Question: Whoever breaks his fast deliberately, do voluntary fasts benefit him since there is no evidence for making up the fast for the one who breaks it deliberately?
Answer: “No doubt it will benefit him, like the one who wasted many of the obligatory prayers. It will benefit him to replace what he missed with voluntary prayers. Likewise the one who broke a fast in Ramadan or broke the fast deliberately, then there is no way to make it up. It is a severe sin until he repents to Allah, the Exalted with a sincere repentance. He replaces what he missed with good deeds due to him breaking the fast. He increases in voluntary [fasts] until he makes up something of what he missed. Yes”.
[Silsilatul-Huda wan-Nur no. 19]
Shaikh al-Albani (may Allah have mercy upon him) also said:”The author (of Fiqhus-Sunnah) did not present the issue about the making up Ramadan for one who broke his fast deliberately: is it Legislated for him to make it up or not? What is apparent is the second opinion and it is what Shaikhul Islam Ibn Taymiyyah chose as he said in al-Ikhtiyaaraat (pg. 65): “There is no making up for the one who deliberately leaves off a fast or prayer and it is not valid from him. What is reported from the Prophet (ﷺ) that he ordered the one who had intimate relations in Ramadan to make up the fast, then it is weak due to Bukhari and Muslim turning away from them”. It is also the opinion of Ibn Hazm and he reported it from Abu Bakr as-Sideeq, Umar bin al-Khattab, Ali bin Abi Talib, Ibn Masud, and Abu Hurairah (may Allah be pleased with them). Return to al-Muhalla (6/180-185)” [Tamam ul-Minnah (pg. 425)]
Faisal bin Abdul Qaadir bin Hassan