Zakat is one of the Five Pillars of Islam — a 2.5% annual wealth obligation on qualifying assets held above the nisab threshold for one lunar year. Calculating Zakat on modern investment portfolios is complex: each stock has a different proportion of zakatable assets. These articles cover how to calculate Zakat on US stocks, ETFs, mutual funds, 401k plans, gold, and real estate — with step-by-step guidance and tool recommendations.