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Stamp Duty Land Tax (SDLT) is one of the largest upfront costs when purchasing an HMO — and for most HMO investors, the bill is significantly higher than a standard homebuyer would pay on the same property. The 5% additional property surcharge, introduced in 2016 and increased from 3% in October 2024, applies to almost every HMO purchase because the buyer typically already owns at least one other property.
This guide covers every stamp duty consideration specific to HMO investors, including the additional property surcharge, limited company purchase rules, regional variations, and worked examples at common purchase prices. For guidance on the mortgage side of purchasing, see our HMO mortgages guide.
How Much Stamp Duty Do You Pay on an HMO?
The short answer: the standard SDLT rates plus a 5% surcharge on every band, because you're buying an additional property. For a £300,000 HMO purchase, that means a stamp duty bill of approximately £19,500 — compared with £2,500 for a first-time homebuyer purchasing the same property.
The surcharge applies whether you're buying the HMO in your personal name or through a limited company. There's no exemption for investors, no first-time landlord relief, and no way to avoid it if you already own another property.
Use our HMO stamp duty calculator to get an instant calculation for your specific purchase price.
For more on this topic, see our guide to HMO Insurance: What Cover Do You Need as an HMO Landlord?.
Current SDLT Rates for Residential Property (2026)
The standard SDLT rates for residential property in England and Northern Ireland are:
| Purchase Price Band | Standard Rate | Additional Property Rate (+5%) |
|---|---|---|
| Up to £125,000 | 0% | 5% |
| £125,001 – £250,000 | 2% | 7% |
| £250,001 – £925,000 | 5% | 10% |
| £925,001 – £1,500,000 | 10% | 15% |
| Over £1,500,000 | 12% | 17% |
These rates are applied on a sliding scale — you only pay the higher rate on the portion of the purchase price within each band, not on the entire amount. The additional property rates apply to HMO purchases where the buyer already owns another residential property.
Note: SDLT thresholds reverted to these levels from 1 April 2025 after the temporary higher thresholds (£250,000 nil-rate band) expired. Ensure you're using the correct rates for your completion date.
The 5% Additional Property Surcharge — Why HMO Investors Almost Always Pay It
The additional property surcharge applies when the buyer:
- Already owns one or more residential properties (anywhere in the world), AND
- Is not replacing their main residence
Since HMO investors are, by definition, buying an investment property — and typically already own at least their own home plus potentially other rental properties — the surcharge applies to virtually every HMO purchase.
Key Details
- The surcharge was increased from 3% to 5% for transactions completing on or after 31 October 2024
- It applies to the entire purchase price (each band is increased by 5 percentage points)
- It applies regardless of whether the HMO is purchased in a personal name or through a company
- It applies even if you're buying your first investment property, provided you already own a main residence
- Married couples and civil partners are treated as one unit — if either partner owns another property, the surcharge applies
Can You Avoid the Additional Property Surcharge?
In practice, very rarely. The only scenario where an HMO purchase wouldn't attract the surcharge is if the buyer owns no other residential property at all — for example, a first-time buyer purchasing an HMO as their only property and living in one of the rooms. This is an unusual arrangement and may affect mortgage eligibility.
Stamp Duty for Limited Company HMO Purchases
Buying an HMO through a limited company triggers the same 5% additional property surcharge as a personal purchase. Companies are automatically treated as purchasing additional properties — there's no "main residence" concept for a corporate body.
Corporate Body Surcharge
Prior to October 2024, companies purchasing residential property over £500,000 faced an additional 15% flat-rate SDLT charge (the Annual Tax on Enveloped Dwellings regime). However, this 15% rate applies to properties held for personal use by connected persons, not to genuine investment properties let to unconnected tenants. HMOs let to individual tenants on ASTs are excluded from this charge.
For most HMO purchases through a limited company, the applicable rate is the standard residential rate plus the 5% additional property surcharge — the same as a personal purchase.
For more on company purchase structures, see our limited company HMO mortgage guide.
Non-UK Resident Surcharge
According to GOV.UK guidance on the non-UK resident surcharge, if the buyer is not UK-resident, an additional 2% surcharge applies on top of the standard rates and the additional property surcharge. This means non-UK resident HMO investors pay the standard rate plus 5% (additional property) plus 2% (non-resident), for a total surcharge of 7% on every band.
A purchaser is treated as non-UK resident if they have not been present in the UK for at least 183 days in the 12 months before completion. This applies to individuals and to companies controlled by non-UK residents.
Multiple Dwellings Relief — What Happened and Does It Still Apply?
