If one intends to fast one day (optional fast) but breaks it, do they have to make up for it?
The Shafi and Hanbali position is that it is not obligatory to make up for a broken optional fast.
The Maliki and Hanafi position is that it is obligatory to make up for it.
In either case its a recommended deed to make up for it.
Islamic Jurispudence according to the four schools
Hidayah (Far right, poor scan quality, but legible)