Investing in property remains one of the most common ways to build long-term wealth in the UK — but the landscape for landlords has changed dramatically since 2015. Higher stamp duty, Section 24 mortgage interest restrictions, and tighter EPC requirements mean you need to run the numbers carefully. Here is everything you need to know before buying your first investment property.
Before committing, model the numbers honestly. A property that looks attractive at first glance can easily turn negative once you account for stamp duty, mortgage costs, voids, maintenance and tax.
| Item | Example (£250k property, £1,100/mo rent) |
|---|---|
| Gross annual rent | £13,200 |
| Letting agent (12%) | −£1,584 |
| Insurance | −£300 |
| Repairs / maintenance (1% of value) | −£2,500 |
| Void allowance (3 weeks) | −£635 |
| Mortgage interest (2.5%, £187.5k loan) | −£4,688 |
| Gross profit before tax | £3,493 |
| Section 24 credit (20% of £4,688) | +£938 |
| Taxable income (HR landlord, 40%) | £3,493 × 40% = £1,397 tax |
| Net profit (after tax credit) | £3,493 − £1,397 + £938 = £3,034 |
| Net yield on deposit (£62,500) | ~4.9% |
Illustrative only. Use the buy-to-let calculator for your own scenario.
Buy-to-let mortgages work differently from residential mortgages. Lenders assess affordability primarily on the rental income rather than your salary, using an interest coverage ratio (ICR) test.
Since 31 October 2024, buy-to-let properties in England and Northern Ireland attract an additional 5% SDLT surcharge on every band. This applies if you already own a residential property and are buying another. You can reclaim it if you sell your main residence within 36 months.
| Property value (England) | Standard SDLT | +5% surcharge | Total BTL SDLT |
|---|---|---|---|
| £150,000 | £500 | £7,500 | £8,000 |
| £200,000 | £1,500 | £10,000 | £11,500 |
| £250,000 | £2,500 | £12,500 | £15,000 |
| £300,000 | £5,000 | £15,000 | £20,000 |
| £400,000 | £10,000 | £20,000 | £30,000 |
| £500,000 | £15,000 | £25,000 | £40,000 |
Rates from 1 April 2025 (residential nil-rate threshold reverts to £125,000). Scotland: LBTT + 8% ADS. Wales: LTT + 4% surcharge. Use the stamp duty calculator.
Rental income is added to your other income and taxed at your marginal rate. The big change since 2020 is Section 24: individual landlords can no longer deduct mortgage interest as an expense. Instead, you receive a 20% basic-rate tax credit on your finance costs.
| Tax rate | £10,000 interest — old system | £10,000 interest — Section 24 | Extra tax per year |
|---|---|---|---|
| Basic rate (20%) | £2,000 saved (deduction) | £2,000 credit (same) | £0 |
| Higher rate (40%) | £4,000 saved (deduction) | £2,000 credit | +£2,000 |
| Additional rate (45%) | £4,500 saved (deduction) | £2,000 credit | +£2,500 |
Yield is the return on your property investment, expressed as a percentage. You need to compare this against the cost of mortgage debt and alternative investments.
Yield formulas:
| UK region | Average gross yield 2025 | Capital growth potential |
|---|---|---|
| London (prime) | 2.5–3.5% | High long-term |
| London (outer zones) | 3.5–4.5% | Moderate–high |
| South East / Bristol | 4–5% | Moderate |
| Midlands / East Midlands | 5–6.5% | Moderate |
| North West (Manchester/Liverpool) | 6–8% | Growing |
| Yorkshire & Humber | 6–7.5% | Moderate |
| Scotland (Glasgow/Edinburgh) | 5.5–7% | Moderate–high |
| Wales | 5–6.5% | Lower |
Being a landlord in England (rules vary in Scotland, Wales and NI) carries significant legal duties. Non-compliance can result in fines, rent repayment orders, or prohibition from letting.
From 2025, landlords in England will need to be registered on the new Private Rented Sector Database (Renters’ Rights Act 2024). Mandatory landlord licensing schemes already operate in many local authority areas (check your council).
This is the biggest strategic decision for new landlords. The right answer depends on your tax position, portfolio size, and long-term exit strategy.
| Factor | Personal name | Limited company |
|---|---|---|
| Mortgage interest deduction | Only 20% credit (Section 24) | Full deduction ✓ |
| Tax on profits | 20/40/45% Income Tax | 19/25% Corporation Tax |
| CGT on sale | 18/24% (residential) | 25% CT then dividend/salary to extract |
| Mortgage rates | Standard BTL rates | Typically 0.5–1% higher |
| Admin burden | Self Assessment | Annual accounts + CT return + confirmation |
| Inheritance planning | Complex (IHT) | Shares easier to gift (potentially) |
| Best for | 1–2 properties, basic-rate taxpayer | 3+ properties, higher-rate taxpayer |