Why to wait for 1 year to pass on the wealth?
Islam doesn’t impose Zakaat on the wealth which is left over apart from the basic needs, but the Shariah has made Zakaat obligatory on the wealth that has been saved for a year. As it is a sign of the individual being wealthy and affluent. Now this affluence demands that the individual should give a part of his savings for the poor and needy folk of the community who don’t have money to fulfill even basic needs.