How to Purify Haram Income — A Calculation Walkthrough

If your money has ever touched interest — a conventional savings account, a fixed deposit, a government bond, even a late-payment rebate — part of what sits in your account isn’t really yours. Islamic finance calls this haram income, and the remedy isn’t to ignore it or to quietly absorb it into your wealth. It’s to separate it out and dispose of it through a process called purification (takhallus).

Purification is not zakat, it’s not sadaqah, and it’s not a donation you get rewarded for. It’s returning money to where it doesn’t corrupt yours. And because it involves specific amounts — interest statements, dividend ratios, mixed revenues — it helps to walk through the calculation the way you’d do any other financial computation: identify it, measure it, separate it, and dispose of it.

What counts as haram income

Not all impure income looks the same. The common sources fall into four groups:

1. Interest (riba). Markup credited on conventional savings/current accounts, fixed deposits, prize-bond interest components, government bonds, and any loan interest received. This is the most common source and the most clearly defined.
2. Clearly impermissible earnings. Gambling and lottery winnings, income from selling alcohol, pork, or interest-based financial products, bribes, and theft proceeds. These must be disposed of entirely.
3. Mixed income — dividends and business revenue. If you hold shares in a company that earns a small portion of its revenue from impermissible sources (say, interest income on its own cash, or a minor haram product line), the dividend you receive carries that portion. Sharia screening standards (such as AAOIFI’s) typically tolerate up to 5% non-compliant revenue; the impure slice of your dividend must be purified.
4. Late-payment penalties received. Charges you received because someone paid you late often include a riba component and should be purified.

The calculation method differs by type: interest is separated rupee-for-rupee, mixed dividends are purified by ratio, and wholly impermissible income is given away entirely.

The rules of purification (what most people get wrong)

Before the numbers, the rules — because four common mistakes undo the whole exercise:

• It’s not zakat. Disposing of haram income never counts toward your zakat obligation, and it doesn’t earn you sadaqah reward. The intention is disposal, not charity. You are simply removing what doesn’t belong in your wealth.
• You may not benefit from it. You can’t spend purified money on yourself, your family, or your business — and the majority of scholars exclude using it for mosques or religious texts, since those deserve clean funds. It goes to the poor, the needy, or general public welfare (hospitals, clean water, disaster relief).
• Don’t delay without reason. Once you know the amount, dispose of it promptly. Scholars advise against holding it “until a good cause comes along” — it shouldn’t be mixed back into your spending in the meantime.
• Estimate when you’re unsure. If bank statements are lost or the interest can’t be separated exactly, estimate conservatively — on the higher side — rather than ignoring it. Over-purifying is safe; under-purifying leaves the problem in place.

Step 1 — identify the haram portion

Pull the actual figures. This is a data-gathering step, not a guessing step:

• Bank interest: your annual account statement or the bank’s markup certificate shows interest credited for the year. In Pakistan, conventional savings accounts in 2026 have paid roughly 9–11% markup; the statement line item is the exact number.
• Fixed deposits / bonds: the profit schedule or maturity certificate gives the return.
• Dividends: use the company’s annual report or a Sharia-screening provider’s purification ratio (e.g., 3.2% of the dividend is non-compliant).
• Everything else: receipts, winnings slips, or a conservative estimate.

Step 2 — separate it from the principal

This is the core calculation, and it’s simple: the haram amount is disposed of in full; the principal stays yours. If Rs 2,400,000 in a conventional savings account earned Rs 216,000 in markup over a year, the Rs 2,400,000 remains your wealth (and counts toward zakat); the Rs 216,000 must go. Never “net off” — you don’t subtract the interest from your zakat, and you don’t pay zakat on the interest itself (you no longer own it the moment you decide to dispose of it).

Worked example: salary earner with bank interest and a mixed dividend

Meet the example case (a composite, not a real person): a salaried professional earning Rs 150,000/month who kept Rs 2,400,000 in a conventional savings account through the year and received a Rs 60,000 annual dividend from a listed company.

Step 1 — interest identified.
– Annual markup credited (from the bank statement): Rs 216,000 (9% of Rs 2,400,000).

Step 2 — dividend purification.
– The screening report gives a purification ratio of 4% for the company.
– Impure slice = 4% × Rs 60,000 = Rs 2,400.

Step 3 — total purification amount.
– Rs 216,000 + Rs 2,400 = Rs 218,400.

Step 4 — dispose of it correctly.
– Give Rs 218,400 to eligible recipients — the poor and needy, or a general welfare cause — with the intention of disposal, not reward. Do not count it as zakat. Do not give it to a mosque building fund.

Step 5 — handle the remaining wealth normally.
– The principal Rs 2,400,000 stays in his wealth calculation and is subject to zakat at 2.5% if above nisab (that’s Rs 60,000 zakat — a separate obligation, calculated separately).

Notice what happened: the total money leaving his hands this year is Rs 278,400 (Rs 218,400 purification + Rs 60,000 zakat), but the two flows are never mixed, never netted, and never confused. Purification removes what was never his; zakat fulfills an obligation on what is.

