What is required of one who broke his fast in his house then had intercourse with his wife while traveling, believing that the atonement is only making up the day?

Evidence from the Quran, Sunnah, and scholarly consensus indicates the permissibility for a traveler to break their fast in Ramadan, with the obligation to make up the missed days. However, a person is not considered a traveler until they have left the boundaries of their country and its populated areas. Therefore, they are not permitted to avail themselves of travel concessions before that.

For one who engages in sexual intercourse with his wife during daylight hours of Ramadan while being a resident, a severe expiation is due: freeing a slave. If he cannot find one, then fasting for two consecutive months. If he is unable to do that, then feeding sixty poor people, along with repentance and making up that day. The woman is like the man if she was willing.

The ignorance that excuses a person is ignorance that the act is forbidden. As for ignorance of the punishment resulting from a forbidden act whose prohibition is known, it is not an excuse.

Therefore, making up the day is obligatory, and expiation is due for the breaking of the fast that occurred before travel, by fasting two consecutive months. If he is unable to do that, then feeding sixty poor people. The same applies to the wife; if she is unable, she should feed sixty poor people.