Buy-to-let has been one of the most popular routes to building wealth in the UK for decades, and it is easy to see why. Owning a physical asset that generates monthly rent, grows in value over time, and gives you a degree of control that shares never will - on paper it sounds close to ideal. But the landscape has changed. Tax rules have been tightened, costs have crept up, and lenders have become more cautious. What used to look like a straightforward passive income can now feel rather hands-on, and the numbers are harder to make work than they once were. This guide sets out how buy-to-let actually works, what it really costs, how the tax now falls, and whether it is still a sensible choice - or whether alternatives such as REITs make more sense for most people.
None of this is financial advice, and property is a large, illiquid commitment built on assumptions about house prices and rents that nobody can control. Read this as a grounding in how the numbers fit together, then weigh it against your own circumstances.
How buy-to-let works
A buy-to-let mortgage lets you purchase a property specifically to rent it out. You become a landlord, collect monthly rent from tenants, and hope that the rent covers your costs and that the property grows in value over the long term.
Key requirements
Lenders treat buy-to-let borrowers differently from home buyers, largely because you are not living in the property and the loan is repaid from rental income rather than salary.
- Minimum deposit: 25% of the property value, though some lenders require 30-40%.
- Interest rates: higher than residential mortgages, typically 0.5-1.5% more.
- Affordability check: lenders usually require the rent to cover 125-145% of the mortgage payment.
- Fees: arrangement fees of £1,000-£2,500 are common.
Mortgage types for buy-to-let
| Type | How It Works | Best For |
|---|---|---|
| Interest-only | You pay only the interest each month. The full loan is repaid at the end. | Maximising monthly cash flow |
| Repayment | You pay interest plus some capital each month. The loan is repaid by the end. | Building equity and paying off the loan |
| Tracker | Follows the Bank of England base rate plus a margin. | Those comfortable with rate changes |
| Fixed rate | Rate stays the same for 2, 3, or 5 years. | Budgeting certainty |
Most buy-to-let landlords use interest-only mortgages to keep monthly costs low and maximise rental profit. The trade-off is that the underlying debt is never paid down during the term, so the eventual sale - or a repayment vehicle - has to deal with it.
Rental yield: what you can expect
Rental yield is the annual rental income expressed as a percentage of the property value. It is the simplest way to judge how much return you get from the rent alone.
Calculating rental yield
Gross rental yield = (Annual rent / Property value) x 100
Example: a property worth £200,000 renting for £900 per month.
- Annual rent: £900 x 12 = £10,800.
- Gross yield: (£10,800 / £200,000) x 100 = 5.4%.
Typical yields by region
Yields vary a great deal across the country, and they tend to be higher in cheaper areas where property prices are lower relative to rents.
| Region | Average Yield | Example City |
|---|---|---|
| North East | 6-8% | Sunderland, Middlesbrough |
| North West | 5-7% | Liverpool, Manchester |
| Yorkshire | 5-7% | Leeds, Sheffield |
| Midlands | 5-6% | Birmingham, Nottingham |
| Wales | 5-6% | Cardiff, Swansea |
| South West | 4-5% | Bristol, Exeter |
| South East | 3-4.5% | Brighton, Reading |
| London | 2.5-4% | Zones 3-6 |
Higher yields are generally found in cheaper areas. London has low yields but has historically offered strong capital growth - a trade-off between income and growth potential that shapes many landlords’ decisions.
Gross yield vs net yield
Gross yield does not account for costs. Net yield subtracts mortgage interest, management fees, maintenance, insurance, and void periods - the gaps when a property sits empty.
Using the earlier example: a 5.4% gross yield minus 2% for mortgage interest, 12% for a management fee, 1% for maintenance, and 5% for void periods comes out at roughly 2.5-3% net yield.
Always calculate net yield. It is the figure that shows your real return, and it is almost always lower than the headline gross number.
The true cost of buy-to-let
The purchase price is only the beginning. The true cost of buy-to-let includes a long list of items that many first-time landlords overlook.
