How do I know if a stock is Shariah-compliant before investing in it?

Knowing whether a stock is Shariah-compliant requires two separate layers of analysis applied in sequence: a business activity screen and a financial ratio screen. Both must be passed for a stock to be considered potentially permissible under the approach described below, which draws on AAOIFI Sharia Standard No. 21 on Financial Papers (Shares and Bonds). This is CoinStudy’s methodology-informed guidance and not a personal fatwa. Please consult a qualified Islamic scholar for individual rulings on specific investments.

The first layer is the business activity screen. Before looking at any numbers, you need to understand what the company actually does. A company whose primary business falls in a categorically prohibited category cannot become permissible through clean financial ratios. Prohibited primary businesses include conventional banking and interest-based financial services, alcohol production and distribution, tobacco manufacturing, pork production and processing, gambling and casino operations, and adult content businesses. These are areas of broad scholarly agreement. If the company’s core revenue comes from any of these, the analysis ends there.

For companies in mixed-activity industries, where some minor revenue may come from impermissible sources alongside a primarily permissible business, the AAOIFI Standard No. 21 framework applies a tolerance threshold: income from prohibited sources should remain below 5% of total income. Anything above that threshold means the prohibited activity is no longer incidental.

The second layer is the financial ratio screen. AAOIFI Standard No. 21 as commonly applied describes three primary financial tests, each using market capitalization as the denominator. The first test is total interest-bearing debt divided by market capitalization, which should remain below 30%. The second test is total interest-taking deposits and interest-bearing financial assets divided by market capitalization, also below 30%. The third test is income from prohibited sources divided by total income, below 5%, which overlaps with the business screen above but is applied quantitatively here.

To apply these tests yourself, you need the company’s latest annual or quarterly financial statements. Interest-bearing debt is typically found on the balance sheet under long-term debt, short-term borrowings, and notes payable that carry explicit interest. Interest-bearing financial assets are cash deposits in interest-bearing accounts and investment portfolios in interest-bearing instruments, found in the cash and investments sections of the balance sheet. Market capitalization is the current share price multiplied by total shares outstanding, available on any financial data platform. Revenue from prohibited sources, if any, is disclosed in the revenue breakdown or segment reporting sections of the annual report.

Once you have these numbers, calculate each ratio and compare to the thresholds above. If all three pass and the business activity screen is satisfied, the stock is a candidate for investment under this framework, subject to the purification obligation.

Purification is a separate obligation that applies even after passing all screens. Almost no large corporation operates with zero interest income or zero interest-bearing financial activity. Islamic scholars have developed the purification concept to address this: you calculate your proportional share of the company’s impermissible income for the period you held the shares and donate that amount to charity. This is not zakat; it is a separate cleansing of any incidental impermissible income that passed through your investment. The specific calculation method depends on the scholarly approach you adopt, and CoinStudy recommends confirming this with a qualified Islamic scholar before applying any formula.

CoinStudy’s upcoming Halal Stock Standard (HSS) will bring this screening framework to Muslim investors in a structured and accessible format, with analysis, ratio data, and a purification calculator built in. The HSS methodology will be published in full before launch and reviewed by CoinStudy’s Shariah Board. In the meantime, Muslim investors can apply the framework described above manually using any major financial data platform to access the required figures.