Voluntarily giving more than a saa’ for zakaat al-fitr

Dear Brothers & Sisters,
As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
Is it permissible to give more than a saa’ for zakaat al-fitr, and let the extra amount be sadaqah (charity)?.
(There may be some grammatical and spelling errors in the above statement. The forum does not change anything from questions, comments and statements received from our readers for circulation in confidentiality.)
Check below answers in case you are looking for other related questions:
Can the imam of the mosque collect zakaat al-fitr, and where should it be distributed?
They gave him zakaat al-fitr but he delayed giving it until after the day of Eid because he could not find any poor people

Answer:
Praise be to Allaah.

Yes, there is nothing wrong with that; the saa’ will be the obligatory zakaat al-fitr and anything more than that will be voluntary, and the giver will be rewarded for it. 

Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) was asked about a person who owed zakaat al-fitr and knew that it was a saa’, but he gave more than that, and said that it was naafil. Is that makrooh? 

He replied: 

Praise be to Allaah. Yes, it is permissible and is not makrooh according to most scholars, such as al-Shaafa’i, Ahmad and others. It was only narrated from Maalik that it is makrooh. 

As for giving less than what is required, that is not permissible, according to scholarly consensus. End quote. 

Majmoo’ Fataawa Ibn Taymiyah (25/70).

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.
Your brother and well wisher in Islam

Related Answers:
A son is well-off but his father still wants to give zakaat al-fitr on his behalf
He cannot find anyone who is entitled to zakaat al-fitr
Is it permissible to distribute zakaah on a monthly basis? Can it be converted into food?
Can the imam of the mosque collect zakaat al-fitr, and where should it be distributed?
They gave him zakaat al-fitr but he delayed giving it until after the day of Eid because he could not find any poor people

Recommended answers for you:
Ruling on singling out Friday for fasting
The difference between maniy, madhiy and moisture
What is the best way to treat anxiety?
Our attitude towards Yazeed ibn Mu’aawiyah
Does nail polish invalidate wudoo’ and do the prayers have to be repeated?