AAOIFI Shari'a screening · Reviewed October 8, 2026
Why a halal verdict does not flip the day a ratio crosses the line
Every AAOIFI ratio divides by market capitalization, so a two percent price move can push a company over or under the 30% debt line. HalalScreener publishes a stricter verdict at once and holds a more lenient one until the ratio clears the line by 1.5 points, the same idea behind the buffers in the S&P Shariah methodology.
Because the ratio that crossed the line is divided by market capitalization, and market capitalization moves every trading day. A verdict that reversed on every two percent price move would be noise, not information. HalalScreener therefore publishes a stricter verdict immediately and lets a more lenient one through only once the ratio has cleared the limit by 1.5 points of market cap. Index providers use buffers for the same reason.
What actually moves. AAOIFI Shari'a Standard No. 21 tests interest-bearing debt and interest-bearing deposits against 30% of market capitalization. The numerator comes from a quarterly filing and changes four times a year. The denominator is the share price times the share count, and it changes every trading day. A company that borrowed nothing new can cross the 30% line on a bad week and cross back the next, with no change in its business.
What we saw on our own log. In September 2026 our change log showed several large companies flipping between Halal, Doubtful and Not Halal more than once inside a month, on debt ratios hovering at the limit. Each reversal emailed every investor watching that stock. None of the companies had changed; only the market cap in the denominator had.
The rule we apply. Toward a stricter status the change publishes at once: the moment a ratio is over its limit the page says so, and no lenient label is ever kept on a ratio that is over the line. Toward a more lenient status the ratio must clear the boundary by a margin of 1.5 points of market cap. A stock that failed a hair over 30% stays Not Halal until its debt ratio is under 28.5%; a stock that became Doubtful at the 25% line stays Doubtful until it is under 23.5%. The 5% non-permissible-income test uses the same margin scaled to its limit. A verdict that rests on the company's business activity is never softened by this rule, and a company or fund marked under review is not a ruling and is never held.
A second pair of eyes on anything that gets more lenient. When a re-screen of the same filing would make a published ruling more lenient, the engine holds it for a human second look before it goes live. A stricter ruling never waits.
What the index providers do. The S&P Shariah Indices methodology carries a buffer of its own: a company that was compliant at the previous review and now exceeds the leverage limit stays compliant while the ratio is within two percentage points of the maximum, and is removed only after three consecutive reviews over the line; a non-compliant company coming back under the limit waits the same way. The Dow Jones Islamic Market and S&P Shariah indices also divide by a 24-month or 36-month average market capitalization, which smooths the denominator. HalalScreener's rule differs in one deliberate way: the strict direction is never delayed, so you are told the day a holding is over a limit.
What it means for you. The verdict on a stock page is the ruling as it stands, and the compliance history underneath it shows every change with its date and direction. Pro members get Early Warning, which names the holdings that sit close to a line and the price that would tip them, so a flip is rarely a surprise. Purification is unaffected: it follows the company's non-permissible-income share from its filings, not the verdict label.
Methodology
Verdict applies the methodology of AAOIFI Shari'a Standard No. 21: Financial Papers (Shares and Bonds): qualitative screening for prohibited business activities, plus three quantitative caps. Interest-bearing debt < 30% of market cap, interest-bearing securities < 30%, and non-permissible income < 5% of revenue.
Sources and scholars
- AAOIFI Shari'a Standard No. 21: Financial Papers (Shares and Bonds)
- S&P Dow Jones Indices: S&P Shariah Indices Methodology (accounting-based screens and the compliance buffer)
- S&P Dow Jones Indices: Dow Jones Islamic Market Indices Methodology
Frequently asked
Why does HalalScreener still show Not Halal when the debt ratio is back under 30%?
Because the ratio has to clear the limit by 1.5 points of market cap before a verdict relaxes. Under 30% but over 28.5% is inside the band where a normal daily price move would flip it straight back. Once the ratio is under 28.5% the verdict relaxes.
Does the margin ever delay a stricter verdict?
No. A stricter verdict publishes as soon as a ratio is over its limit. The margin applies only in the lenient direction.
Do the Shariah index providers do the same thing?
The S&P Shariah methodology keeps a company compliant while it is within two percentage points of the leverage maximum and removes it only after three consecutive reviews over the line, with the mirror rule for re-entry. The Dow Jones Islamic Market and S&P Shariah indices also divide by an averaged market capitalization. HalalScreener's buffer works only in the lenient direction.
Where can I see every verdict change?
The public verdict-change log lists each change with its date, direction and the ratio behind it, and every stock page carries its own compliance history. Pro members also get Early Warning for holdings that are close to a line.
Check a verdict yourself
Our screener grades US-listed stocks, ETFs, and crypto against AAOIFI Standard 21, plus major global companies through their US ADRs and Bursa Malaysia listings. The verdict, grade, and debt ratio are free.
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