Property Investment
Buy-to-let fundamentals, SDLT surcharges, Section 24 mortgage interest restrictions, rental yield maths, and REITs as a hands-off alternative.
Property Investment
Property holds a special place in British culture — "safe as houses" is a national phrase. But investing in property is more complex than many people realise, especially after the tax changes introduced since 2016.
Buy-to-Let (BTL) Basics
A buy-to-let property is purchased specifically to rent out. The investor earns rental income and hopes for capital growth over time.
Key costs to factor in:
| Cost | Typical Amount |
|---|---|
| Deposit | 25 % of purchase price (BTL mortgages) |
| SDLT | Standard rates + 3 % surcharge |
| Mortgage interest | 5–6 % (2025 rates) |
| Letting agent fees | 8–12 % of rent |
| Maintenance | Budget 10–15 % of rent |
| Insurance | Landlord policy ~£200–400/year |
| Void periods | Expect 1 month/year vacant |
The 3 % SDLT Surcharge
Since April 2016, buying an additional residential property in England & Northern Ireland attracts a 3 % Stamp Duty Land Tax surcharge on top of the standard rates:
| Property Price Band | Standard Rate | BTL Rate (with surcharge) |
|---|---|---|
| Up to £250,000 | 0 % | 3 % |
| £250,001–£925,000 | 5 % | 8 % |
| £925,001–£1,500,000 | 10 % | 13 % |
| Over £1,500,000 | 12 % | 15 % |
A £300,000 BTL purchase incurs SDLT of £11,500 versus £2,500 for a standard purchase — an extra £9,000 at the outset.
Section 24: Mortgage Interest Restriction
Before April 2017, landlords could deduct mortgage interest from rental income before calculating tax. Section 24 phased this out entirely by April 2020.
Now, mortgage interest is only eligible for a basic rate (20 %) tax credit. For higher and additional rate taxpayers, this substantially increases the effective tax bill:
Example: £1,000/month rent, £600/month mortgage interest, 40 % taxpayer
| Before Section 24 | After Section 24 | |
|---|---|---|
| Taxable profit | £400/month | £1,000/month |
| Tax @ 40 % | £160/month | £400/month |
| Less 20 % credit on interest | — | −£120/month |
| Net tax | £160/month | £280/month |
Section 24 has made leveraged BTL significantly less attractive for higher-rate taxpayers.
Calculating Rental Yield
Gross rental yield is the simplest measure:
Gross Yield = (Annual Rent ÷ Property Value) × 100
A property worth £250,000 generating £1,000/month rent has a gross yield of (£12,000 ÷ £250,000) × 100 = 4.8 %.
Net yield subtracts all costs (mortgage, maintenance, voids, insurance, agent fees). Net yields for UK BTL properties typically range from 2–4 % — considerably lower than gross figures suggest.
REITs: Property Without the Hassle
A Real Estate Investment Trust (REIT) is a company that owns and manages income-producing property. REITs are listed on the stock exchange and can be bought inside an ISA or SIPP.
Benefits over direct BTL:
- No SDLT — you buy shares, not property
- No Section 24 — dividends are taxed as income but no mortgage interest restriction
- Instant liquidity — sell your shares in seconds, versus months to sell a house
- Diversification — one REIT may hold hundreds of properties across sectors (retail, industrial, residential, logistics)
- Low entry point — invest from £1 rather than needing a £75,000+ deposit
Examples of UK-listed REITs include British Land, Land Securities, Tritax Big Box (logistics), and Assura (healthcare). REIT index funds like the iShares UK Property ETF (IUKP) offer broad exposure.
Property Within a Portfolio
Property — whether direct or via REITs — provides diversification away from equities and bonds. Historically, UK property has delivered real returns (above inflation) of around 3–5 % per year over the long term, though with significant regional variation.
This module is educational and does not constitute property or tax advice. Tax rules are based on 2025-26 rates for England and may differ in Scotland and Wales.
Explain Like I'm 5
Buying a house to rent out is like buying a treehouse and charging other kids to play in it. You earn pocket money every month, but you also have to fix the roof when it leaks and pay extra fees to the grown-ups. If that sounds like too much work, you can buy a tiny share of a big company that owns loads of treehouses instead, and they do all the fixing for you.
Key Takeaways
- Buy-to-let properties attract a 3 % SDLT surcharge on top of standard Stamp Duty rates, adding significant upfront cost.
- Section 24 restricts mortgage interest relief to a 20 % tax credit, making leveraged BTL less attractive for higher-rate taxpayers.
- Net rental yields in the UK typically range from 2–4 % once all costs are factored in.
- REITs offer property exposure inside an ISA or SIPP without SDLT, Section 24, or the need to be a landlord.
Track your property portfolio alongside all your other assets.
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