Is Zakat obligatory for someone who dedicates 25% of their income to charity, and is this act praiseworthy or blameworthy?

Zakat is obligatory on saved money if it reaches the nisab and a full year has passed, even if its owner has committed himself to donating 25% of his income to charity.

If this commitment is due to a vow, then it is obligatory to fulfill it. If it is a promise without a vow, then it is not legally obligatory, but what has been given can be counted as part of advanced zakat and deducted from the obligatory zakat when the year is complete.

Dedicating a portion of one's income to charity is a commendable act that is rewarded.