Selling a valuable asset can be an important financial milestone, but it may also create a Capital Gains Tax liability. Property owners, investors, business owners and individuals disposing of valuable possessions need to understand how their gain will be calculated, which reliefs may apply and when the transaction must be reported to HMRC.

Professional capital gains tax services can help you approach the disposal with greater clarity. Rather than waiting until the asset has been sold, early advice allows you to understand the likely tax cost, gather the correct evidence and consider legitimate planning opportunities before the transaction becomes legally binding.

What Is Capital Gains Tax?

Capital Gains Tax, commonly known as CGT, is a tax on the profit made when an individual sells, transfers or otherwise disposes of an asset that has increased in value. The tax normally applies to the gain rather than the total amount received.

A disposal does not always involve a conventional sale. Giving an asset away, transferring it to another person, exchanging it for something else or receiving compensation for a lost or destroyed asset may also be treated as a disposal for tax purposes.

Assets that may be subject to Capital Gains Tax include second homes, buy-to-let properties, shares held outside tax-efficient accounts, business interests, cryptocurrency and certain valuable personal possessions.

Why Professional Capital Gains Tax Services Matter

Capital Gains Tax calculations can become complicated when an asset has been owned for many years, records are incomplete or several owners are involved. Additional issues can arise when an asset was inherited, received as a gift or transferred for less than its market value.

A professional adviser can examine the complete history of the asset rather than simply subtracting the original purchase price from the selling price. This helps ensure that allowable costs are included, available losses are considered and any relevant relief is properly reviewed.

The calculation must also take account of your taxable income because this can affect the rate charged on the gain. A seemingly small error can therefore change the amount of tax payable or result in incorrect information being submitted to HMRC.

Calculating a Capital Gain

The starting point is usually the disposal value of the asset. From this, the original acquisition cost and qualifying expenditure may be deducted.

Allowable expenditure can include certain professional costs connected with buying and selling the asset, such as legal fees, valuation charges and estate-agent fees. Capital expenditure that improved the asset and remained reflected in its value when sold may also qualify.

Routine repairs, maintenance and expenses already claimed against income are not normally deductible from the capital gain. Distinguishing between a genuine capital improvement and ordinary maintenance can be difficult, particularly for property owners.

Where an asset was gifted or sold to a connected person for less than its true value, HMRC may require market value to be used instead of the amount received. Reliable valuations and supporting documents are therefore important.

Capital Gains Tax Rates and Allowances for 2026/27

For the 2026/27 tax year, the Annual Exempt Amount is £3,000 for most individuals and personal representatives. Most other trustees receive an allowance of £1,500.

For disposals from 6 April 2026, the general Capital Gains Tax rates for individuals are 18% and 24%. The rate that applies depends partly on the individual’s taxable income and the amount of the gain.

The Annual Exempt Amount is applied after allowable losses and relevant reliefs have been considered. Only the remaining taxable gain is charged at the appropriate rate. Current figures can be checked in HMRC’s Capital Gains Tax rates and allowances.

These allowances are considerably lower than they were several years ago. As a result, taxpayers making relatively modest gains may now find that they have a Capital Gains Tax liability.

Capital Gains Tax on Property

Property disposals are among the most common reasons people require capital gains tax services. Tax may arise when selling a buy-to-let property, holiday home, inherited house, development land or a home that has not qualified fully for Private Residence Relief.

The calculation may need to consider purchase and sale costs, improvement expenditure, periods of occupation, periods of letting and the ownership percentages of joint owners.

Private Residence Relief may protect some or all of the gain when a property has been the owner’s main home. However, the relief is not automatic in every situation. Problems can arise when the property was let, used for business, occupied only occasionally or owned alongside another residence.

When Capital Gains Tax is payable on the sale of UK residential property, it normally has to be reported and paid within 60 days of completion. Taxpayers who are already registered for Self Assessment may also need to include the disposal in their annual return. Further information is available in HMRC’s property reporting guidance.

Capital Gains Tax on Shares and Investments

Investors may face Capital Gains Tax when selling shares, investment funds or other financial assets held outside an ISA or pension.

Calculating the gain can become difficult when shares in the same company were bought at different times and for different prices. Specific share-matching rules may determine which acquisition cost is used. Corporate actions, reorganisations and share exchanges can add further complexity.

