Ask a committed Meezan customer about Islamic windows and you may hear that halal banking inside a conventional bank is like a halal counter inside a liquor store. Ask an HBL Islamic depositor and you will hear that their pool is segregated, their Shariah board is real, and their rate sheet is signed by a named scholar every month. Both are describing true things. Whether the difference matters for your money depends on what you are protecting: the contract, or the institution behind it.
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What each one actually is
A full-fledged Islamic bank holds a dedicated SBP Islamic banking licence and has no conventional book at all: Meezan, BankIslami, Faysal (post-conversion), Dubai Islamic Bank Pakistan, Al Baraka, MCB Islamic and now Raqami. An Islamic window is a conventional bank's segregated Islamic operation, with dedicated branches, its own deposit pools, its own Shariah board and its own monthly profit declarations. The windows include some of the largest Islamic operations in the country: HBL Islamic's published lists show 274 Islamic branches plus 810 windows, and UBL Ameen's show roughly 752 branches plus 596 windows.
The case that it doesn't matter: the contract is the contract
Your Mudarabah savings account at a window is governed by the same SBP Shariah Governance Framework as one at a full-fledged bank. The pool is segregated and can only finance Shariah-compliant assets. The weightages are published before each month. The declaration is signed off under a Shariah board; at HBL Islamic, the resident Shariah board member personally signs the monthly profit-rate declaration. The scholars are frequently the same people: Dr. Mufti Khalil Aazami chairs Bank Alfalah's window board and sits on full-fledged Faysal's; Mufti Irshad Ahmad Aijaz chairs full-fledged BankIslami's board and the SBP's own Shariah committee. Nobody serious argues that window deposits are haram; the structures are certified by the same scholarly community that certifies the full banks.
Some windows also out-disclose full-fledged banks. Allied Aitebar publishes its Profit Equalization Reserve and Investment Risk Reserve policies, which most full banks do not. HabibMetro Sirat publishes dedicated bilingual fatwas for every product family. If disclosure quality is your yardstick, the best windows beat the average Islamic bank.
The case that it does: what your relationship feeds
The principled objection is not about your account; it is about the institution. A conventional bank with a window still runs an interest-based lending book, a conventional treasury and a conventional profit engine. Your deposit sits in the Islamic pool, but your custom, your fees and the deposit franchise you help build all strengthen a bank whose core business is riba. Some scholars and many savers find that unacceptable regardless of pool segregation. Others accept the window model precisely because it moves conventional banks toward Islamic operations branch by branch; UBL has been converting conventional branches to Ameen branches at scale, and windows are how most Pakistani banks began journeys that ended in full conversion, Faysal being the proof.
There is also a practical edge case: hybrids and converts. Mashreq Bank Pakistan brands itself Islamic-first, yet publishes both Islamic and conventional rate sheets, making it structurally a window despite the branding. Bank Makramah, mid-conversion, published a June 2026 rate sheet with Islamic savings at about 8.14% alongside legacy conventional accounts at 0.11-0.25%. Dual books during conversion are normal, but they show why 'Islamic bank' on a billboard deserves a second look at the schedule of charges.
A practical decision rule
If your priority is that no rupee of your relationship touches a conventional balance sheet, choose a full-fledged Islamic bank and be done with it. Meezan, BankIslami and Faysal give you scale, branch networks and published fatwa libraries. If your priority is contract validity plus convenience, a strong window is legitimate and sometimes better run: check that it names its Shariah board, publishes monthly declared rates and weightages in readable form, and maintains dedicated Islamic branches rather than a counter and a logo. Judge the specific operation, not the category. We track both types side by side on HalalWallet's bank accounts page.
Frequently asked questions
Is money deposited in an Islamic window halal?
The deposit contracts at SBP-regulated Islamic windows are certified by their Shariah boards and follow the same Mudarabah and Qard structures as full-fledged banks, with segregated pools. Mainstream scholarly opinion accepts them. Some savers still prefer full-fledged banks so their overall banking relationship avoids conventional institutions entirely; that is a legitimate personal standard, not a fiqh requirement.
Can a window's Islamic pool mix with the conventional book?
No. Under the SBP's framework, Islamic banking funds are segregated, invested only in Shariah-compliant assets, and accounted for in separate pools with their own weightages and declarations. The window's Shariah board and the bank's Shariah compliance function exist to police exactly this boundary.
Do windows pay better or worse rates than full Islamic banks?
Neither, systematically. In June 2026 declarations, window operations like HabibMetro Sirat (8.48%) and Bank AL Habib (8.00%) beat full-fledged BankIslami (7.84%) and Meezan (7.04% on Rupee Savings), while the full-fledged digital entrant Raqami beat everyone at 10-11%. The pool's assets and the bank's pricing strategy set the rate, not the licence type.
Which windows are the largest in Pakistan?
By published branch lists: UBL Ameen (roughly 752 Islamic branches plus 596 windows after absorbing Silkbank's Emaan), HBL Islamic (274 branches plus 810 windows), and Bank Alfalah Islamic (around 453 dedicated branches, a window since 2003). HabibMetro Sirat listed 311 Islamic banking windows as of May 2026.
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Will the windows eventually convert fully?
Several institutions are already converting: Bank of Khyber initiated full conversion in February 2025, U Microfinance Bank began a bank-wide conversion in 2025, and Faysal completed the largest such transformation. Pakistan's policy direction favours more conversion, but each bank moves on its own timetable and no window's conversion should be assumed until its board announces it.