Capital Gains Tax on Land and Leases

Capital Gains Tax applies when you dispose of land or property, but the calculations can become complex when dealing with leases, part-disposals of land, or situations where valuation becomes critical. Understanding how these special rules work helps you report gains accurately and claim any reliefs you're entitled to.

What counts as a disposal of land

A disposal occurs when you sell, transfer, or otherwise dispose of land or property. This includes selling freehold land, disposing of part of a larger plot, or creating or selling a lease.

Land disposals also include situations where you receive compensation for land, such as through compulsory purchase orders, and cases where land is appropriated by an authority without your agreement.

How leases are treated for Capital Gains Tax

The treatment of a lease for Capital Gains Tax depends on its length. This determines whether creating or disposing of a lease results in a capital gain.

Short leases (50 years or less) are treated as wasting assets. A wasting asset is one with a predictable life of 50 years or less. As a lease gets shorter, it reduces in value. This affects how you calculate any gain or loss.

Long leases (more than 50 years) are treated the same as freehold property for Capital Gains Tax purposes. The normal Capital Gains Tax rules apply when you dispose of these leases.

Granting a lease from freehold property

When you own a freehold property and grant (create) a lease to someone else, the Capital Gains Tax treatment depends on whether you receive a premium (an upfront payment).

If you grant a lease for a premium, part or all of that premium may be taxable as income rather than as a capital gain. This is because lease premiums can be charged to Income Tax under property income rules. Any part of the premium not charged as income may then be subject to Capital Gains Tax.

When you grant a lease, you're making a part-disposal of your freehold interest. The calculation involves working out what proportion of your property's value you've disposed of.

Part-disposals of land

When you sell part of a piece of land but keep the rest, you're making a part-disposal. The Capital Gains Tax calculation requires you to work out how much of your original cost relates to the part you've sold.

The formula for calculating the allowable cost is:

Cost × (A / (A + B))

Where:

• A is the value of the part disposed of
• B is the value of the part retained

For example, if you originally bought land for £100,000 and later sell part of it for £60,000 (with the remaining land worth £140,000), the allowable cost would be:

£100,000 × (£60,000 / (£60,000 + £140,000)) = £30,000

Your capital gain would be £60,000 minus £30,000 = £30,000 (before deducting your annual exempt amount and any other allowable costs).

Small part-disposals of land

A special rule exists for small disposals of land from a larger holding. If the proceeds from selling part of your land are both:

• 20% or less of the value of the entire holding, and
• £20,000 or less

you can elect to defer the capital gain. Instead of paying Capital Gains Tax now, you deduct the proceeds from the original cost of the land. This reduces the base cost for when you eventually dispose of the remainder of the property.

This election must be made in your tax return for the year of disposal. It can be beneficial if you want to delay paying tax, though it means you'll have a larger gain when you eventually sell the remaining land.

Compulsory purchase and compensation

When land is compulsorily purchased or you receive compensation for loss or damage to land, Capital Gains Tax may apply. The compensation or payment is generally treated as disposal proceeds.

You may be able to claim rollover relief if you use the compensation to buy replacement land or property. This allows you to defer the capital gain by deducting it from the cost of the replacement asset.

The timing of the disposal is important. The disposal generally occurs when the compensation is agreed or awarded, not necessarily when you receive payment.

Valuation considerations

Many land and lease transactions require you to establish market values rather than relying solely on actual sale proceeds. You need valuations when:

• Making a part-disposal (to determine the value of the land retained)
• Disposing of land to a connected person (such as family members or business partners)
• Receiving land as a gift or inheriting land that you later sell
• Calculating deemed market value for transactions not at arm's length

Market value is the price the asset might reasonably be expected to fetch on a sale in the open market. For land and property, this often requires a professional valuation from a qualified surveyor, particularly for substantial transactions or where HMRC might challenge your figures.

Reporting land disposals on your tax return

You must report disposals of land and property on your Self Assessment tax return, even if the gain is covered by your annual exempt amount (£3,000 for 2025/26 for most individuals).

For significant property disposals, you may need to report and pay any Capital Gains Tax due within 60 days of completion using the UK property disposal return system. This applies to disposals of UK residential property.

The calculations for leases, part-disposals, and valuations should be supported by clear records and, where appropriate, professional valuations. Keep all documentation relating to purchase costs, improvement costs, and disposal proceeds.

Sources

• Capital Gains Tax land and leases (Self Assessment helpsheet HS292)

This article provides general guidance based on current HMRC rules. For advice specific to your situation, speak to your accountant.