I am a few years old in the madheheb of Imam Jaffer. How do I pay khums, when and to who. Please let me have all the conditions

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Khums is on your saving, please fix one date and it is wajib to pay at the end of the year therefore you may select any date as mentioned on saving whatever left after your expenses and it is wajib on unused items for details please see the tauzeeh UK Masayel or contact local scholar

I am a few years old in the madheheb of Imam Jaffer. How do I pay khums, when and to who. Please let me have all the conditions

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https://www.sistani.org/english/book/48/2285/