HMO Deposit & Mortgage Cheat Sheet for 2026 (Save This)

The Deposit Floor: What HMO Lenders Actually Require

Start here, because this is where most people get it wrong.

The standard minimum deposit for an HMO mortgage in 2026 is 25% — that's a 75% loan-to-value (LTV) ceiling for most residential HMO lenders. Not 20%. Not 10%. Twenty-five percent, minimum, and that's before anyone looks at your credit file or rental income projections.

Sui Generis properties — that's anything with seven or more lettable bedrooms, which requires full planning permission rather than an HMO licence — typically push that floor up to 30% or higher. Lenders treat them as commercial-adjacent assets, and the underwriting reflects that. If you're eyeing a large Victorian conversion with eight rooms, model 30% deposit from day one.

And here's the part most guides skip: the best rates don't kick in at 75% LTV. They kick in at 65% LTV — meaning a 35% deposit. According to data published by Quartico in April 2026, HMO investors who put down 35% access materially better pricing tiers. Fleet Mortgages, for example, was quoting a five-year fixed HMO rate of 5.39% as of the week ending 5 June 2026 (reported by Mortgage Introducer). That kind of rate doesn't appear at 75% LTV.

So your deposit planning shouldn't just ask "what's the minimum?" — it should ask "what LTV gets me to a rate that makes the deal stack?"

Limited Company vs Personal Name: The 80% Shift You Can't Ignore

This is the decision that has the biggest long-term impact on your HMO portfolio — and the market has already voted.

Around 80% of new buy-to-let and HMO purchases in the UK now go through a limited company structure, according to Quartico's April 2026 analysis. That figure has been climbing steadily since Section 24 phased out mortgage interest relief for personal-name landlords between 2017 and 2020. Under Section 24, if you own property personally, you can no longer deduct mortgage interest from rental income before calculating your tax bill. You get a basic-rate tax credit instead — which means higher-rate taxpayers are effectively taxed on turnover, not profit.

A limited company (typically a Special Purpose Vehicle, or SPV) sidesteps this entirely. The company pays corporation tax — currently 19% on profits up to £50,000, rising to 25% above £250,000 — and can deduct 100% of mortgage interest as a business expense. Compare that to 40–45% income tax on personal-name rental profit, and the maths becomes hard to argue with.

The trade-off? Mortgage product choice narrows slightly for limited companies, rates can be fractionally higher on some products, and you'll need an accountant who understands SPV structuring (which isn't every accountant). There's also the cost of incorporation and annual filing. But for any investor planning to hold more than one or two properties, the tax efficiency of the SPV route almost always wins. I'd strongly recommend speaking with a qualified accountant before deciding — but the direction of travel in this market is clear.

One more thing: if you already own properties personally and are considering transferring them to a company, be aware that this can trigger a stamp duty liability and capital gains tax event. It's not always the right move for existing portfolios. That's exactly the kind of equity-freeing conversation where a specialist broker earns their fee.

First-Time HMO Landlords: Why the Criteria Are Stricter Than You Think

Here's something the generic mortgage comparison sites don't tell you: being a first-time HMO landlord is a distinct underwriting category, and it's a harder one.

Many HMO-specialist lenders require evidence of prior landlord experience — sometimes as a minimum of one to two years as a residential BTL landlord — before they'll consider your HMO application. The logic is straightforward from their perspective: HMOs are operationally more complex than single-lets, tenant turnover is higher, and the licensing requirements add a layer of compliance risk. Lenders price that risk by restricting access.

This doesn't mean you're locked out. It means the pool of lenders willing to work with you is smaller, and you need someone who knows which lenders sit in that pool. A specialist HMO broker doesn't just find you a rate — they map your profile against lender criteria before you apply, saving you hard searches on your credit file and wasted months.

The ICR (Interest Cover Ratio) stress test is the other hurdle. Most lenders stress-test HMO mortgages at 125%–145% ICR, meaning the rental income must cover 125–145% of the mortgage payment at a notional stress rate (often 5.5%–6%). For HMOs, the rental income calculation can work in your favour — room-by-room rents often produce higher gross yields than equivalent single-lets — but only if the lender accepts the projected income figure. Some lenders apply a haircut to HMO rental income projections. Others accept ARLA or RICS-supported valuations. Knowing which lender does which is the difference between a deal that works and one that doesn't.

Freeing Equity From an Existing Portfolio: The Problem Nobody Talks About Enough

Getting the first mortgage is one challenge. Getting equity out of a portfolio you've already built is a different one — and in my experience, it catches experienced landlords off guard more often than first-timers.

Refmortgage lenders apply stress tests on remortgage applications just as they do on purchases. If rates have risen since your original deal (and for most landlords who fixed pre-2022, they have), your ICR on a new deal may not pass at the same LTV you originally borrowed at. You might find yourself sitting on significant paper equity — a property worth £350,000 with a £150,000 mortgage — but unable to extract it because the rental income doesn't satisfy the stress test at the new rate environment.

This is where a specialist broker who understands portfolio underwriting is genuinely valuable. Some lenders will assess your entire portfolio on a combined basis rather than property by property — which can work in your favour if some properties are unencumbered or low-LTV. Others have specific remortgage products designed for portfolio landlords (defined by the PRA as those with four or more mortgaged properties). The product landscape here is genuinely complex, and it changes.

If you're sitting on equity you can't seem to access, the answer isn't usually "wait." It's usually "talk to someone who does this every day." ZARSK's regulated finance partners specialise in exactly this — both new HMO purchases and portfolio equity release — and they've been doing it for over a decade. You can get matched at [zarsk.co.uk/finance-property](https://www.zarsk.co.uk/finance-property).

The deposit question is the wrong starting question. The right question is: what LTV makes this deal viable, what structure minimises my tax exposure over ten years, and which lenders will actually look at my profile? Get those three right and the deposit number follows. Get them wrong and no amount of deposit will save a deal that was never going to stack.