Capital Gains Tax on Commercial Property: How Your Ownership Structure Affects What You Pay

What Triggers Capital Gains Tax on Commercial Property?

CGT applies when you dispose of a commercial property, not just when you sell it.

Most investors think of CGT as a selling tax. It is, but "disposal" covers more ground than a straightforward sale. According to GOV.UK, a Capital Gains Tax (CGT) liability can be triggered when you sell, gift, exchange, or transfer a commercial property, and even a part-disposal of your interest counts as a chargeable event.

The trading versus investment distinction determines which tax you pay.

CGT applies when you hold commercial property as a capital asset. If buying and selling property is your core trading activity, HMRC treats your profits as trading income rather than capital gains, and you pay Income Tax or Corporation Tax instead. Getting this wrong can result in underpaid Income Tax, penalties, and interest.

The structure also matters: individuals and partners pay CGT on commercial property gains, while limited companies pay Corporation Tax instead. The decision you make before purchase locks in your tax treatment at exit, so it warrants the same attention as any other element of your investment strategy.

Each of the several types of property ownership in the UK carries different tax consequences. The applicable regime depends on whether you hold the property as a capital asset or trading stock, and whether you use it in a qualifying trade or simply let for rental income.

Whether you hold an office property, industrial building, or retail unit, the ownership structure you choose will determine which tax regime applies when you eventually dispose of it. If you have already disposed of a property and are unsure whether the correct treatment was applied, seek retrospective advice promptly as voluntary disclosure to HMRC is generally preferable to a compliance investigation.

How Does Your Ownership Structure Affect Your CGT Bill?

The legal structure you choose at purchase determines which tax regime applies at disposal.

Whether you hold commercial property as an individual, in a partnership, or through a limited company determines not just the rate you pay, but which tax you pay altogether. Individuals and partners pay CGT at 18% or 24%, per CGT rates and thresholds. Which rate you pay depends on the combined total of your taxable income and your taxable gain in the same tax year. The exemption amount and band thresholds can change, so verify them before any disposal.

Limited companies pay Corporation Tax on property gains instead, currently at 25% for profits over £250,000 or 19% for profits under £50,000. Check the current rates on Corporation Tax rates.

The illustrative figures below show how the two regimes compare on the same disposal.

These figures illustrate the tax bill on a £300,000 gain. The individual figure assumes the £3,000 annual exemption is deducted first. The individual figure applies the 24% higher CGT rate, while the limited company figure applies the 25% Corporation Tax rate.

The disposal tax rate is only one part of the ownership structure decision.

Disposal tax is only one piece of a broader structural decision. Rental income tax treatment, mortgage interest relief, inheritance planning, and profit extraction costs all factor in. This decision warrants input from a qualified tax adviser at the point of purchase, not when you are already planning your exit.

How Do You Calculate CGT on Commercial Property?

Your taxable gain is your sale price minus your allowable costs.

Your taxable gain is the difference between your disposal proceeds and your base cost. Allowable acquisition costs include the original purchase price, Stamp Duty Land Tax (SDLT), legal and conveyancing fees, surveyor fees, and capital improvement expenditure reflected in the property at disposal. Repairs and maintenance do not qualify. HMRC also permits disposal costs to be deducted from your sale proceeds, including estate agent fees, legal fees, and valuation costs. Gather this documentation before completion, not after.

This example shows how allowable costs reduce your taxable gain in practice.

A higher rate taxpayer pays 24% on £72,000, giving a CGT bill of £17,280. A basic rate taxpayer with significant other income in the same year will pay a blended rate across both thresholds. When selling a commercial property, getting your base cost right before instructing solicitors is one of the most practical steps you can take to avoid overpaying. Outstanding dilapidations claims can affect your net proceeds at disposal, so factor these into your calculations early.

Does BADR Apply to Your Commercial Property?

BADR can significantly reduce your CGT bill, but the qualifying conditions are strict.

