Q: I would like to ask if a person uses charity money for their personal use that also includes sadaqa money with the intention to pay back /reimburse. Are they liable to a kufara and what would it be? Is it sin to use the money even though the intention was to pay back?
A: Kaffaarah is not required. However, it is a great sin that you have used charity money for your own needs. You should inform the donors that this is what you have done and ask them for forgiveness as well.
And Allah Ta’ala (الله تعالى) knows best.