The method behind the calculator

What Zakat is

Zakat is the third pillar of Islam. It is an annual obligation on qualifying wealth, payable at a fixed rate to specified categories of recipients. It is neither a donation nor a tax on income: it is a right that the poor hold over the wealth of those who possess it.

The classical definition is the transfer of a fixed portion of specified wealth to a poor Muslim, for the sake of Allah. Two consequences follow, and they govern the rest of this page. Zakat attaches to wealth rather than to earnings, so what matters is what you own on your Zakat date, not what passed through your hands during the year. And it attaches to specified wealth: some assets fall within the base and some do not, by principle rather than by preference.

The purpose is not revenue. Zakat purifies wealth of the attachment that hardens the heart, keeps capital in circulation rather than hoarded, and gives the poorest a standing share in the prosperity of the community. That is why the rate is low and fixed, and why the base is drawn widely.

Who pays, and on what

Six conditions must be satisfied before Zakat becomes due. Three concern the person, three concern the wealth.

Ownership governs the rest

Most errors in Zakat arise here rather than in the arithmetic. Zakat is due on wealth owned by individuals, by sole traders, by partners in a partnership on their own share, by shareholders in a private company on the zakatable assets behind their share, and by beneficiaries of a bare trust they control.

It is not due on wealth held by a charity, a waqf, a charitable trust, an interests-in-possession trust, or a discretionary trust in which the beneficiary has no fixed entitlement and is not the trustee. A discretionary beneficiary holds an expectation, not an asset. When a distribution is made and comes into the beneficiary's hands, it becomes cash and is zakatable from that point.

Nisab and the year

Nisab is the threshold above which Zakat becomes due. It is fixed in the Sunnah by weight of gold and silver: twenty dinars of gold, or two hundred dirhams of silver.

The calculator displays both in your currency, priced from live metal rates, and allows either gram standard to be selected in the bar at the top of the page.

Which metal applies

Where gold alone is held, the gold nisab applies. Where wealth is mixed, comprising cash, shares and business stock, the silver nisab is generally applied, because it is the lower of the two in monetary terms and therefore brings more wealth within the obligation. That is the default setting. The gold basis remains available where local guidance prefers it.

This explains a result that people often find counter-intuitive: a person may be liable on a modest cash saving and not liable on a substantial gold holding. The threshold is a fixed measure, not an assessment of wealth in the abstract.

The lunar year (hawl)

Zakat falls due when a lunar year of roughly 354 days has passed over wealth that has remained at or above nisab. Three practical points follow.

• The year begins on the day net zakatable wealth first reaches nisab. That date should be recorded; the calculator shows each year's due date together with its approximate Hijri equivalent.
• Fluctuation during the year is immaterial. The value on the year-end governs. Wealth that falls below nisab and later recovers does not break the cycle.
• Where the wealth is depleted to nothing, the cycle ends and a new start date is taken.

2.5%, or 2.577%

The rate is one-fortieth, or 2.5%, of net zakatable wealth over a lunar year. Where the Gregorian calendar is used instead, AAOIFI permits a compensating rate of 2.577%, which accounts for the eleven-day difference between the two years. The calculator offers both. The underlying obligation is unchanged; only the measure of the year differs.

The net-assets method

The calculation reduces to one operation. Add the zakatable assets owned on the Zakat date, deduct the liabilities falling due within the following twelve months, and pay 2.5% of the balance where that balance reaches nisab.

This is the net-assets method. It is the approach taken in AAOIFI's Shari'ah Standard on Zakat and in institutional practice generally. Three features of it are worth setting out.

Zakatable assets

Zakat attaches to wealth that is productive by nature, such as cash; to wealth acquired with the intention of trade; and to wealth that grows in its own units, such as livestock and produce. Six classes cover nearly everything.

Two rules run through the six classes. Value is taken at the Zakat date rather than at cost, so appreciation is within the base and depreciation is not. And only the zakatable element is counted: the gold content of a piece of jewellery rather than its stones or workmanship, the cash and stock of a company rather than its factory.

What is not zakatable

Assets held for use rather than for growth or trade fall outside the base. They are not exempt by concession; they do not meet the definition of productive wealth.

