535
Question
Is charging a late fee on a tuition or registration as charging interest?
Could you site sources, please.
Answer
A one-time fine for paying after a certain date is permitted (Shulchan Aruch Yoreh Deah 177 14-16; Shach Yoreh Deah 177 33; see Shu"t Shevet HaLevi VIII 193). If the fine is per month or per week this is more problematic and the institution should use a "heter iska".

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