Zakat on Your ISA: Why the Tax-Free Wrapper Doesn't Reduce What You Owe (Worked Example)
Your ISA being tax-free is a matter between you and HMRC — it has no bearing whatsoever on zakat. Zakat is owed on the wealth you hold, not the wealth HMRC taxes. So a £18,000 Stocks & Shares ISA still counts in full: at the standard 2.5% rate, that is £450 of zakat due on your zakat anniversary.
Why "tax-free" and "zakat-free" are two completely different things
This is the single most common mistake British Muslims make with ISAs, and it's an easy trap. The ISA is a creation of UK tax law: it shelters your returns from Income Tax and Capital Gains Tax (see gov.uk: Individual Savings Accounts). That shelter is purely a feature of the state's tax system.
Zakat is an act of worship governed by the Sharia, not by HMRC. The principle is simple: zakat is due on zakatable wealth you own and have held for a full lunar year (hawl), once that wealth crosses the nisab threshold. Where the money physically sits — a current account, a pension drawdown, a Premium Bond, or an ISA — is irrelevant to the obligation. The wrapper does not exempt the contents.
The standard zakat rate on monetary wealth is 2.5% (one fortieth) of the zakatable balance, paid annually once your total wealth exceeds nisab. Nisab is most commonly set at the value of 612.36g of silver (the lower, more cautious threshold) or 87.48g of gold; most UK scholars and the National Zakat Foundation (NZF) recommend the silver value so that more wealth is captured and more of the poor benefit. Because silver is far cheaper than gold per gram, the silver nisab is the lower bar — and the one most people will clear.
Worked example: an £18,000 Stocks & Shares ISA
Aisha, a 34-year-old NHS pharmacist in Birmingham, sets her zakat anniversary as the 1st of Ramadan each year. On that date she logs into her platform and her Stocks & Shares ISA holds £18,000 — a Sharia-compliant global equity fund. She also has £2,000 in a current account. Her total zakatable wealth is well above the silver nisab, and she has held it for a full lunar year.
Step 1 — Value the wrapper on the anniversary. She uses the market value shown on her platform on 1 Ramadan: £18,000. (Not what she paid in — what it's worth that day.)
Step 2 — Decide the basis. Aisha buys-and-holds a diversified fund. She is happy to take the simple, cautious approach and pay zakat on the full value (see the proxy section below for the lighter alternative open to long-term holders).
Step 3 — Apply 2.5%.
£18,000 × 2.5% = £450
Step 4 — Add the rest of her zakatable wealth. The £2,000 current-account balance adds £50 (£2,000 × 2.5%), so her total zakat for the year is £500. The ISA portion alone is £450.
The fact that every penny of growth inside that ISA is invisible to HMRC changed nothing. The £18,000 counted in full.
Cash ISA vs Stocks & Shares ISA — both use the value on your anniversary
The two ISA types are valued the same way for zakat: take the figure your provider shows on your zakat anniversary date and apply 2.5%. The difference is only in how the value moves.
| ISA type | What you count | Zakat basis |
|---|---|---|
| Cash ISA | The cash balance, including profit/interest-equivalent paid, on your anniversary | 2.5% of the full balance |
| Stocks & Shares ISA | The current market value of the holdings on your anniversary — not the amount invested | 2.5% of full value (or the proxy below for long-term holders) |
| Lifetime ISA | Your deposits + growth held on the anniversary (see below — exclude the unpaid future bonus) | 2.5% of that amount |
A practical note for Cash ISAs: if the "interest" credited to you is a conventional interest payment (riba), it is not yours to keep or benefit from. The correct treatment is to give it away to charity in addition to your zakat, not to count it as wealth you've earned. A Cash ISA from a fully Sharia-compliant provider that pays an expected profit rate (not interest) avoids this issue entirely. Either way, the principal balance is zakatable.
Long-term-hold shares: full value vs the 25% proxy
Here is where long-term investors get a legitimate reduction — but note carefully why. When you own a share, you own a slice of a real company. Only part of that company is "zakatable" wealth in the Sharia sense: its cash, receivables and tradeable stock. Its fixed assets — factories, buildings, machinery — are not zakatable. A pure trader who flips shares like inventory pays on the full market value; a genuine long-term investor may instead pay only on the company's zakatable portion.
