Wa alaikum salam, Yes, you must give zakat on that. Designate a date and always give  2.5% on whatever had accumulated in that day every year.

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The one who is unable to fast on an ongoing basis is obliged to feed one poor person for each day that he does not fast, because Allaah says (interpretation of the meaning): “And as for those who can fast with difficulty, (e.g. an old man), they have (a choice either to fast or) to […]

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