tax office about this - they send me the tax forms and I filled them (including with DA-1). I haven’t received yet any feedback from them, but when they’ll write back, I’ll let you know how it went.
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