A voluntary fast is not already owed as Ramadan, a missed obligatory fast, an expiation, or a vow. It is selected for extra devotion.
For example, a Monday fast undertaken as a voluntary fast was not originally due as a debt. Once commenced, however, the Hanafi rule requires make-up if it is invalidated.
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Kitab al-Sawm: Interrupted Voluntary Worship, Puberty and Conversion
A voluntary fast is not already owed as Ramadan, a missed obligatory fast, an expiation, or a vow. It is selected for extra devotion.
For example, a Monday fast undertaken as a voluntary fast was not originally due as a debt. Once commenced, however, the Hanafi rule requires make-up if it is invalidated.