Multiple Dwellings Relief (MDR) was abolished for transactions completing on or after 1 June 2024. Before abolition, MDR allowed buyers purchasing two or more dwellings in a single transaction to pay SDLT based on the average price per dwelling, which could significantly reduce the bill for HMO purchases.
Does MDR Still Apply to Any HMO Purchases?
Only in very limited transitional cases. If you exchanged contracts before 6 March 2024 and completed after 1 June 2024, transitional provisions may preserve your MDR claim. For any new HMO purchase in 2026, MDR is no longer available.
This abolition removed a valuable tax planning tool for HMO investors, particularly those purchasing properties with self-contained units.
The 6+ Property Rule — When Commercial Rates Apply
When a buyer purchases six or more residential properties in a single transaction, they can choose to apply the non-residential (commercial) SDLT rates instead of residential rates.
Non-Residential SDLT Rates
| Purchase Price Band | Rate |
|---|---|
| Up to £150,000 | 0% |
| £150,001 – £250,000 | 2% |
| Over £250,000 | 5% |
The commercial rates do not attract the 5% additional property surcharge, which can make them significantly cheaper for portfolio purchases. However, this only applies when purchasing six or more properties in a single linked transaction — it doesn't help when buying a single HMO.
For more on this topic, see our guide to Optimizing for the Future.
When Might This Apply to HMO Investors?
- Buying a portfolio of HMO properties in one transaction
- Purchasing a property containing six or more self-contained flats (treated as six separate dwellings)
- Acquiring a mixed-use property (residential and commercial elements)
For most individual HMO purchases, this rule doesn't apply. But for portfolio investors or those acquiring multi-unit freehold blocks, it's worth investigating with your solicitor.
Stamp Duty on Transferring an HMO into a Limited Company
Transferring an existing HMO from personal name to a limited company is treated as a sale for SDLT purposes, even if no money changes hands. SDLT is calculated on the market value of the property at the time of transfer.
For more on this topic, see our guide to HMO Market Trends Post-COVID.
Key Considerations
- The company will pay SDLT at the additional property rate (standard rates + 5% surcharge)
- The market value determines the SDLT bill, not the original purchase price
- Capital Gains Tax may also be triggered on the transfer (see our HMO tax guide for details)
- If multiple properties are transferred simultaneously, the 6+ property rule may apply
Worked Example
Transferring a single HMO valued at £350,000 into a limited company:
| Band | Value in Band | Rate (incl. 5% surcharge) | Tax |
|---|---|---|---|
| £0 – £125,000 | £125,000 | 5% | £6,250 |
| £125,001 – £250,000 | £125,000 | 7% | £8,750 |
| £250,001 – £350,000 | £100,000 | 10% | £10,000 |
| Total SDLT | £25,000 |
This SDLT cost — plus CGT on any gain, legal fees, and a new mortgage arrangement — means transferring properties into a company only makes financial sense if the ongoing tax savings outweigh the upfront costs over your investment time horizon.
Stamp Duty Worked Examples for HMO Purchases
£200,000 HMO Purchase (Additional Property)
| Band | Value in Band | Rate | Tax |
|---|---|---|---|
| £0 – £125,000 | £125,000 | 5% | £6,250 |
| £125,001 – £200,000 | £75,000 | 7% | £5,250 |
| Total SDLT | £11,500 |
£350,000 HMO Purchase (Additional Property)
| Band | Value in Band | Rate | Tax |
|---|---|---|---|
| £0 – £125,000 | £125,000 | 5% | £6,250 |
| £125,001 – £250,000 | £125,000 | 7% | £8,750 |
| £250,001 – £350,000 | £100,000 | 10% | £10,000 |
| Total SDLT | £25,000 |
£500,000 HMO Purchase (Additional Property)
| Band | Value in Band | Rate | Tax |
|---|---|---|---|
| £0 – £125,000 | £125,000 | 5% | £6,250 |
| £125,001 – £250,000 | £125,000 | 7% | £8,750 |
| £250,001 – £500,000 | £250,000 | 10% | £25,000 |
| Total SDLT | £40,000 |
These figures should be factored into your acquisition costs when modelling HMO investment returns. Use our HMO mortgage calculators to see how stamp duty affects your overall return, and get a free HMO mortgage quote to understand your financing options.