The last row records a genuine difference between the schools rather than an oversight. The calculator changes its answer when the school is changed. The Hanafi position, under which all gold and silver is zakatable whatever the carat or the use, is the default and follows CIEA's teaching material.

Liabilities

Debts reduce the Zakat base because Zakat is due on net wealth, and a person under an obligation is not wealthy to the extent of that obligation. The concession is bounded in two ways: by time, since only what falls due within twelve months is deducted, and by the nature of the obligation itself, since a debt and a rent are not the same thing.

Islamic home finance is not deducted as a debt

An Islamic home finance facility is not a loan, and the periodic payment under it is not a repayment of principal. Where the facility is structured as ijarah, or as a lease-to-own arrangement in which the financier retains ownership of the property, the payment is rent. Rent that has fallen due and remains unpaid at the Zakat date is deductible in the same way as any other accrued rent, and rent not yet due is not a liability at all. The whole of the outstanding balance is never deducted, because it is not owed.

A conventional interest-bearing mortgage is treated differently. It is a debt, and twelve months of repayments are deducted, with the outstanding principal excluded. The distinction is not a preference between structures; it follows from what each obligation actually is.

Murabaha, diminishing musharakah and the various hybrid structures cannot be handled by a single field. Their treatment turns on the contract terms, on who owns the property on the Zakat date, on how the profit element is characterised, and on the school followed. Facilities of this kind are not deducted in the calculator. Write to [email protected] with the facility documents, and CIEA will advise on the case.

The strict basis

Deducting one year of a conventional mortgage follows the treatment of long-term debt: the principal is not owed now, so only the portion falling due in the year is deducted. A stricter view, held by a number of contemporary scholars, deducts only obligations incurred to acquire zakatable assets, on the reasoning that debt secured against a house on which no Zakat is paid should not reduce Zakat on the assets on which it is.

The calculator carries the strict basis as a switch, off by default. Rent under an ijarah remains deductible under either setting, since rent is an expense already incurred rather than a debt secured against property. Both positions are held in practice; neither should be alternated between years without disclosure.

Net wealth cannot fall below zero

Where deductions exceed assets, net zakatable wealth is nil and no Zakat is due. No credit is carried forward.

Modern assets in detail

These are the holdings that a single total-wealth figure cannot capture, because the answer depends on facts about the asset rather than on its market value.

Listed shares and funds

The look-through is the accurate method: Zakat is due on the zakatable assets owned through the company, not on the company's market price. Most Australian and global index funds publish a zakatable-asset ratio for this purpose, commonly between 5% and 30% depending on the weight of financials in the index. Where nothing is published, 25% is the working proxy used in CIEA's worksheet.

Superannuation

Access determines liability, because Zakat requires ownership and effective possession.

• Preserved superannuation, before preservation age. The balance cannot be accessed, directed or disposed of. On the view followed here, no Zakat is due; on receipt it is zakatable from that point, without arrears for earlier years.
• Accessible but not withdrawn. The amount that could be withdrawn is wealth in possession and is zakatable.
• Self-managed super funds. Treatment depends on the fund's asset mix, the member's degree of control and the school followed. Write to [email protected] with the fund's asset schedule before entering a figure.

The area is contested. Some scholars require Zakat annually on accessible balances; others defer the whole balance to drawdown. One view should be followed consistently.

Crypto-assets and NFTs

Private companies, partnerships and trusts

Zakat is not due on the value of a business, nor on goodwill, plant or premises. It is due on the proportionate share of the company's zakatable net assets:

(cash + receivables + stock in trade + zakatable investments - payables due within 12 months)
    x ownership percentage

That figure is entered with the percentage set to 100. Where the accounts are not available, 25% of the share's value is a working fallback. In a partnership each partner discharges Zakat on his or her own share; the firm does not discharge it on behalf of all.

In trusts, ownership and control decide. A bare trust, or a trust controlled as trustee and beneficiary, is zakatable in full. A discretionary trust in which one is a potential beneficiary without fixed entitlement, and is not the trustee, is not zakatable until a distribution is made.

Property

Where the intention behind a buy-to-sell property changes to retention, it ceases to be stock and the liability on the property ends. Rent subsequently received is zakatable as income.