Business Asset Disposal Relief (BADR), formerly known as Entrepreneurs' Relief, allows qualifying individuals to pay a reduced rate of CGT on gains up to a lifetime limit of £1 million. The current BADR rate is 18% for disposals made on or after 6 April 2026. Check the current BADR rate before any disposal decision, as this may change.

To qualify, you must be a sole trader or business partner, you must have owned the business for at least two years, and the commercial property must have been used in a qualifying trading business throughout that period. A property let to a third party for rental income does not qualify. HMRC treats rental activity as investment rather than trading, regardless of how the owner characterises it. Confirm with a qualified tax adviser now whether your property and ownership structure meet HMRC's conditions. For investors approaching the £1 million lifetime limit, the cost of waiting is not abstract. It is calculable, and it grows with every rate change.

Can You Defer Rather Than Pay Your CGT Bill?

Rollover Relief and Incorporation Relief both defer CGT, but deferral is not the same as saving.

Business Asset Rollover Relief allows you to defer a CGT liability when you reinvest proceeds from a qualifying commercial property disposal into another qualifying business asset within three years. You must make the claim within four years of the end of the disposal year or the year you acquired the replacement asset, whichever is later.

That reinvestment window is finite, and finding the right replacement asset can take time. Start by searching available commercial property stock early to put yourself in the strongest negotiating position. LoopNet allows you to filter commercial property for sale by asset class, location, and price as a practical starting point to identify a qualifying asset well before your reinvestment deadline.

Incorporation Relief applies when a sole trader or partnership running a genuine trading business transfers it into a limited company in exchange for shares. You must actively claim this relief via your Self Assessment return. It is no longer automatic. The relief is proportional: cash received alongside shares triggers an immediate CGT liability on that portion of the gain.

The deferred gain does not announce itself. It sits inside your replacement asset until the day you sell, and by then the rate environment may look very different. Deferral is not always the right choice. If you plan to sell the replacement asset within a few years, or if CGT rates are likely to rise, paying the tax now and resetting your base cost may serve you better.

Before using either relief, apply the discounted cash flow method of valuation to model whether deferring today genuinely serves your long-term position, and net present value analysis to quantify the real cost of that future liability.

What Are Your Reporting Obligations After Selling Property?

UK residents report through Self Assessment, while non-UK residents face a separate and stricter obligation.

Unlike residential property sales, there is no 60-day reporting window for UK residents disposing of commercial property. You must report your gain through your annual Self Assessment tax return. Check the current deadline and set aside the estimated tax as soon as contracts are exchanged. Non-UK residents must report all sales of UK property or land outside the Self Assessment cycle entirely, so seek professional advice before the sale completes. HMRC imposes automatic penalties and charges interest on unpaid tax if you miss a deadline.

This checklist helps you meet your CGT reporting obligations without missing a deadline.

• Confirm your residency status and which deadline applies to you.
• Calculate your provisional gain and set aside the estimated tax liability.
• Gather all supporting documentation including purchase contracts, improvement invoices, and disposal costs.
• Engage your accountant or tax adviser promptly.

Frequently Asked Questions

My spouse and I jointly own a commercial property. Do we each get a separate annual CGT exemption?

Yes. Where a commercial property is genuinely jointly owned by spouses or civil partners, each owner is entitled to their own annual CGT exemption. The current figure can change, so verify it before any disposal. Each spouse's gain is taxed according to their individual income tax position, and structuring ownership so the lower-income spouse holds a larger share can produce a meaningful tax saving. Any restructure must be a genuine legal transfer completed before exchange of contracts, or the original ownership split will apply for CGT purposes.

Does it matter whether I exchange contracts or complete the sale before the end of the tax year?

Yes. For CGT purposes, HMRC treats the disposal as occurring at the date of exchange of contracts, not completion. If you exchange in one tax year and complete in the next, your liability falls in the tax year of exchange. If you are planning your disposal around a lower-income year to reduce your CGT rate, it is the timing of exchange that matters, not completion. This requires forward planning of at least 12 to 24 months and professional advice before structuring a disposal around a specific tax year.