Halal investing is the practice of building a stock portfolio whose underlying businesses comply with Islamic commercial law (sharia). It is a niche worth taking seriously: there are roughly 2 billion Muslims worldwide, the global Islamic finance industry is now estimated at over $4 trillion in assets under management, and the AAOIFI screen excludes only about 12,000 of the roughly 60,000 listed stocks on major global exchanges, which still leaves a deep and tradeable universe.
But the practical retail experience of halal investing in 2026 is messy. Most "halal stock apps" use shallow screens. Most public halal stock lists go stale within months. Most explainers skip the part where scholars genuinely disagree. This guide is the comprehensive walk-through I wished existed when I started indexing halal-eligible stocks for invest-like.com.
It covers what halal investing is, the two major screening standards in use today, the four financial-ratio tests that drive almost every screen, what AAOIFI Standard 21 actually says, where scholars disagree, the common pitfalls, and a 10-step checklist for getting started.
What halal investing is (and is not)
In Islamic commercial law, returns earned from certain economic activities are considered impermissible (haram). The headline prohibitions are riba (interest income on money lent), maysir (gambling), gharar (excessive contractual uncertainty), and dealing in haram goods (alcohol, pork, conventional weapons, adult entertainment, etc.).
In practice these prohibitions push Muslim investors away from:
- Conventional banks, insurance companies, and pure asset managers (their earnings come substantially from interest)
- Alcohol, tobacco, gambling, adult-entertainment, and conventional-weapons producers
- Highly leveraged businesses (their financing structure relies on interest-bearing debt)
- Companies holding more than a small fraction of their value as cash earning interest
And toward:
- Real businesses producing goods and services
- Businesses with conservative balance sheets (low interest-bearing debt as a share of market cap)
- Businesses that earn their money from productive operations rather than from holding piles of cash
Importantly, halal investing is not ESG investing, ethical investing, or socially responsible investing. There is overlap (both ESG and halal screens exclude tobacco and gambling) but the philosophies are different. ESG ranks companies on environmental, social, and governance criteria. Halal asks a binary religious-law question: does the underlying economic activity and capital structure comply with sharia.
A halal-screened portfolio can include defence primes (most halal screens consider government-funded weapons production permissible, with civilian-defence exclusions), oil and gas majors (extraction is permissible; the debt ratio test then determines pass/fail), and large-cap tech that happens to carry low debt. Many ESG-strict portfolios exclude all three.
The two screening standards in use today
Almost every halal stock screen in 2026 derives from one of two published standards.
AAOIFI Standard 21
The Accounting and Auditing Organization for Islamic Financial Institutions, based in Bahrain, publishes the most-cited standard for screening listed equities. Standard 21 ("Financial Papers (Shares and Bonds)") sets the criteria. AAOIFI's standards are used or referenced by central banks in over 40 jurisdictions and are considered the institutional benchmark.
AAOIFI is stricter on financial ratios than the alternative standards below. The interest-bearing debt cap is 30 percent of market cap, the non-permissible income cap is 5 percent, and the liquid-assets cap is 30 percent.
Dow Jones Islamic Market Index methodology
The S&P Dow Jones Islamic Market (DJII) family of indices is the most widely tracked institutional halal benchmark. The DJII methodology is published in detail and uses a similar four-test structure to AAOIFI but with looser numerical thresholds: the debt ratio cap is 33 percent (vs AAOIFI's 30 percent), and the liquid-assets cap is the same 33 percent.
The result: the DJII universe is consistently larger than the AAOIFI universe. A stock at debt-ratio 31 percent of market cap passes DJII but fails AAOIFI. Many of the most-popular consumer halal apps use DJII or even-looser custom screens, which is why their "halal-eligible" lists often look bigger than what AAOIFI-trained scholars would accept.
A small number of other standards exist (MSCI Islamic, FTSE Shariah, Yasaar). They mostly fall between AAOIFI and DJII in strictness.
The four screens (the core of every standard)
Every serious halal stock screen runs the same four tests. The differences between standards live in the numerical thresholds, not in the structure.