Amounts owed to you

A strong debt, being a loan advanced or an invoice for goods supplied, is zakatable. It may be paid annually, or deferred to receipt with the earlier years discharged at that point. A weak debt, such as unpaid wages, an undistributed inheritance or an expected payout, is not zakatable until received, and nothing is owed for the years before. A bad debt that the debtor denies and that cannot be established is outside the base altogether.

Ushr and livestock

Two categories sit outside the 2.5% calculation. They are included in the calculator so that a farmer is not left to work them out separately, but they are reported as distinct obligations rather than folded into the Zakat total.

Ushr on produce

• 10% where the land is watered by rain, rivers or other natural means.
• 5% where it is irrigated at cost, by pump, spray or channel.
• Where both apply, the rate follows the predominant method; 7.5% is used as a proportional estimate.
• Due at harvest. No lunar year need pass, and debt does not remove the obligation.
• Produce grown in a backyard for household use is outside it; produce grown for sale is within it.
• Payment may be made in kind or in cash value.

Livestock

Zakat on livestock is paid in animals, by band, and applies only where the herd grazes freely on common land for most of the year and is kept for milk and breeding. Animals fed at the owner's cost, kept for transport or work, or held for consumption are outside it. Animals held for trade are business stock instead, valued at selling price.

The calculator applies the full classical banding, including the higher camel and cattle combinations, and reports what is due in kind rather than converting it to cash.

Worked examples

Three households, all Hanafi, all on the silver nisab. For illustration the silver nisab is taken as A$1,457, being 612.36 grams at A$2.38 per gram.

The fourth example sets out the point that a debt and a rent are not interchangeable. The unpaid instalment reduces the base because it is an expense already incurred; the remaining lease payments do not, because nothing is owed on them yet. A conventional mortgage in the same position would have twelve months of repayments deducted instead.

Common errors

1. Valuing at cost. Shares, gold and stock are valued at what they are worth on the Zakat date, not at what was paid for them.
2. Deducting the whole mortgage. Only twelve months of repayments come off a conventional loan, never the outstanding principal.
3. Deducting Islamic home finance as a debt. An ijarah facility is rent: only rent already due and unpaid is deductible. Murabaha and diminishing musharakah facilities are referred to CIEA.
4. Counting the family home as wealth to be taxed. It is not zakatable at all, though a conventional loan against it still reduces the base on the default basis.
5. Paying on the full value of a long-term share portfolio. The look-through, or the 25% proxy, applies rather than 100%.
6. Overlooking jewellery. Under the Hanafi view worn gold is zakatable; under the other three schools it is not. Investment gold is zakatable in every school.
7. Ignoring the offset account. It is your money and remains zakatable.
8. Confusing purification with Zakat. Removing impermissible income from a dividend is not a Zakat payment and does not reduce what is owed.
9. Using today's nisab for a past year. Use the nisab of the date on which Zakat fell due.
10. Resetting the year. Wealth falling below nisab during the year does not restart the clock; depletion to nothing does.
11. Paying to an ineligible recipient. Zakat must transfer ownership to an eligible person. A general building fund, a mosque construction project, one's own dependants and a non-Muslim do not qualify.

Sources and further reading

The rules applied in the calculator are drawn from the school texts as summarised in the following, together with AAOIFI's standard and CIEA's own teaching material.

• Mufti Faraz Adam al-Mahmudi, The Fiqh of Zakat (Darul Fiqh, 2015). Conditions, nisab, receivables, liabilities, business assets, ushr, livestock and recipients. darulfiqh.com
• AAOIFI, Shari'ah Standard No. 35 on Zakat. The net-assets method, treatment of liabilities payable within the year, and the 2.577% Gregorian adjustment.
• CIEA, Zakah: Calculation Made Easy (Masjid Ibrahim, Perth, 2024). Seminar notes and worksheet on cash, receivables, gold, property, investments and crypto-assets.
• CIEA, Detailed and Summarised Zakah Calculation Worksheets. The asset and liability tables this calculator digitises.
• Quran 2:110, 2:261, 2:274, 9:34-35, 9:60, 9:103; Sahih al-Bukhari; Sunan Abu Dawud.