For decades, buy-to-let property was sold as one of Britain’s safest paths to building wealth.
The formula appeared straightforward. Buy a property, collect rent, pay the mortgage, maintain the asset, and pay tax on whatever profit remained. Rising house prices did much of the heavy lifting, while rental income provided a steady stream of cash flow.
Then came Section 24.
Introduced through the Finance Act 2015 and phased in between 2017 and 2020, the measure fundamentally altered how individual landlords are taxed. Supporters described it as a necessary reform that would level the playing field between investors and aspiring homeowners. Critics described it as a tax raid on the private rental sector.
Years later, one question continues to divide investors:
Did Section 24 simply change landlord taxation, or did it destroy the traditional economics of buy-to-let investing altogether?
The Day Profit Stopped Being Profit
Before Section 24, landlords could deduct mortgage interest before calculating their taxable profit.
If a landlord collected £18,000 in rent, paid £10,000 in mortgage interest, and incurred £2,000 in other expenses, their taxable profit would be £6,000.
A higher-rate taxpayer paying 40 percent tax would owe £2,400, leaving £3,600 in post-tax profit.
The numbers made sense.
The landlord was taxed on the money they actually made.
Section 24 changed that.
Under the new rules, mortgage interest is no longer fully deductible for individual landlords. Instead, landlords calculate tax on rental income before deducting mortgage interest and then receive a limited 20 percent tax credit.
Using the same example, taxable income rises to £16,000.
The resulting tax bill increases from £2,400 to £4,400.
The landlord’s economic profit remains £6,000, but their post-tax profit falls to just £1,600.
Nothing changed about the property.
Nothing changed about the tenant.
Nothing changed about the mortgage.
Only the tax rules changed.
The Example That Still Angers Landlords
The impact becomes even more striking for heavily leveraged investors.
Imagine a property generating £15,000 in annual rent.
Mortgage interest costs £12,000.
Other expenses amount to £1,000.
The landlord’s real profit is £2,000.
Under the old rules, tax would be calculated on that £2,000 profit.
Under Section 24, tax is calculated on £14,000 of income before mortgage interest is considered.
The final tax bill can exceed the landlord’s actual profit.
In some cases, landlords can find themselves losing money despite operating a profitable rental property.
This is why many investors argue that Section 24 effectively taxes turnover rather than profit.
Technically that description is not entirely accurate. The Government would argue that landlords still receive a tax credit.
Yet for many landlords, the practical effect feels remarkably similar.
Why the Government Did It
The Government’s reasoning was politically simple.
A homeowner buying a family house cannot deduct mortgage interest from their tax bill.
Why should a landlord?
Ministers also argued that highly leveraged investors were competing against first-time buyers and helping drive house prices higher.
Reducing tax advantages for landlords, they argued, would create a fairer housing market.
The policy was never universally popular, but it reflected a growing political consensus that home ownership should take precedence over investor expansion.
The Unintended Consequences
What happened next remains fiercely debated.
Supporters point to a moderation in buy-to-let activity and argue that the reforms reduced investor demand.
Landlords point to something else.
Rental supply tightened.
Thousands of landlords sold properties.
Many stopped expanding.
Others left the market entirely.
At the same time, demand for rental accommodation remained strong.
The result was a surge in rents across many parts of the country.
The irony is difficult to ignore.
A policy designed to improve affordability may have ultimately increased housing costs for many tenants.
The Bigger Problem Is Not Section 21
Much attention has recently focused on the abolition of Section 21 under the Renters’ Rights Bill.
Many landlords are concerned about losing the ability to regain possession of their properties without establishing specific legal grounds.
Yet ask many experienced investors what changed the market most dramatically, and they rarely mention Section 21.
They mention Section 24.
For many, that was the moment buy-to-let ceased being a straightforward investment model.
The loss of mortgage interest relief arguably had a far greater impact on returns than the loss of no-fault evictions ever will.
Why Investors Are Looking Overseas
This is where the conversation becomes particularly interesting.
Increasingly, investors are not simply asking whether UK property remains attractive.
They are asking whether their money might work harder elsewhere.
Jamaica, Barbados, the Bahamas, the Dominican Republic, and other Caribbean markets are attracting growing attention from overseas investors.
The reasons are not difficult to understand.
Many Kingston apartments produce gross rental yields between 6 and 10 percent.
Many UK buy-to-let properties struggle to achieve 4 to 6 percent.
Jamaica has no equivalent of Section 24.
Property taxes are generally lower.
Diaspora demand remains strong.
Urbanisation continues to support housing demand in key locations.
The economics can appear compelling.
Consider two hypothetical investments.
A £250,000 UK buy-to-let generating £12,000 annual rent produces a gross yield of approximately 4.8 percent.
A US$200,000 Kingston apartment generating US$18,000 annual rent produces a gross yield of approximately 9 percent.
On income alone, the Caribbean property appears significantly more attractive.
Why Britain Still Wins Some Arguments
None of this means Britain has become a bad place to invest.
Far from it.
The UK continues to offer advantages that many Caribbean markets cannot easily replicate.
Mortgage finance is widely available.
The economy is significantly larger.
The rental market is deeper.
Liquidity is stronger.
Selling a property in a major UK city is often considerably easier than selling a comparable property in smaller Caribbean markets.
The UK also allows investors to use leverage more effectively.
Many lenders continue to offer loan-to-value ratios of 75 percent or higher.
That ability to control large assets with relatively modest deposits remains one of Britain’s strongest attractions.
This explains why many investors continue buying UK property despite Section 24.
They are often pursuing capital appreciation rather than immediate cash flow.
Others purchase through limited companies, where mortgage interest remains deductible.
The Real Question Investors Should Be Asking
The debate is often framed as Britain versus the Caribbean.
That may be the wrong question.
The better question is what an investor is trying to achieve.
If the objective is monthly income and cash flow, parts of the Caribbean can make a persuasive case.
If the objective is leverage, liquidity, financing availability, and access to one of the world’s deepest housing markets, Britain retains significant advantages.
Increasingly, sophisticated investors are concluding that the answer is not one or the other.
It is both.
The strongest portfolios often combine the cash flow potential of markets such as Jamaica with the financing flexibility and long-term depth of the United Kingdom.
What is clear, however, is that Section 24 changed the conversation forever.
Buy-to-let is not dead.
But the era when an ordinary investor could buy a heavily mortgaged property in their own name and expect generous tax treatment has largely passed into history.
For better or worse, Section 24 did not simply change landlord taxation.
It changed the business model of British buy-to-let itself.