Test 1 - Primary business activity
The core business of the company cannot derive its revenue from impermissible activities. The exclusion list under AAOIFI Standard 21 covers:
- Conventional financial services: commercial banks, insurance (except family takaful), conventional asset management, broker-dealers in conventional securities
- Alcohol: producers, distributors, and major retailers
- Tobacco: producers and major distributors
- Pork-related products: producers and processors of pork or pork-derived ingredients
- Conventional weapons: producers of munitions and weapons systems sold for offensive military purposes (defence services and dual-use technology are usually permissible)
- Adult entertainment: producers and distributors of pornography
- Gambling: casinos, betting platforms, lottery operators
- Cannabis: producers and distributors, whether medical or recreational
Note that the exclusion is on the primary business. A company can earn a tiny fraction of revenue from a tangentially-related impermissible activity and still pass this test, provided the financial-ratio tests below also pass and any contaminated income is purified (more on that below).
Test 2 - Interest-bearing debt ratio
The company's total interest-bearing debt, divided by the trailing 36-month average market capitalisation, must be below the cap.
- AAOIFI cap: 30 percent
- DJII cap: 33 percent
This is the test that most often determines whether large-cap consumer-discretionary and industrial names pass. A highly leveraged business is, structurally, a creature of interest finance, and its compounding largely depends on cheap debt staying cheap.
Test 3 - Non-permissible income ratio
The company's income from impermissible sources, divided by its total income, must be below the cap.
- AAOIFI cap: 5 percent
- DJII cap: 5 percent
Examples of non-permissible income that slip into otherwise-halal businesses:
- Interest income on excess cash holdings
- Revenue from a minority interest in a non-halal subsidiary
- Lease income on a property let to a non-halal tenant
When a stock has a small slice of non-permissible income (say 2 percent), it still passes the screen, but the investor is generally required to purify the corresponding fraction of dividends or capital gains by donating that amount to charity. Most halal-screened ETFs do this automatically; retail investors holding individual stocks need to track it themselves.
Test 4 - Liquid assets ratio
The company's cash plus interest-bearing securities plus accounts receivable, divided by the trailing 36-month average market cap, must be below the cap.
- AAOIFI cap: 30 percent
- DJII cap: 33 percent
This test is designed to exclude companies that have transformed into cash-piles earning interest income rather than productive operating businesses. A company sitting on 50 percent of its market cap in T-bills is structurally a money-market fund with an operating sideline.
Where scholars actually disagree
The four screens above sound deterministic but they hide several active scholarly disagreements that affect which stocks pass:
Disagreement 1: Which denominator for the financial ratios? AAOIFI uses 36-month average market cap. Some scholars argue for total assets instead (which is what the older Yasaar standard used). The two give materially different lists in growth-stock-heavy markets - high-multiple software companies have much larger market caps than asset bases, so debt-to-marketcap looks low but debt-to-assets looks high.
Disagreement 2: How strict on the primary-business test? A company that earns 4 percent of revenue from non-halal activities passes AAOIFI's 5 percent cap. Some Hanafi scholars treat this as still permissible. Some Shafi'i scholars treat the threshold as 0 percent (no haram revenue at all). Most retail apps follow AAOIFI; pious individuals may want zero-tolerance.
Disagreement 3: Are defence primes permissible? AAOIFI excludes "conventional weapons" but does not define the term precisely. Some scholars exclude all weapons manufacturers; some exclude only offensive-weapons producers and permit defensive/dual-use technology. The classic case is Lockheed Martin (offensive aircraft) versus Northrop Grumman (mostly defensive systems and IT services).
Disagreement 4: Is purification of dividends mandatory? Most scholars say yes. Some say it depends on intent (if you bought knowing the business had haram income, purify; if you discovered it after buying, you can sell rather than purify). Most retail apps don't help with the calculation, leaving the burden on the investor.
Disagreement 5: Are derivatives ever permissible? AAOIFI bans most conventional derivatives (futures, options, CDS) because of maysir and gharar. Some modern scholars permit certain hedging futures (currency, commodity) on the grounds that real businesses use them to manage risk, not to gamble. This affects which fund structures are permissible.
The honest answer is that there is no single global authority. AAOIFI gets the most institutional weight; individual mosques and madhhabs (Hanafi, Maliki, Shafi'i, Hanbali) may have slightly different rulings. Investors should pick a standard, document why, and stick with it.
Common mistakes retail investors make
After tagging the AAOIFI-eligibility of every stock in the invest-like universe, a few recurring mistakes show up:
Mistake 1: Treating "halal-eligible" as "good investment." AAOIFI eligibility is necessary but not sufficient. A halal-eligible stock with collapsing margins and rising debt is still a bad investment. The discipline of halal investing must be layered onto value-investing discipline, not substituted for it.