Calculating the exact zakatable portion of every holding is impractical, so UK scholars endorse a proxy. The National Zakat Foundation recommends a 25% proxy: assume 25% of the market value is zakatable, then apply 2.5% to that. The arithmetic:
2.5% × 25% = 0.625% of the full holding
Some scholars and bodies use a 30% proxy instead (roughly 0.75% of the full value), based on historical averages for large indices. Both are estimates; the use of estimation is explicitly endorsed by AAOIFI Sharia Standard No. 35 on Zakat, which states that where the exact zakatable amount per share is unknown, zakat may be levied on the portion reached through estimation. The NZF settled on 25% after analysing the FTSE 100 — most companies sampled had zakatable net assets below that figure.
| Approach for Aisha's £18,000 S&S ISA | Effective rate | Zakat due |
|---|---|---|
| Full value (simplest, most cautious) | 2.5% | £450 |
| 25% proxy (long-term holder — NZF) | 0.625% | £112.50 |
| 30% proxy (long-term holder — alternative) | 0.75% | £135 |
Lifetime ISA: count your money, not the government's future bonus
The Lifetime ISA (LISA) lets you contribute up to £4,000 a year, and the government adds a 25% bonus — up to £1,000 a year (confirmed on gov.uk: Lifetime ISA). The zakat question is: do you count the bonus?
The principle is possession and ownership. You count what you actually own on your zakat anniversary — your deposits plus any growth, plus any bonus that has already been paid into the account. A bonus you have not yet received is not wealth you possess, so it is not counted. Likewise, money you cannot freely access without a penalty is still yours — so it still counts; restricted access does not remove ownership.
Omar, 29, in Manchester, saving for his first home, has a Stocks & Shares LISA. On his zakat anniversary the platform shows:
- His own contributions to date: £8,000
- Government bonuses already paid in and invested: £2,000
- Investment growth on the whole pot: £600
- A bonus on his most recent £4,000 contribution that HMRC has not yet paid: ~£1,000 (excluded)
Zakatable LISA value = £8,000 + £2,000 + £600 = £10,600. The unpaid future bonus is not yet his, so it is left out.
Omar holds for the long term, so he applies the 25% proxy: £10,600 × 0.625% = £66.25. (Full-value basis would be £10,600 × 2.5% = £265.)
One caution: the LISA carries a 25% withdrawal charge if you take money out for an unauthorised reason, which gov.uk confirms recovers the government bonus (and can claw back a slice of your own contribution too). That doesn't change the zakat calculation — you still own the balance — but it's a reason not to pay zakat by raiding the LISA itself.
- Tax-free ≠ zakat-free. The ISA wrapper shelters you from HMRC, not from zakat. The full balance counts.
- The rate is 2.5% of your zakatable wealth, once you exceed nisab (most UK scholars use the silver value, the lower threshold) and have held it a full lunar year.
- Use the value on your zakat anniversary — for an S&S ISA that's the market value that day, not what you paid in.
- Long-term holders may use a proxy — 25% (effective 0.625%) per NZF, or 30% per some scholars. Traders pay on full value.
- LISA: count deposits + growth + bonuses already paid in. Exclude any bonus HMRC hasn't paid yet — you don't own it. Restricted access doesn't remove ownership.
Frequently asked questions
Does my ISA being tax-free mean I don't pay zakat on it?
No. Tax-free status is a UK tax rule that exempts the wrapper's returns from Income Tax and Capital Gains Tax. Zakat is governed by the Sharia, which makes wealth zakatable based on ownership and the lunar year — not on how HMRC taxes it. The full ISA balance counts at 2.5%.
How do I value a Stocks & Shares ISA for zakat?
Take the current market value shown on your platform on your zakat anniversary date — not the amount you contributed. Apply 2.5% to the full value, or use the 25%/30% long-term proxy if you are a genuine buy-and-hold investor.
What is the 25% proxy and who can use it?
Long-term share investors only pay zakat on a company's zakatable assets (cash, stock, receivables), not its fixed assets. Because the exact split is hard to know, the National Zakat Foundation recommends assuming 25% of market value is zakatable and applying 2.5% to that — an effective rate of 0.625%. Short-term traders pay on the full value.
Do I count the Lifetime ISA government bonus in my zakat?
Count only the bonus already paid into your account, plus your deposits and any growth. A bonus HMRC has not yet paid is not wealth you possess, so it is excluded. The future 25% bonus only becomes zakatable once it lands in the account.
I can't withdraw my LISA without a 25% penalty — does it still count for zakat?
Yes. Restricted or penalised access does not remove your ownership of the money, so the balance remains zakatable. The withdrawal charge is a separate matter; don't fund your zakat by triggering it — pay from other wealth instead.
What if my Cash ISA pays interest?
Conventional interest (riba) is not lawful wealth for you to keep or benefit from. Give it away to charity separately, in addition to your zakat. The principal balance of the Cash ISA is still zakatable at 2.5%. A Sharia-compliant provider paying an expected profit rate avoids the issue.
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