Question: We know that there is a great reward for observing Sawm (Fast) on six days during Shawwal. A woman broke her Sawm during Ramadaan for six days for a Shar`ee (Islaamically lawful) reason, and she wants to make up for them during Shawwaal. Is it permissible for her to combine the two intentions, that is, the intention of observing compensatory Sawm for the days she missed during Ramadaan and the intention of observing the six-day supererogatory Sawm of Shawwaal? In other words, is it permissible for her to observe Sawm for only six days during Shawwaal with the intention of being compensatory Sawm and at the same time seeking the reward of observing Sawm for the six days of Shawwaal? Is it permissible to combine the intention for the two Sawm like Qiran Hajj (combining Hajj and `Umrah without a break in between)?
Answer: Observing compensatory Sawm for six days during Shawwaal is not counted as the six-day supererogatory Sawm of Shawwaal. This is because one should not begin observing the six-day supererogatory Sawm of Shawwaal unless one has already made up for the days they missed during Ramadaan… read more here.