The purification ratio method (for dividends and funds)

When income is mixed rather than purely haram, you don’t give away the whole receipt — you purify the impure fraction:

Purification amount = total dividend received × purification ratio

The ratio comes from the company’s financials: non-compliant revenue ÷ total revenue. If a company earned Rs 800 million total, of which Rs 24 million was interest income, the ratio is 3%. A Rs 100,000 dividend then carries Rs 3,000 of impure income to purify.

Most screening providers publish these ratios annually; mutual funds marketed as Sharia-compliant usually publish their own. If no ratio is published and you can’t compute one, scholars suggest either avoiding the investment or estimating a conservative ratio rather than treating the dividend as fully clean.

What about inflation and “it was a small amount”?

Two edge cases worth settling:

• Interest on a current account you forgot about. Even small amounts count. A current account that paid Rs 3,800 in markup over the year still requires Rs 3,800 of purification. There’s no de minimis threshold in the classical rulings — the amount is small, but so is the effort of giving it away.
• Erosion by inflation. You do not get to keep the interest because “inflation ate the principal’s value anyway.” The riba is riba regardless of inflation; the remedy is disposal, not mental accounting. If you want inflation protection, the Sharia-compliant answer is halal investments, not keeping the interest.

Common questions (the ones with real consequences)

Can I use interest money to pay my taxes?
Scholars differ. Some permit directing haram income toward unavoidable payments like taxes or utility bills, on the reasoning that you’d pay them anyway from halal money — so it relieves you without benefiting you. Others consider this still a benefit and require disposal to the poor instead. The stricter view is safer, and it’s the one this walkthrough follows. Either way, it never counts as charity or zakat.

Can haram income be given to a mosque or madrasa?
The majority view says no — houses of worship and religious instruction deserve clean funds. Give it to the poor, the sick, disaster relief, or public welfare instead.

What if I spent the interest already, before I knew the ruling?
Purify an equivalent amount from your current halal wealth now. The obligation attaches to the amount, not to the specific notes. Estimate if you must, and err on the higher side.

Does purification apply to the whole salary if my employer deals in interest?
No. A salary for halal work is halal even if the employer is a conventional bank or earns interest elsewhere — your contract is for your labor, not for the riba. (Working directly in interest transactions, like writing loan contracts, is a separate question for a scholar.)

I have a prize bond that won. Is the prize halal?
Prize bonds are debated among scholars; those who permit holding them generally require purifying the prize amount or a portion of it. If you follow scholars who prohibit them, dispose of the winnings.

What if I genuinely can’t determine the interest amount?
Estimate conservatively from the balance and the prevailing markup rate, and purify the higher estimate. Banks issue markup certificates on request, so “I don’t know” is usually fixable with one phone call.

Can I purify gradually, month by month?
Yes — nothing requires a single lump disposal. Many people purify monthly as interest is credited, which keeps the accounting clean. The key is that each identified amount is actually disposed of, not just noted.

A simple annual routine

1. At year-end (or on your zakat anniversary — doing both together is efficient), pull the interest/markup figure from each account.
2. Multiply each dividend by its purification ratio.
3. Add the totals: that’s this year’s purification amount.
4. Dispose of it to eligible recipients with the intention of removal, not reward.
5. Calculate zakat on your remaining, clean wealth separately.

Try it: Once your wealth is purified, the zakat calculator applies the 2.5% to your clean holdings, and the nisab calculator converts the threshold into your currency. For the complete background, start with the zakat pillar guide.

FAQ

What is purification of income in Islam?
It’s the process of removing haram (impermissible) earnings — like bank interest — from your wealth by giving the impure amount to the poor or public welfare, with the intention of disposal rather than charity or reward.

Is purifying haram income the same as zakat?
No. Purification removes money that was never rightfully yours; it earns no reward and can’t count toward zakat. Zakat is a separate 2.5% obligation on your lawful wealth above the nisab.

How do I calculate how much to purify?
Identify each haram source: interest credited (exact figure from your bank statement), dividends × the company’s purification ratio, and any fully impermissible income (given away entirely). Add them up — that’s your purification amount.

Where should purified money go?
To the poor and needy, or general public welfare such as hospitals, clean water projects, or disaster relief. The majority of scholars exclude mosques and religious texts, since those deserve clean funds.

Can I keep interest if the amount is very small?
No. There’s no minimum threshold — even a few thousand rupees of markup must be purified. Small amounts are the easiest to dispose of, so there’s no hardship argument.

What is a purification ratio?
The fraction of a dividend attributable to a company’s non-compliant revenue (non-compliant revenue ÷ total revenue, often 1–5%). Multiply your dividend by this ratio to find the amount to purify.

I didn’t know interest was haram when I earned it. Do I still purify?
Yes. The ruling attaches to the money, not to your knowledge at the time. Estimate the amount if records are missing, err on the higher side, and purify it now.

Can purified money be used to pay zakat on my behalf?
No. Purified money cannot fulfill your zakat obligation — zakat must come from your lawful wealth. Mixing the two invalidates both the purification and the zakat.