The ruling on one who is negligent in paying zakat al-fitr until its time has passed

This message is from Riyadh and was sent by the questioner, the brother (J. A. H). He says: Last year, I did not pay the zakat of the person (zakat al-fitr) at the end of Ramadan, neither for myself nor for my family, without any excuse other than laziness and negligence. I have heard some scholars say: What is the use of fasting without the zakat of the person? I ask for your information on this, and may Allah reward you with good.
Answer: Zakat al-fitr is one of the obligatory duties. It is established from the Messenger of Allah (peace and blessings be upon him) that he made zakat al-fitr obligatory upon the male and the female, the free person and the slave, and the young and the old among the Muslims. He ordered that it be paid before the people go out to prayer. The scholars of Islam have agreed upon its obligation and that it is obligatory upon all Muslims, males and females, young and old, free persons and slaves. Zakat al-fitr is due upon all of them: one sa' (a dry measure of about 3 kg) for each person, which is four handfuls with two moderate, full hands. This is the Prophetic sa', four handfuls with two moderate, full hands; this is the Prophetic sa'.
So, it is obligatory upon every Muslim to pay one sa' for himself, one sa' for his wife, and one sa' for his children, one sa' for each one of them, specifically those children for whom he is responsible and whom he provides for. He must also pay one sa' for the servants he has.
The point is that one sa' is due for himself and for each person under his care. It is obligatory to pay this before the prayer, as the Prophet (peace and blessings be upon him) ordered, meaning before the 'Id prayer. This is what is obligatory. If one is negligent or forgets and does not pay it, it becomes obligatory for him to pay it afterwards as a make-up (qada'), along with repentance if he did so intentionally. You, O questioner, must repent to Allah and you must pay zakat al-fitr when Allah guides you. You pay it to the poor and the needy, one sa' for each person under your care. You must also repent to Allah from this delay and laziness. Whoever repents, Allah accepts his repentance. The substance of repentance is regret for the past sin, a sincere resolve not to return to the sin, along with abandoning it, leaving it, and guarding against it.
So, you must repent to Allah and regret the negligence that has passed from you. You must pay it to those who are entitled to it, with a sincere resolve not to return to such a thing. This is what is obligatory. Yes.
The presenter: But regarding fasting, for example, the acceptance of the fasting...
The Shaykh: As for fasting, it has no connection to that. Fasting... it is known that it is part of the completion of fasting, as it came in the authentic hadith: But leaving it does not invalidate the fasting. The fasting is valid, sufficient, and effective, but it is deficient; there is a deficiency in it due to the lack of this zakat. So the zakat compensates for it; it compensates for the deficiency, just as the prostrations for forgetfulness (sujud al-sahw) do in prayer. It is a compensator and a completer. If it is delayed, or if its owner is lazy, or if he does not pay it intentionally, then this is a sin, and his owner must repent. Repentance compensates for the deficiency. Repentance compensates for the deficiency. And along with repentance, he must perform the payment, paying the zakat as a make-up. Yes.