Purification is the least glamorous and most skipped step in halal investing, and in India it is also the step with the best tooling relative to the market's size, thanks to one institution's insistence. TASIS, the Mumbai certifier whose screens power NSE's Shariah indices, prints its position without qualification: purging is mandatory; in order to maintain Shariah-compliant investments, an investor has to purge out impure income (interest) accrued from investments. This guide explains why purification exists, how the arithmetic works for Indian stocks and funds, and where the published calculators are. Verified against tasis.in and fund pages on 2026-08-06.
Ready to compare halal options?
Why screened investments still need cleaning
The screening thresholds that make a stock investable are tolerances, not clean bills of health. TASIS allows interest income up to 2.5% of a company's total income; AAOIFI-style screens allow non-permissible income up to 5% of revenue. Those allowances exist because a listed company that earns literally zero interest is nearly impossible to find: corporate treasuries hold deposits, and deposits in India bear interest by regulatory mandate. So a sliver of most compliant companies' earnings is impure, that sliver is embedded in the dividends you receive and arguably in retained earnings, and Shariah scholarship resolves the tension through purification: you compute the impure fraction and give it away, keeping your investment return clean.
The mechanics for direct stock holdings
The core arithmetic is a proportion. If a company's interest income was 1.8% of its total income for the year, then 1.8% of the dividend it paid you is impure: on Rs 10,000 of dividends, Rs 180 leaves the portfolio as purification. TASIS formalises this as the Income Purification Ratio, published for the stocks it screens, and the NSE Shariah index methodology defines it so index investors can purge pro rata. In practice you will not compute this from annual reports yourself: the screening apps do it per holding. Islamicly calculates purification amounts and issues dividend purification insights, Musaffa includes a purification calculator in its paid tier, and IslamicTijarat includes a purification calculator in its free tier, the only app that does. If you hold direct stocks without any such tool, you are guessing, and most people who guess, skip.
One methodological note stated honestly: scholars differ on whether purification applies only to dividends received or also to your share of the company's impure income regardless of payout (a stricter computation some standards prefer), and on whether capital gains require purification at all. The dominant retail practice in India, and the one TASIS's ratio-based tooling supports, is dividend-based purification. If you follow a scholar who requires the stricter computation, the same apps' ratios feed that arithmetic too.
The mechanics for fund investors
Fund purification depends entirely on whether the fund house does the work for you. Tata Ethical Fund is the standout: its Scheme Information Document commits to periodically notifying prohibited income per unit on the Tata Mutual Fund website, and TASIS hosts a purging calculator specifically for the fund. Multiply the published per-unit figure by your units, donate the result. This is the only institutionalised, fund-specific purification arrangement in Indian retail investing. Taurus Ethical Fund publishes no equivalent per-unit purification notice we could verify, and Quantum Ethical Fund publishes no purification reporting at all, which we flag in both fund guides. For Shariah BeES, the index methodology's Income Purification Ratio is the reference, applied to distributions and your pro rata share.
Among the advisory products, Green Portfolio administers dividend purification notifications to subscribers of its Islamicly-monitored ethical products, a genuine differentiator; SenSage states plainly that purging of impure income must be done by investors individually; and Zamzam Capital's published methodology includes purification criteria. When comparing advisers, administered purification versus do-it-yourself purification is a real feature difference, not marketing.
What to do with the purified money
The uniform instruction across the fatwa literature: give the impure amount to the poor without intention of reward. Purification money is not sadaqah earning you spiritual credit; it is the disposal of income that was never cleanly yours. The rulings surveyed in our EPF purification guide, which draw on the same principles, specify donation to eligible poor recipients, with the majority position directing it away from mosque construction. Keep the intention correct: removal, not reward. Practically, pick recipients or organisations that reach the genuinely poor, transfer the computed amount, and keep a record so you know it is done.
A workable annual routine
Purification fails through friction, so reduce the friction: once a year, at a date you will remember, pull your dividend history from your broker statement, run your screener's purification calculation across your holdings, add the per-unit figures for any funds that publish them, and make one consolidated donation. SIP investors in Tata Ethical should keep statements across years since units bought at different times carry different published amounts. If your total impure income for the year is a few hundred rupees on a small portfolio, purify it anyway; the habit matters more than the amount, and the arithmetic only gets heavier as the portfolio grows. Screened investing without purification is, in TASIS's stated framework, incomplete. The tools exist, several of them free. Use them. Verified 2026-08-06.
A worked example, numbers included
Concrete arithmetic, with invented but realistic figures. Suppose your year's dividends: Rs 12,000 from Stock A, whose purification ratio per your screener is 1.5%; Rs 8,000 from Stock B at 2.2%; and you hold 500 units of Tata Ethical Fund, which published prohibited income of, say, Rs 0.40 per unit for the year (illustrative figure; use the actual published number). Stock A: Rs 180. Stock B: Rs 176. Fund: Rs 200. Total purification due: Rs 556, donated to the poor without intention of reward, ideally before your zakat date so the two obligations stay distinct in your records. Twenty minutes once a year, most of it done by calculators. The reason we print the arithmetic is that vagueness is why people skip purification; seen once, it is obviously manageable.
Purification is not zakat
The two obligations get conflated constantly, so the distinction earns its own heading. Zakat is a levy on your wealth: computed on your investment holdings' value at your zakat date, owed annually on wealth above the nisab, spent on the categories the Quran specifies, and counted as the worship it is. Purification is a disposal of income that was never cleanly yours: computed on impure slivers in dividends, owed when the income arrives, given without intention of reward, and directed to the poor under the majority instruction on riba disposal. Paying one does not discharge the other, and the arithmetic bases are different (portfolio value versus impure income received). Several of the screening apps (IslamicTijarat free tier, Islamicly, Musaffa paid) calculate both separately, which is the tooling reason there is no longer a practical excuse to skip either. Verified 2026-08-06.
Common purification mistakes to avoid
The most frequent mistake Indian investors make is treating purification as optional because the amounts feel small. On a portfolio of a few lakh rupees the annual purge might be a few hundred rupees, and it is tempting to skip the bookkeeping. The scholars behind India's screening methodologies are clear that the obligation does not scale with convenience. A small impure amount is still impure, and the discipline of calculating it annually is part of what separates a genuinely halal portfolio from an approximately halal one.
Compare providers in your state
See side-by-side comparisons of Shariah-compliant products, or let our matcher recommend the best options for your situation.
A second mistake is deducting purification from your zakat. The two are separate obligations with separate logic. Zakat is a levy on your own lawful wealth. Purification is the removal of income that was never lawfully yours to begin with. Paying one does not discharge the other, and the recipients rules differ: zakat has eight defined categories of recipient, while purification money is generally directed to public welfare without the expectation of reward.
Finally, do not rely on a platform to purify for you unless it explicitly says it does. Most Indian mutual funds, including the certified ethical funds, publish the impure proportion but leave the actual giving to you. Check the fund's Shariah compliance note each year, apply the published percentage to your income from the fund, and give the result away. The process takes minutes once a year. Verified August 2026.