Capital Gains Tax Part Disposal

Case Study: Adam’s Land Sale and CGT Calculation

On 22 August 2023, Adam sold six acres of land for £250,300. He incurred the following selling costs:

• Estate agent fees: £5,000
• Legal fees on sale: £2,300

The six acres were part of a 20-acre plot that Adam purchased in March 2004 for £637,000. He also paid:

• Legal fees on purchase: £5,500
• Stamp Duty Land Tax: £13,980

After the sale, he retained 14 acres, which an estate agent valued at £1,100,000 on the same date.

The goal is to calculate the chargeable gain arising from the sale.

Step 1: Determine the Acquisition Cost of the Sold Land

Adam originally bought 20 acres for a total cost of:

 £637,000 + £5,500 + £13,980 = £656,480

Value of Sold Land (£250,300) + Value of Retained Land (£1,100,000) =£1,350,300

Thus, the acquisition cost for the six-acre plot is £121,658.

Step 2: Deduct Allowable Costs

Adam incurred costs related to the sale:

• Estate agent fees: £5,000
• Legal costs on sale: £2,300
• Total disposal costs: £7,300

Step 3: Calculate the Chargeable Gain

Now, subtract the acquisition cost and selling expenses from the sale proceeds:

Chargeable Gain = Sale Price − Acquisition Cost − Selling Costs

=250,300 − 121,658 − 7,300$$=121,342$$

The chargeable gain for 2023/24 is £121,342.

Why Use Market Value Instead of Historic Cost?

The part-disposal rule relies on market value at the time of sale rather than simply dividing the original cost by acreage. This approach provides several key benefits.

• Ensures fair cost allocation: Land values fluctuate over time, so some sections may appreciate more quickly than others. Using market value helps reflect these changes.
• Leads to more accurate CGT calculations: Without market-based apportionment, the taxable gain could be overstated or understated, leading to incorrect tax reporting.
• Keeps calculations in line with HMRC guidelines: The formula follows HMRC’s requirements for part disposals, ensuring compliance and reducing the risk of errors.

How Does This Compare to Deemed Cost?

Many people confuse the part-disposal rule with deemed cost, but they serve different purposes. The deemed cost rule replaces the original purchase cost with a legally required market value when the actual cost cannot be used. This situation applies in the following cases:

• The land was acquired before April 1982, so HMRC requires its market value as of 31 March 1982 instead of the original purchase price.
• The property was received as a gift or inheritance, meaning its market value at the time of transfer determines the acquisition cost.
• A transfer occurred between connected persons (e.g., family members), so HMRC applies the market value rather than the actual transaction price.

Since Adam purchased the land himself, the part-disposal rule applies rather than deemed cost.

Conclusion

Selling part of a landholding triggers Capital Gains Tax (CGT), so understanding the correct cost allocation method is essential. The part-disposal formula ensures a fair distribution of acquisition costs based on market value. As a result, it helps taxpayers avoid miscalculations, stay compliant with HMRC rules, and report gains accurately.

For anyone selling a portion of their property, applying the right CGT rules makes a significant difference. Failing to allocate costs correctly could lead to unnecessary tax liabilities. Therefore, consulting a tax adviser ensures proper compliance and effective financial planning.

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