The ISA is Britain's best savings perk: profit earned inside the wrapper is tax-free, year after year. Nothing about the wrapper conflicts with Islamic law, since it is a tax status rather than a product structure. The constraint is supply. Across every provider we track, exactly one offers Shariah compliant Cash ISAs: Gatehouse Bank. This guide covers what it offers, how the expected profit mechanics interact with the tax wrapper, and how to judge a tax-free 4.35% against the taxable 4.81% at the top of our fixed term table. Rates verified August 6, 2026.
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The full halal Cash ISA shelf
| Product | Rate | Minimum | Term |
|---|---|---|---|
| Gatehouse Fixed Term Woodland Cash ISA, 1 year | 4.35% AER expected, tax-free | 1,000 GBP | 1 year fixed |
| Gatehouse Fixed Term Woodland Cash ISA, 18 months to 5 years | 3.60% AER expected, tax-free | 1,000 GBP | 18 months to 5 years |
| Gatehouse Easy Access Cash ISA | 2.95% AER expected, tax-free | 1 GBP | Instant access |
That is the entire published market in our database. Al Rayan's open savings shelf runs fixed term deposits and an instant access saver but no ISA; BLME, QIB (UK) and HBZ Sirat likewise offer none. If you want a halal Cash ISA in 2026, you are choosing between Gatehouse products, which at least makes the comparison simple. Gatehouse is a PRA-authorised wholly Islamic bank with FSCS protection to 120,000 GBP, a named three-scholar Shariah board chaired by Sheikh Dr Nizam Yaquby, and downloadable compliance certificates for its savings family. The Woodland branding is real: the bank plants a tree in certified UK woodland for each fixed term account opened or renewed.
How a halal ISA works under the hood
Identically to Gatehouse's ordinary savings, plus the wrapper. Your deposit joins the bank's pool of ethical, Shariah compliant investments and earns an expected profit rate; Gatehouse states it has always delivered its expected rates and would offer an exit if it anticipated falling short. HMRC's wrapper does not care whether the return is called interest or profit; inside an ISA it accrues tax-free, and outside one it counts toward your Personal Savings Allowance. So the religious analysis of a Gatehouse ISA is the same as for its taxable twins, with the same board and certificates behind it.
The maths: 4.35% tax-free vs 4.81% taxable
At our verification, the best taxable halal one-year rate was HBZ Sirat's 4.81% eDeposit, against Gatehouse's 4.35% inside the ISA. Whether the wrapper wins depends on whether the profit would actually be taxed. Savings income above your Personal Savings Allowance is taxed at your marginal rate. A basic rate taxpayer keeping 80% of taxed profit turns 4.81% into an effective 3.85% on the taxed slice; a higher rate taxpayer keeping 60% turns it into 2.89%. Against a clean 4.35%, the ISA wins comfortably for anyone whose allowance is already used up, and loses only for savers whose total profit stays inside their allowance, who genuinely have no tax to shelter.
The easy access comparison is even cleaner because there is no sacrifice at all: Gatehouse pays 2.95% on its taxable easy access account and the same 2.95% inside the easy access Cash ISA, from 1 GBP either way. If you qualify to open an ISA and have allowance remaining, taking the taxable version amounts to volunteering for tax.
Fixed term ISA quirks worth knowing
Gatehouse's fixed term ISA carries a disclosed early-exit price, which its product materials describe, so unlike a raw fixed term deposit you are not absolutely locked; you pay a defined cost to leave. The rate step is sharp: 4.35% at one year drops to 3.60% for every term from 18 months to five years, so the one-year fix was clearly the sweet spot at our crawl date, and rolling one-year ISAs looked better on paper than locking 3.60% for five years unless you specifically expect rates to fall hard and stay down. We do not forecast rates; we just note what the published curve implies.
The near-miss: Algbra's Cubes and the allowance
One product deserves a mention precisely because it is not an ISA. Algbra's Ethical Saver Cubes are fixed term Murabaha savings executed by Standard Chartered, FSCS-protected while locked, with rates shown in-app. Algbra's own documentation notes Cube profit counts toward your Personal Savings Allowance, which is the tell: no wrapper. A saver choosing between a Cube and the Gatehouse fixed term ISA at a similar rate should remember that the ISA's profit stays tax-free forever and the allowance renews annually, while Cube profit competes with every other taxable pound of savings income you earn that year. The Cubes' genuine advantage is contractual fixed profit under a disclosed Murabaha sale, which some savers prefer religiously to an expected rate. Tax efficiency and contract certainty are different axes; you get to pick one per pound.
What about Stocks and Shares ISAs?
This guide covers cash. If your horizon is five years or more, a Shariah compliant Stocks and Shares ISA holds screened equity funds inside the same tax wrapper; Wahed Invest offers one in the UK among others. Different risk class entirely: capital is not protected the way an FSCS deposit is, and values move. Our investing hub covers the halal fund and ISA choices; the sensible split for most households is cash ISA for near-term money, stocks ISA for long-term money.
How to use the allowance well
- Fill the ISA before taxable deposits if your Personal Savings Allowance is already consumed by other profit or interest.
- Use the easy access Cash ISA as the default emergency fund home: same 2.95% as taxable, from 1 GBP, with the wrapper preserved for future years.
- For lump sums you can lock, compare the one-year ISA at 4.35% against your after-tax return on the best taxable fix; for most taxpayers the ISA wins.
- Remember transfers: moving an existing conventional Cash ISA into Gatehouse keeps the wrapper intact. Follow the ISA transfer process rather than withdrawing, or the money loses its protected status.
- Watch the annual allowance across all ISA types you fund in the tax year.
Frequently asked questions
Is the ISA wrapper itself halal?
The wrapper is a tax exemption, not a financial structure, and it contains whatever product you put in it. A Gatehouse Cash ISA contains the bank's Shariah board-approved expected profit savings; the tax-free status changes what HMRC takes, not what the money does. No scholar objection to the wrapper appears anywhere in our research.
Can I transfer my existing Cash ISA from a conventional bank?
Gatehouse's ISA range operates within the standard ISA transfer system. The one rule that matters: initiate a formal transfer through the receiving provider rather than withdrawing the money yourself, because cash that leaves the wrapper cannot re-enter beyond your current-year allowance.
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.
Why do the other Islamic banks not offer ISAs?
None of them publishes a reason, and we will not invent one. The observable fact is that Al Rayan, BLME, QIB (UK) and HBZ Sirat listed no Cash ISA at our August 6, 2026 verification, leaving Gatehouse alone in the category. If that changes, our bank accounts hub will reflect it.