Sadaqah in Islam refers to voluntary charity given for the sake of Allah, not limited to material wealth but including actions, kindness, and support for others.

Sadaqatul Jariyah is one of the most rewarding acts in Islam, offering ongoing benefits to both the giver and the recipient. It is a form of Sadaqah that continues to bring blessings even after a person has passed away.

Unlike Zakat, Sadaqah is not income / asset based or rule-based giving. Any charity other than the annual Zakat falls under Sadaqah. Therefore, how much Sadaqah to give from salary or your income is a personal choice and depends on your ability and choice.

🏛Zakat al-Mal (commonly called 'Zakat') is one of the five pillars in Islam, an obligation ordained by our Creator. It is due when a Muslims wealth reaches the nisab (threshold) amount. It is paid annually on their Zakat anniversary. Muslims are required to pay 2.5% from their Zakatable wealth. 

🤲Zakat al-Fitr is given by the head of the household for each member of the family, before the Eid al-Fitr prayer. All Muslims must give Zakat al-Fitr regardless of their age or financial status, unless they themselves do not have the means to do so, Hence, they could be eligible to receive Zakat ul-Fitr or Zakat themselves. 

💰Sadaqah is voluntary donations, and there is no limit on how much you can pay or when you pay.

No, this doesn't diminish your rewards; your donation has gone to those in need. Claiming it back on your taxes simply means you can choose to re-donate and continue supporting those in need or use it for your own needs.