Could Capital Gains Tax Rise to 45%? What UK Property Investors Need to Know Now

Could Capital Gains Tax Rise to 45%? What UK Property Investors Need to Know Now

Capital gains tax reform is back on the agenda. Recent proposals suggest the Government could align CGT rates with income tax bands—potentially pushing rates from the current 24% maximum to 45% for higher earners. For UK property investors, this could fundamentally change the economics of buy-to-let ownership and exit strategies.

Let's examine what's being proposed, why it matters, and what you should consider now.

The Current Position vs. Proposed Changes

Today, capital gains tax in the UK operates on a two-tier system:

• Basic rate taxpayers: 18% CGT
• Higher rate taxpayers: 24% CGT

The proposals would align CGT with income tax bands entirely:

• 20% for basic rate taxpayers
• 40% for higher rate taxpayers
• 45% for additional rate taxpayers

On the surface, this might seem "fair." But the numbers tell a different story. A £100,000 capital gain would trigger:

• Current regime: £24,000 in tax
• Proposed regime: Up to £45,000 in tax

That's an 87.5% increase in tax liability. For property investors, this is material.

Why This Matters for Buy-to-Let Investors

Buy-to-let has already faced significant headwinds. Section 24 restrictions have squeezed rental yields for many landlords. Rising mortgage rates have compressed affordability. Now, the prospect of a higher exit tax could discourage portfolio exits altogether.

The Delayed Selling Problem

When capital gains tax rises, rational investors hold longer. A landlord considering selling a property worth £400,000, purchased for £250,000, currently faces:

• Current CGT: £36,000 (24% of £150,000 gain)
• Proposed CGT: £67,500 (45% of £150,000 gain)

That £31,500 difference might push a sale decision from "yes" to "wait and see."

The problem? If experienced landlords hold, the market experiences reduced supply. First-time buyers and portfolio builders find fewer properties available. The housing shortage worsens.

Impact on Property Supply

The lettings market depends on natural churn. Landlords exit for retirement, relocation, or portfolio rebalancing. Higher CGT makes exit less attractive, locking properties out of the sales market—and reducing stock available for owner-occupiers.

What the Evidence Shows

History offers cautionary lessons.

Sweden's Experience: When Sweden increased CGT by just 10%, tax revenue actually fell by 8%. People simply restructured their affairs or moved elsewhere.

HMRC's White Paper: The Office for Tax Simplification concluded that increasing CGT beyond 10% results in lower tax receipts overall. They estimate that a significant rise would cost the Exchequer £200 million annually through avoidance and reduced transactions.

America's 1987 Tax Hike: The US hiked capital gains tax rates and saw a one-year spike in receipts followed by a sharp decline. High earners timed transactions, restructured investments, or relocated.

The Investor Response: Capital Flight

Higher CGT doesn't just affect property. It affects investment appetite across all asset classes.

When returns on risk deteriorate, investors hunt for better opportunities. Property development, business acquisitions, and equity investments become less attractive in the UK. Capital flows to lower-tax jurisdictions: Ireland, Luxembourg, Singapore, Dubai.

Ireland offers a case study. Lower corporation tax (12.5%) has attracted Facebook, Google, and Apple. Those companies create high-wage jobs and economic dynamism. The UK's status as Europe's financial capital hasn't translated into comparable tech investment or innovation hubs. Higher CGT risks making that gap worse.

What Should UK Property Investors Do?

While this remains a proposal rather than policy, prudent planning is warranted.

1. Model Your Exit Strategy

Use our CGT Calculator to stress-test your portfolio under both current and proposed rates. Which properties trigger the highest tax? Which exits are marginal?

If you're holding a property with significant gains and considering a sale, the tax timing could matter enormously.

2. Optimise Your Portfolio Structure

If you're a higher earner, consider whether you should shift income-generating assets. For instance:

• Is your buy-to-let better held personally or through a limited company?
• Could spousal ownership or trusts provide flexibility?
• Are there legitimate hold-back strategies worth exploring with your accountant?

3. Review Your Yield Requirements

Higher CGT effectively reduces total return. If a property is marginal on yield today, it becomes worse if tax-on-exit increases. Use our Rental Yield Calculator and BTL ROI Calculator to build in realistic tax scenarios.

For new acquisitions, you might need to demand higher gross yields to justify the investment.

4. Factor Tax Into Purchase Decisions

When buying, account for CGT in your exit planning. If you're buying a £250,000 property and projecting it to sell for £350,000 in ten years, the tax tail now wags harder on total return.

5. Evaluate Business Sales and Development

If you've considered property development, renovation, or business investment, a CGT rise affects viability. Increased risk + higher tax = lower expected returns. These deals might not stack up under a 45% regime.

What Happens Next?

The proposal remains with Andy Burnham and other decision-makers. It hasn't been ruled out, and it hasn't been adopted. But it's "still kicking around," as the saying goes.

Historically, CGT reforms often take time to implement. That gives investors a window—though not an indefinite one—to plan and act.

Bottom Line

Capital gains tax reform could be material for UK property investors. A rise to 45% would represent the sharpest increase in decades and would likely trigger the very responses policymakers might not intend: delayed sales, reduced investment, and capital flight.

For now, focus on what you can control:

• Understand your current tax position
• Model your exit strategy under different scenarios
• Review whether your portfolio structure is optimal
• Ensure new acquisitions stack up under realistic tax assumptions

The debate isn't settled. But the time to plan for multiple scenarios is now.