A Major CGT Bombshell Hidden in the 2025 Budget

Most landlords read the 2025 Budget and focused on the rise in property income tax rates. They would have been forgiven for thinking that was the main story. Every headline pointed in that direction. Every press release echoed the same message.

A far more significant change was hidden from view.

The Government has quietly rewritten the rules for one of the most important landlord tax reliefs in the UK. There was no mention in the Chancellor’s speech. There was no reference in the official summaries. There was no alert to accountants, landlords or professional bodies.

The announcement appeared only inside an obscure technical paper buried within the Autumn Budget documentation. It was not written for the public. It was not designed to attract attention. It sat several layers deep, where very few people would ever look.

From 6 April 2026, Incorporation Relief under Section 162 TCGA 1992 will no longer apply automatically. Landlords will be required to actively claim the relief. This change appears in the Government’s policy paper titled “Capital Gains Tax: Incorporation Relief claims.”

The measure is included within the Budget 2025 tax-related documents collection, confirming the new treatment of incorporation relief.

The Government’s technical note confirms that the change comes into effect from 6 April 2026.

This relief has been the backbone of many legitimate restructuring plans for years. It has allowed landlords to transfer a genuine property business into a company and defer Capital Gains Tax. The automatic nature of the relief has always been a central part of that process.

The Government has now confirmed that this will change. The measure is presented as a compliance improvement. No detailed explanation has been offered. The implications for landlords, accountants and solicitors are substantial. The fact that this change was buried so deeply raises questions about why it was not presented openly.

This article explains the change, why it matters and what landlords need to consider now.

What Incorporation Relief Does Today

Incorporation Relief under Section 162 TCGA 1992 allows a landlord to defer Capital Gains Tax when a property business is transferred into a company in exchange for shares. The relief applies when the rental activity meets the recognised test for a business, rather than a passive investment. Case law, activity levels and evidence of management decisions all play a part in establishing that status.

Under the current rules, incorporation relief applies automatically when the conditions in s162 are met. There is no separate claim process. The transfer is recorded on the tax return within the CGT section. Deferral is assumed unless HMRC challenges the basis of the claim.

This automatic mechanism has shaped landlord tax planning for many years. It has supported the movement of highly geared or Section 24-affected portfolios into a company structure. It has also formed part of long-term intergenerational planning through Family Investment Companies.

What Will Change From April 2026

The Government will shift incorporation relief from an automatic rule to a claims-based relief. The policy paper sets out that taxpayers must now actively claim the relief.

This adjustment may appear administrative on the surface. The practical consequences are more significant.

1. New deadlines will apply

Claims-based reliefs carry statutory deadlines. Late claims may be denied. This introduces new timing risks for landlords and advisers.

2. Evidence standards will rise

A claim must be supported by robust evidence that the business meets the necessary conditions. HMRC scrutiny may increase once the relief requires deliberate declaration.

3. Incorrect or omitted claims may trigger immediate CGT

Landlords who transfer property to a company after April 2026 could face an unexpected CGT bill if the claim is not made properly or is overlooked.

4. Advisory risk increases

Accountants and solicitors will face additional procedural duties. A claim-based system requires explicit advice and explicit compliance procedures.

5. Transactions will require more careful sequencing

Incorporation already demands careful planning around mortgages, valuations, lender consent and business substance. A claim step adds another critical stage that must be aligned with completion.

Why This Matters for Landlords Considering Incorporation

The change affects incorporations that complete from 6 April 2026 onwards. The relief remains automatic until that point.

Landlords who are considering restructuring for tax, finance or succession reasons should factor the new timeline into their plans.

Landlords planning incorporation within the next two years

A number of landlords have been waiting for mortgage fixes to end before restructuring. Those timelines may now collide with the new claims regime. Early planning will be vital.

Landlords affected by Section 24

Incorporation continues to be one of the few remaining routes that restores full mortgage interest deductibility. The claim requirement does not alter that benefit. It simply introduces a new procedural risk if the relief is not claimed correctly.

Landlords using incorporation as part of legacy planning

Succession plans that rely on a company structure often take time to design. The new claim step raises the importance of sequencing, documentation and professional advice.

Why Was This Change Hidden?

This update affects a major CGT relief used across the private rented sector. It was not referenced in the House of Commons speech. It did not appear in the Budget summary sent to the media. It sat inside a technical policy paper without a headline or a public explanation.

The low-profile release raises questions. Incorporation Relief plays a role in many restructuring exercises for landlords, small businesses and property investors. A change of this magnitude would normally be communicated with clarity.

Property118 believes the landlord community deserves transparency on measures that alter the risk profile of legitimate tax planning. Our role is to ensure that members understand the implications long before the rules come into force.

What Landlords Should Do Now

This change does not remove incorporation relief. It changes the way it is accessed.

Landlords should begin reviewing:

• the timeline of any planned restructuring
• the strength of evidence that their activity qualifies as a business 
• their wider tax position
• mortgage terms and lender consent issues
• the feasibility of completing planned incorporations before April 2026
• the procedural requirements that will apply after the change

The above should always have been done anyway, of course. However, a claims-based system will require careful documentation, clear reasoning and appropriate professional support. For many tax professionals, this will require a big step up to achieve Property118 standards. We suspect it will also shine a spotlight on how several mortgage lenders and professional advisers have, for decades now, been misinterpreting HMRC’s position on refinancing at the point of incorporation. Thankfully, an FOI request recently revealed that the Chartered Institute of Taxation and HMRC had agreed an update to CG65745 and ESC/D32, but the updated version has yet to be officially published. When it is, that will ‘put the cat among the pigeons’ too.

How Property118 Can Help

Property118 maintains a structured approach to incorporation planning. Our consultants work with landlords to:

• assess whether the activity meets the business test
• evaluate CGT exposure
• model financing options
• prepare documentation for accountants and solicitors
• ensure the sequence of events is logical and defensible

We will continue to update our guidance as HMRC releases further details of the claim mechanism and associated deadlines.

A Closing Thought

Tax planning for landlords is already challenging. The shift from an automatic relief to a claims-based procedure introduces a new point of failure that must not be overlooked. The change increases the importance of accurate evidence, clear documentation and early planning.

The 2025 Budget may be remembered for many headlines. This technical update could be the one that shapes the future of landlord restructuring for years to come.

Our consultancy not only covers retirement, business continuity and legacy planning. It can also unlock the lifestyle you once dreamed about but forgot to implement.

⚖️ Important notice – scope of planning support

Where our recommendations touch on areas requiring regulated input, we refer clients to appropriately authorised professionals for advice and execution.