Allah Ta’ala has put the most minimum burden of monetary obligations on Muslims so that paying Zakah becomes convenient for every sahib-un-nisaab Muslim.
Firstly, it is not obligatory to pay Zakah on every asset. Rather only those assets are the subject matter of Zakah that have the potential of growth or increase. These assets may be broadly classified as follows:
1- Trading assets.
2- Cash & Cash Equivalent (like prize bonds, Travelers Checks etc)
3- Gold and silver
4- Livestock (goats, sheep, cows and camels)
5- Agricultural output.