The World Federation One Stop Fiqh

Ruling 1679

If a person intentionally does not keep the fasts of the month of Ramadan, he must make them up; and for each missed fast he must fast for two months, or give food to sixty poor people, or free one slave. In the event that he does not make them up until the next month of Ramadan, then based on obligatory precaution, he must also give one mudd of food as kaffārah.