بسم الله الرحمن الرحيم
(Fatwa: 535/535/M=05/1435)
Fast shall break if one has intercourse in the state of fast. If it is done in nafl fast then there is no kaffarah, only the qadha of one fast is enough.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