Purchase costs
| Cost | Amount |
|---|---|
| Deposit | 25-40% of property value |
| Stamp duty surcharge | 3% on top of standard rates |
| Legal fees | £1,000-£2,000 |
| Mortgage arrangement fee | £1,000-£2,500 |
| Survey/valuation | £300-£600 |
| Total purchase costs | Typically 5-7% of property value |
Example: a £200,000 property
| Cost | Amount |
|---|---|
| Deposit (25%) | £50,000 |
| Stamp duty (3% surcharge) | £6,000 |
| Legal fees | £1,500 |
| Mortgage fee | £1,500 |
| Survey | £400 |
| Total upfront cost | £59,400 |
That is a substantial sum of money tied up before the first tenant moves in.
Ongoing annual costs
| Cost | Typical Amount |
|---|---|
| Mortgage interest | 2-5% of loan per year |
| Letting agent fees | 10-15% of rent |
| Maintenance/repairs | 1% of property value per year |
| Landlord insurance | £150-£400 per year |
| Void periods | 1-2 months rent per year (5-8%) |
| Gas safety certificate | £60-£100 per year |
| EICR (electrical) | £150-£200 every 5 years |
| Accountant fees | £200-£500 per year |
Hidden costs people forget
- Furnishing: if you let furnished, budget £3,000-£8,000 upfront.
- Tenant replacement: an EPC certificate, cleaning, and minor repairs between tenancies.
- Legal costs: evictions can cost £1,000-£5,000.
- Council tax: you pay it during void periods.
- Income tax: rental income is taxable, as covered below.
Tax on buy-to-let
The tax rules for landlords have changed significantly since 2020, and they are now a central part of the buy-to-let decision rather than an afterthought.
Rental income tax
Your rental income is added to your other income and taxed at your marginal rate:
- Basic rate (20%): taxable income up to £50,270.
- Higher rate (40%): taxable income from £50,271 to £125,140.
- Additional rate (45%): taxable income over £125,140.
Example: if your salary is £45,000 and you earn £10,800 in rental income, your total is £55,800. You pay 40% tax on the portion of rental income that falls above the higher rate threshold.
Mortgage interest relief
The rules here are important and often misunderstood. You can no longer deduct mortgage interest from your rental income before calculating tax. Instead, you receive a 20% tax credit on the interest you pay.
Example:
- Annual mortgage interest: £6,000.
- Tax credit at 20%: £1,200.
In practice this means higher rate taxpayers pay more tax than they did before 2020. A 40% taxpayer now effectively gets relief at 20% instead of 40%, which has reduced the profitability of buy-to-let for higher earners considerably.
Capital gains tax (CGT) on sale
When you sell a buy-to-let property, you may owe CGT on the profit:
- CGT allowance: £3,000 per year (2025-26).
- Basic rate: 18%.
- Higher rate: 24%.
Example: bought for £200,000 and sold for £280,000 gives a profit of £80,000. After the £3,000 allowance, CGT at the higher rate of 24% comes to £18,720.
Council tax
- You pay council tax during void periods.
- Some councils charge extra for properties left empty after 12 months.
Pros of buy-to-let
Leverage
You can control a £200,000 asset with a £50,000 deposit. If the property grows by 5% in a year, that is a £10,000 gain on your £50,000 investment - a 20% return. No other mainstream investment gives you this kind of leverage, which is one of the biggest attractions of property.
A tangible asset
Property is a physical asset you can see and touch. Unlike shares, it does not disappear if a company goes bust. You can also improve it to increase its value - something you cannot do with a fund.
Rental income
Monthly rent provides a regular income stream. In retirement, it can supplement your pension in a way that feels predictable and reliable.
Capital growth
UK property has historically grown in value over the long term. While there have been crashes - 2008 and the early 1990s come to mind - prices have generally recovered and exceeded previous peaks.
Inflation hedge
Rents and property values tend to rise with inflation. As the cost of living increases, so does your rental income and, historically, the property’s value.
Cons of buy-to-let
It is illiquid
You cannot sell a property quickly. It can take months to find a buyer and complete a sale, and your money is locked up for as long as you hold it.
