Pakistan's Shariah screens tolerate up to 5% of a company's revenue coming from non-compliant sources, almost always interest earned on bank balances. Tolerance is not approval. The scholars who set the screens paired them with a duty: whatever fraction of the company's income was impermissible, that fraction of your dividend does not belong to you and must be given to charity. This is purification (tatheer), and it is the least understood obligation in halal investing. The good news is that the formula is published, mechanical, and mostly done for you if you invest through funds.
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Why purification exists at all
A zero-tolerance screen would leave almost nothing to invest in; nearly every listed company keeps operating cash in bank accounts that pay interest. The classical solution, adopted by Pakistan's boards including Al Meezan's (chaired by Justice (Retd.) Mufti Muhammad Taqi Usmani), permits investment where the taint is small and incidental, on the condition that the investor derives no benefit from it. Purification is the enforcement mechanism: you strip the impermissible portion out of your return and pass it to charity, keeping only what the halal business activity earned.
The formula Pakistani advisors publish
Al Hilal Shariah Advisors, the firm certifying funds for HBL, ABL, Alfalah and Mahaana, publishes the calculation in its quarterly screening report: compute a charity rate equal to the company's non-compliant income (after tax) divided by its operating profit, then apply that rate to the entire dividend you received, and pay the result to charity. Al Meezan's published version of the same principle says non-compliant income 'is cleansed out as charity as a pro rata ratio of dividends issued by the company.' Same idea: your dividend is treated as carrying the company's income mix, and the impermissible slice exits your wealth.
A worked example
Suppose a screened cement company reports after-tax non-compliant income of Rs 40 million (bank interest, mostly) and operating profit of Rs 2,000 million. The charity rate is 40 divided by 2,000, which is 2%. You hold 5,000 shares and receive a dividend of Rs 8 per share, Rs 40,000 in total. Your purification amount is 2% of Rs 40,000: Rs 800 to charity. The remaining Rs 39,200 is cleanly yours. The numbers change every reporting period, which is why advisors re-screen quarterly and why the ratio must be looked up, not remembered.
Who does the work: funds vs direct investors
If you invest through Islamic mutual funds or ETFs, purification happens inside the fund. Al Meezan lists portfolio purification among its Shariah advisor's formal duties, and every certified AMC's Shariah audit covers it; the returns you see are net of cleansing. If you own stocks directly through a broker such as ZLK Islamic, nobody does this for you. You need each company's non-compliant income figure, available in the screening reports that advisors publish or calculable from annual accounts, and you need to actually pay the charity. In practice, direct investors who skip this are keeping money their own screening methodology says is not theirs.
Where the charity money can go
Purification money is not zakat and does not discharge your zakat obligation; it is the disposal of income you were never entitled to. The scholarly consensus is that it should go to general charitable causes benefiting the poor, without you taking reputational or tax benefit from it where avoidable. Keep it separate in your records from your zakat, which is calculated on your total qualifying wealth at 2.5% and follows its own rules about recipients.
Practical system for a direct stockholder
Keep one spreadsheet: for each holding, record the dividend received, the company's latest charity rate from a published screening report, and the resulting purification amount. Settle the charity quarterly so it never accumulates into a number you resent. If a company's rate is unavailable, the conservative options are to use a reasonable estimate from its accounts (interest income after tax over operating profit) or to apply a flat conservative percentage; document whichever you choose and apply it consistently. An hour a quarter covers a typical portfolio.
If that hour is not going to happen, that is a legitimate answer too; it just means funds are your instrument. The screened index funds and ETFs on the HalalWallet investing hub handle purification institutionally, with the process audited annually under each fund's Shariah certification.
Frequently asked questions
Is purification required if I only have capital gains and no dividends? The formula published by Pakistani advisors applies to dividends. On capital gains, scholarly opinion varies: some require purifying a proportion of gains, others limit the duty to distributed income. Follow one qualified position consistently rather than picking whichever is cheapest each year.
Do Islamic mutual funds really purify, or is it marketing? It is a certified process. Purification appears in the advisors' published methodologies, in the Shariah advisor's formal duties at Al Meezan, and in the annual Shariah audit certificates AMCs publish under the SECP's Shariah Governance Regulations 2023. The amounts flow to charity from the fund before returns reach you.
Where do I find a company's non-compliant income figure? Quarterly screening reports from advisory firms (Al Hilal's March 2026 report covered 533 companies) or the company's own financial statements, where interest income is a line item. The screening reports are the practical source since they compute the ratio for you.
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Can I count purification as zakat? No. Zakat is a worship obligation on your own lawful wealth; purification is the removal of income that was never lawfully yours. They are calculated differently, serve different purposes, and both apply to a stock investor.
What if I have not purified for years? Estimate honestly and catch up. Reconstruct dividends received from your CDC statements, apply reasonable charity rates for those periods, and donate the total. Scholars treat this as a debt to charity that persists until paid, not a lapse that expires.