Mistake 2: Relying on a single static list. Halal eligibility shifts every quarter as fundamentals shift. A stock that passes the debt-ratio test today can fail it after a major M&A deal. Any halal investor not running quarterly re-screens is holding a slowly-decaying list.
Mistake 3: Confusing index ETFs with individual halal screening. Buying SPUS (the largest US halal ETF) gets you a screened universe and automatic purification, but it also gets you the entire screened universe at index weights, regardless of quality. Individual stock investors get to layer quality screens on top, but lose automatic purification.
Mistake 4: Forgetting cash holdings within funds. Many "Islamic" mutual funds hold treasury bills and interest-bearing cash equivalents. Read the prospectus; ask about the cash-management strategy.
Mistake 5: Ignoring the primary-business test on subsidiaries. A holding company can have a halal-eligible primary business but own a sub-stake in a non-halal sub. Whether this fails depends on how AAOIFI counts subsidiaries; most retail screens get this wrong.
Mistake 6: Buying alcohol-adjacent stocks because the headline excludes only "primary alcohol producers." Companies that earn substantial revenue from selling barley to brewers, or that own bars/restaurants serving alcohol, are usually still excluded under a strict reading. Loose screens often miss these.
A 10-step beginner checklist
If you are starting halal investing in 2026, here is the order I'd suggest going through:
- Decide your standard. AAOIFI is the safest default. Document it and stick with it.
- Pick your investment universe. US-listed only? Add European (XETRA, Euronext)? Emerging markets (Saudi Tadawul, KSE, BSE)? Halal-eligibility differs by exchange because reporting standards differ.
- Set your purification rule. Will you purify any non-zero non-permissible income, or only when it exceeds a personal threshold (say 1 percent)? Document.
- Choose your screening tool. Three honest options: (a) an existing halal-aware screener like invest-like.com that runs the AAOIFI tests every quarter, (b) a halal ETF if you want hands-off (SPUS, HLAL, ISWD), or (c) manual screening from public filings (laborious; only realistic if you hold ten stocks or fewer).
- Layer in quality. Halal-eligible alone is not enough. Apply a value-investing framework (Buffett-Fit Score, Magic Formula, etc.) to the halal-eligible cohort. The intersection of the two screens is where the high-conviction names sit.
- Build position sizes around sleep-well sizing. Halal eligibility doesn't change basic portfolio construction. Stick to standard concentration limits (no more than 5-10 percent in any one name for retail investors).
- Track purification owed. Each quarter, multiply your dividends and any realised gains by the non-permissible income ratio for each stock. Donate the total to charity. Keep records for tax purposes.
- Re-screen quarterly. Any AAOIFI-eligible stock can flip to ineligible if its balance sheet shifts. Run the four tests at the start of each quarter and trim ineligible positions (with purification of the realised gains).
- Avoid leverage and short-selling. Margin debt is interest-bearing and almost universally considered haram. Short-selling is contentious among scholars (some permit it under specific conditions; many do not).
- Get a second opinion. If you are deploying meaningful capital, run your screening framework past a local scholar or Islamic finance professional. AAOIFI is rigorous but is not infallible; your local madhhab may have specific guidance.
How invest-like.com handles this
For full transparency on what invest-like.com does: every stock in the 12,000-ticker universe is run through the four AAOIFI Standard 21 tests at each quarterly refresh. The result is exposed as a per-stock Halal-eligible / Borderline / Ineligible badge with the underlying numbers (debt ratio, non-permissible income, liquid-assets ratio) shown. A site-wide Halal Mode toggle filters every list (Buffett-Brain verdicts, framework scores, conviction portfolio) to the halal universe.
We do not currently auto-calculate per-investor purification owed (that requires position-level cost basis tracking; planned for the next major release). We do publish the non-permissible income ratio per stock so investors can compute their own purification.
You can toggle the screen on at /halal/ without an account.
What this is not
This guide is a starting point, not a fatwa. I am not an Islamic scholar. The four tests above represent the AAOIFI Standard 21 mechanical implementation, which is the most-widely-accepted institutional screen in 2026. If your local madhhab or scholar has different guidance, follow that guidance - the screen is a tool, not an answer.
It is also not investment advice. Halal eligibility is a necessary filter, not a sufficient one. The intersection of halal-eligible AND quality-screened (Buffett-Fit, Magic Formula, etc.) is where the actual investable cohort sits - not in halal-eligible alone.
Further reading on invest-like.com
Educational only. Not investment advice.