Management hassle
Being a landlord means dealing with tenants, repairs, vacancies, and a growing body of regulation. Even with a letting agent, it takes time and effort, and a difficult tenant can cost thousands.
Tax changes
The removal of mortgage interest relief, replaced with a 20% tax credit, hit higher rate taxpayers hard. Many landlords have seen their tax bills rise significantly.
Void periods
Properties are not always occupied. A void period of 1-2 months per year is common, and during that time you still pay the mortgage, insurance, and council tax.
Rising costs
Maintenance, insurance, and regulatory compliance costs have all increased. Energy efficiency requirements - a minimum EPC rating of C by 2028 for new tenancies - may require expensive upgrades.
Concentration risk
Most buy-to-let landlords own just one or two properties. If that single property is in an area that declines, or sits empty for months, your entire investment is affected.
Is buy-to-let still worth it?
The honest answer is that it depends heavily on your situation.
When it works
- You have a large deposit. With 25-40% down, your mortgage costs are lower and you build equity faster.
- You buy in a high-yield area. Northern cities and university towns offer yields of 5-7% or more.
- You plan to hold long term. A 10-20+ year horizon lets you ride out market cycles and benefit from capital growth.
- You are a basic rate taxpayer. The tax changes hurt higher rate taxpayers more.
- You enjoy being a landlord. Or you are willing to pay a letting agent to handle the day-to-day work.
When it does not work
- You are stretching financially. If the mortgage is your biggest expense and you rely on rent to pay it, one void period or unexpected repair can cause problems.
- You are a higher rate taxpayer. The tax changes have significantly reduced profitability for higher earners.
- You want quick, liquid returns. Property is not an investment you can cash out quickly.
- You are buying in London or the South East. Yields of 2-3% barely cover costs after tax and fees.
Alternatives to buy-to-let
If you want property exposure without the hassle of being a landlord, several alternatives are worth considering.
REITs (Real Estate Investment Trusts)
REITs are companies that own and manage portfolios of properties - offices, shops, warehouses, and flats. You buy shares in the REIT and receive dividends from the rental income.
- Liquidity: buy and sell like any stock.
- Minimum investment: as little as £50.
- Diversification: exposure to many properties at once.
- Tax: dividends are taxed as income, though you can use an ISA to hold them tax-free.
- No management: no tenants, repairs, or void periods.
UK REITs include British Land, Land Securities, and Hammerson. You can buy them through a stocks and shares ISA or a general investment account.
Property funds
Property funds pool investor money to buy a portfolio of UK or international properties.
- Examples: L&G UK Property Fund, Schroder Real Estate.
- Minimum investment: usually £100-£500.
- Risk: the fund value fluctuates with property prices.
- Fees: typically 0.5-1.5% per year.
Property crowdfunding
Platforms like Property Partner and Crowdestate let you invest in individual properties alongside other investors.
- Minimum investment: varies, from £50 to £10,000 and above.
- Returns: rental income plus capital growth.
- Risk: less liquid, with platform risk attached.
Comparison
| Option | Hassle Level | Minimum Investment | Liquidity | Tax Efficiency |
|---|---|---|---|---|
| Buy-to-let | High | £50,000+ | Low | Low (post-2020 rules) |
| REITs | None | £50 | High | High (in ISA) |
| Property funds | None | £100-500 | Medium | Medium |
| Crowdfunding | Low | £50-10,000 | Low-medium | Varies |
Final considerations
Buy-to-let can build wealth through leverage, rental income, and capital growth - but it is not the passive, guaranteed investment it is often portrayed as. The tax changes since 2020, combined with rising costs and tighter lending, mean the numbers need to work harder than they used to. Before committing, it is worth budgeting for every cost - the stamp duty surcharge, letting agent fees, maintenance, void periods, and tax on the rental income - doing the maths on net yield, and being honest about whether you want the work that goes with being a landlord. A 5% gross yield can drop to 2-3% after costs and tax, so make sure the figures work before you buy. If you want property exposure without the hands-on effort, REITs and property funds held inside an ISA offer a far simpler and more liquid route. As with all investment decisions, this guide is general information rather than advice, and it is always worth checking current rates and rules, and taking professional advice, before acting.