Stamp Duty in Scotland (LBTT) and Wales (LTT) for HMO Investors
Scotland — Land and Buildings Transaction Tax (LBTT)
Scotland has its own property transaction tax with different rates and bands. According to Revenue Scotland, the Additional Dwelling Supplement (ADS) is currently 8% (increased from 6% in December 2024) — significantly higher than the English surcharge.
| Purchase Price Band | Standard Rate | Additional Dwelling Rate (+8%) |
|---|---|---|
| Up to £145,000 | 0% | 8% |
| £145,001 – £250,000 | 2% | 10% |
| £250,001 – £325,000 | 5% | 13% |
| £325,001 – £750,000 | 10% | 18% |
| Over £750,000 | 12% | 20% |
Scottish HMO investors face higher upfront costs than those purchasing in England. A £350,000 HMO purchase in Scotland with ADS costs approximately £38,350 — compared with £25,000 in England.
Wales — Land Transaction Tax (LTT)
According to the Welsh Revenue Authority, Wales has its own system with a higher property rate for additional purchases:
| Purchase Price Band | Standard Rate | Higher Rate (+6%) |
|---|---|---|
| Up to £225,000 | 0% | 6% |
| £225,001 – £400,000 | 6% | 12% |
| £400,001 – £750,000 | 7.5% | 13.5% |
| £750,001 – £1,500,000 | 10% | 16% |
| Over £1,500,000 | 12% | 18% |
The Welsh higher rate surcharge is 6%, sitting between England's 5% and Scotland's 8%.
Can You Reduce Stamp Duty on an HMO Purchase?
Legitimate stamp duty reduction options for HMO investors are limited, but worth understanding:
1. Purchase Through Auction at Below Market Value
SDLT is calculated on the price actually paid, not the market value (unlike transfers to connected parties). Purchasing below market value — at auction, from a motivated seller, or through off-market deals — directly reduces your stamp duty bill.
2. Negotiate to Exclude Fixtures and Fittings
Items that are not fixtures (furniture, white goods, curtains, carpets) can be excluded from the property price and purchased separately. This legitimately reduces the amount subject to SDLT. The amount must be realistic and defensible — HMRC will challenge inflated claims.
3. Timing of Purchase
If you're selling your main residence and buying an HMO, completing the sale of your main residence before purchasing the HMO may allow you to claim a refund of the additional property surcharge, provided the sale completes within 36 months.
4. Mixed-Use Classification
If the property has genuine commercial elements (e.g., a ground-floor shop with residential above), it may qualify for non-residential SDLT rates, which are lower and don't attract the additional property surcharge. This is property-specific and requires professional advice.
For the broader financial context of buying an HMO, see our buying an HMO property guide and the HMO property investment guide.
Sources
- GOV.UK — Stamp Duty Land Tax
- GOV.UK — SDLT residential property rates
- GOV.UK — Higher rates for additional properties
- GOV.UK — Non-residential and mixed-use SDLT rates
- GOV.UK — SDLT surcharge for non-UK residents
- GOV.UK — SDLT relief for land or property transactions (MDR)
- GOV.UK — SDLT transfers between connected parties
- Revenue Scotland — Land and Buildings Transaction Tax (LBTT)
- Welsh Revenue Authority — Land Transaction Tax rates and bands
FAQs
Do I always pay the additional property surcharge when buying an HMO?
Almost always, yes. The surcharge applies if you own any other residential property at the time of purchase. Since most HMO investors own at least their own home, the 5% surcharge applies to virtually every HMO purchase. The only exception is if you own no other residential property — which is rare for investment purchases.
Is stamp duty higher if I buy an HMO through a limited company?
The SDLT rates are the same whether you buy in a personal name or through a limited company. Both attract the 5% additional property surcharge on residential purchases. The only difference arises for properties over £500,000 held for personal use (the 15% ATED rate), which doesn't apply to genuine HMO investments let to tenants.
For more on this topic, see our guide to How Interest Rates Affect HMO Investments.
Can I claim stamp duty as an expense against rental income?
No. SDLT is a capital cost of acquiring the property, not a revenue expense. It cannot be deducted from rental income for income tax purposes. However, it is added to your acquisition cost base, which reduces your capital gain (and therefore your CGT bill) when you eventually sell the property.
How much stamp duty will I pay on a £300,000 HMO purchase?
For an additional property purchase in England at £300,000: £125,000 at 5% (£6,250) + £125,000 at 7% (£8,750) + £50,000 at 10% (£5,000) = £20,000 total SDLT. Use our stamp duty calculator for instant calculations at any purchase price.
Is there a stamp duty exemption for first-time HMO investors?
No. There is no first-time investor or first-time landlord exemption from SDLT. First-time buyer relief only applies to individuals purchasing their first main residence — it cannot be used for investment property purchases, including find out more. If you already own your home, you'll pay the additional property surcharge on your first HMO purchase.