What Makes a Stock Halal? The Complete Guide to Shariah Screening
Understand exactly how stocks are screened for Shariah compliance using AAOIFI Standard No. 21. Learn the debt ratio thresholds, haram revenue limits, and sector blacklists that determine whether a stock is halal.
Why Shariah Screening Matters
For Muslim investors, investing is not merely a financial decision — it is an act of worship when done within the bounds set by Allah. This means ensuring that the companies we own shares in operate in a manner consistent with Islamic principles.
Stock screening filters out companies involved in prohibited activities and those with financial structures that violate Islamic law, primarily the prohibition of riba (interest).
The Two Layers of Screening
1. Business Activity Screening (Sector Filter)
The first step is simple: does the company derive revenue from prohibited activities? The following industries are automatically non-halal:
- Conventional banking and financial services — interest-based lending is the core of their business model
- Insurance — conventional insurance involves gharar (uncertainty) and riba
- Alcohol production and distribution
- Gambling and gaming operators
- Tobacco
- Pork products
- Adult entertainment
- Conventional weapons — subject to scholarly disagreement; some permit defensive industries
2. Financial Ratio Screening
For companies that pass the sector filter, we then examine their financial ratios against AAOIFI Standard No. 21 thresholds:
Debt-to-Assets Ratio (max 33%)
Total interest-bearing debt must not exceed 33% of total assets. This prevents investing in companies that are substantially funded through riba-based borrowing.
Interest-Bearing Liabilities (max 33%)
Interest-bearing liabilities (bonds, loans) must be less than one-third of total assets.
Haram Revenue (max 5%)
Revenue from non-permissible sources must not exceed 5% of total revenue. If a technology company, for example, earns 2% of its revenue from an alcohol advertising contract, it may still pass — but purification of that portion of dividends is required.
What is the AAOIFI Standard?
AAOIFI (Accounting and Auditing Organisation for Islamic Financial Institutions) is the leading international body for Islamic finance standards. Standard No. 21, published in 1999 and updated since, provides the most widely accepted framework for equity screening.
The 33% debt threshold is not arbitrary — it draws from the hadith of the Prophet ﷺ about the maximum third (thuluth), and has been adopted by the Dow Jones Islamic Market Index, MSCI Islamic, and most Shariah-compliant fund managers globally.
The Doubtful Zone
HalalTrends uses a three-tier classification:
- HALAL — passes all AAOIFI criteria comfortably
- DOUBTFUL — borderline ratios (debt 25-33%, haram revenue 3-5%). The stock may be permissible, but prudent Muslim investors may choose to avoid or purify returns.
- NON-HALAL — fails one or more hard criteria
Purification of Returns
For stocks in the DOUBTFUL category — or halal stocks that earn a small percentage from haram sources — scholars recommend purifying returns. This means calculating the haram revenue percentage of dividends received and donating that amount to charity. HalalTrends will help you calculate this.
A Living Assessment
Shariah compliance is not static. A company's debt ratios change every quarter as they issue new bonds or repay loans. Revenue mix shifts as business lines grow or shrink. HalalTrends rescreens all stocks quarterly to ensure our data reflects current fundamentals.
Always check the screened date on any stock's analysis page. If the last screening was more than three months ago, treat the rating with appropriate caution until the next refresh.