Cryptocurrency disposals may also be taxable. Selling tokens, exchanging one cryptocurrency for another, using crypto to purchase goods or giving it away can potentially create a disposal. Accurate transaction records are essential because exchange histories alone may not provide a complete tax calculation.

Using Capital Losses

Allowable capital losses can reduce taxable gains. Losses made during the same tax year are generally set against gains before the Annual Exempt Amount is applied. Unused qualifying losses from earlier years may also be carried forward.

However, a loss must be reported to HMRC before it can be used. A claim can normally be made within four years after the end of the tax year in which the disposal occurred. HMRC explains the process in its guidance on capital losses.

An accountant can review earlier transactions to determine whether valid losses have already been registered or whether a claim should now be made.

Capital Gains Tax on Business Disposals

Selling a business, partnership interest or shares in a personal company can produce a significant capital gain. Depending on the circumstances, Business Asset Disposal Relief may apply.

For qualifying disposals from 6 April 2026, gains covered by Business Asset Disposal Relief are taxed at 18%. The relief is subject to detailed conditions, many of which must be satisfied for at least two years before the disposal.

Business owners should therefore seek advice well before a proposed sale. Waiting until contracts have been signed may leave little opportunity to resolve ownership, employment or trading-status issues. The current requirements are explained in HMRC’s Business Asset Disposal Relief guidance.

Professional advice can also help determine how the sale proceeds should be allocated between shares, goodwill, property, equipment and other business assets.

Planning Before Selling an Asset

Capital Gains Tax planning is usually more effective before a disposal takes place. At this stage, an adviser can estimate the likely gain, review available reliefs and explain how the timing of the transaction may affect the tax position.

Planning might involve examining existing capital losses, considering the ownership of jointly held assets or confirming whether a business disposal satisfies the conditions for relief. Any decision should also make commercial and personal sense rather than being based solely on tax.

An advance calculation helps with cash-flow planning as well. Knowing the likely liability means that part of the sale proceeds can be reserved for HMRC instead of being spent or reinvested immediately.

Records Needed for a Capital Gains Tax Calculation

A reliable calculation must be supported by evidence. Useful records can include purchase contracts, completion statements, probate valuations, improvement invoices, legal-fee statements, share transaction reports and evidence of previous loss claims.

When original documents are missing, it may be necessary to obtain copies from solicitors, investment platforms or other professional advisers. In some circumstances, a qualified valuation may be required.

Maintaining a clear calculation and supporting file can be particularly valuable if HMRC later asks how the gain was calculated.

Capital Gains Tax Services from SAS Accountants

SAS Accountants provides professional support for individuals, landlords, investors and business owners dealing with Capital Gains Tax.

Our capital gains tax services can assist with establishing acquisition values, reviewing allowable costs, applying losses, checking relief eligibility and calculating the resulting liability. We can also help with property-disposal returns, Self Assessment reporting and correspondence with HMRC.

Whether you are planning a future sale or have already completed a disposal, speaking to SAS Accountants can help you understand your obligations and avoid unnecessary reporting errors.

Frequently Asked Questions
1. Do I pay Capital Gains Tax on the full selling price?

No. Capital Gains Tax is normally charged on the taxable gain rather than the total sale proceeds. The calculation may deduct the acquisition cost, qualifying fees, capital improvements, allowable losses, reliefs and the Annual Exempt Amount.

2. Is Capital Gains Tax payable when I sell my home?

A gain on your main home may be fully protected by Private Residence Relief. However, tax can arise if the property was let, used for business, not occupied as your main residence throughout ownership or included land beyond the permitted area.

3. How quickly must a residential property gain be reported?

Where Capital Gains Tax is due on a UK residential property disposal, it will normally need to be reported and paid within 60 days of completion. The disposal may also need to appear on your Self Assessment return.

4. Can previous investment losses reduce my Capital Gains Tax?

Qualifying capital losses may reduce taxable gains, but they must be reported to HMRC. Unused allowable losses can generally be carried forward and used against gains in later tax years, subject to the relevant rules.

5. When should I contact SAS Accountants?

Ideally, you should seek advice before selling or transferring the asset. Early advice provides more time to review valuations, reliefs, ownership arrangements and reporting deadlines. SAS Accountants can also assist after completion if the disposal has already taken place.