He should make up what he owes first, then fast on behalf of the deceased

She used not to fast during Ramadan when she first reached puberty; should she make them up now that she has grown up?

Fasting with the intention of both making up a missed fast and observing a voluntary fast

Paying Fidyah for Delaying Making up Missed Fasts Before Making Them Up

He died owing two days of Ramadan because he was sick; what should his children do?

Her period was longer than usual on several occasions. What should she do with regard to fasting?

Making up fasts on behalf of one who died after not fasting in Ramadaan due to sickness

Is it obligatory to feed sixty poor persons in one go? Can he feed his family with what he offers as expiation (kafaarah)?

He wants to delay making up Ramadan fasts until winter because the days are shorter

There is nothing wrong with making up Ramadan by fasting days separately