Choosing the right Property Capital Gains Tax Accountant can make a substantial difference when you are selling a buy to let, second home, inherited property, development land or a former main residence. Property CGT is rarely just a matter of subtracting the purchase price from the selling price.

A specialist Property Capital Gains Tax Accountant should understand HMRC rules surrounding allowable costs, Private Residence Relief, periods of occupation, letting, inherited property, capital losses and the strict reporting deadline for UK residential property. For disposals requiring CGT reporting, HMRC generally requires the gain to be reported and tax paid within 60 days of completion.

Finding an Accountant With the Right Property CGT Expertise

Look for genuine property CGT experience

Property transactions can involve much more complicated tax issues than ordinary Self Assessment work. An accountant who mainly prepares annual accounts may not have sufficient experience with property disposals.

Ask whether the accountant regularly deals with:

• Buy to let property sales

• Former main residences

• Inherited property

• Property gifted to family members

• Development land

• Multiple property portfolios

• Jointly owned properties

• Non resident property owners

A good adviser should be able to explain how the acquisition cost, improvement expenditure, selling costs and available reliefs affect your taxable gain rather than simply applying a percentage to the sale profit.

Check whether they understand Private Residence Relief

Private Residence Relief can dramatically change the CGT calculation when a property has been your home at some point.

For example, suppose you bought a property for £250,000 and later sold it for £500,000, creating a £250,000 gain before allowable costs. If you lived there as your only or main residence for part of the ownership period and subsequently rented it out, the entire £250,000 may not be taxable.

HMRC confirms that the final nine months of ownership can normally qualify for Private Residence Relief where the property has been your only or main residence at some point. Different rules can apply in specific circumstances, including certain cases involving disability or long term residential care.

Your accountant should therefore examine the property's complete ownership and occupation history rather than assuming the whole gain is chargeable.

Ask about rental property and Letting Relief

A common mistake is assuming that anyone who rented out their former home automatically receives the old £40,000 Letting Relief.

That is no longer how the relief generally works. For disposals from 6 April 2020, Letting Relief is normally relevant where you occupied the property as your main residence while another part was let as residential accommodation. It does not generally apply simply because you moved out and let the entire property.

A knowledgeable accountant should ask questions such as:

• When did you live in the property?

• When did the letting begin?

• Did you occupy part of the property while it was let?

• Was any room used exclusively for business?

• Were there periods when the property was empty?

Those details can materially change the calculation.

Check how they calculate allowable costs

A strong property tax accountant should examine more than the original purchase price.

Depending on the circumstances, relevant expenditure can include qualifying capital improvement costs and certain acquisition and disposal expenses. Routine repairs and ordinary property running costs should not automatically be treated as capital expenditure.

For example, replacing an entire kitchen as part of a substantial improvement may require different treatment from simply repairing a damaged cupboard.

The accountant should also review:

• Solicitor and conveyancing costs

• Estate agent fees

• Certain professional valuation costs

• Stamp Duty Land Tax where relevant to the acquisition calculation

• Qualifying capital improvement expenditure

• Evidence supporting each expenditure item

Good records are particularly important where a property was purchased many years ago.

Make sure they understand current CGT rates

For the 2026 to 2027 tax year, individuals generally have a £3,000 Annual Exempt Amount. Residential property gains are generally taxed at 18% to the extent they fall within the available basic rate band and 24% above it.

These figures can change, so your accountant should identify the tax year of disposal rather than relying on an old calculation.

Test whether the accountant explains the calculation clearly

You should not feel that you are simply being handed a tax figure without understanding how it was reached.

A competent adviser should be able to walk you through:

1. Disposal proceeds

2. Less acquisition costs

3. Less qualifying capital expenditure and disposal costs

4. Less applicable reliefs

5. Less allowable capital losses where appropriate

6. Less the Annual Exempt Amount

7. Application of the relevant CGT rate

If an accountant cannot explain these stages in straightforward language, it is worth considering another adviser.

Choosing an Accountant Who Can Handle the Whole Transaction

Ask about the 60 day reporting requirement

The deadline is one of the most important reasons to involve a property CGT specialist early.

For a UK residential property disposal completed on or after 27 October 2021, CGT generally has to be reported and paid within 60 days. Waiting until the normal Self Assessment deadline can result in interest and penalties where an earlier property report was required.

Ideally, your accountant should become involved before completion so there is enough time to gather purchase documents, improvement invoices, valuations and ownership information.

Consider their experience with inherited property

Inherited property often creates confusion because the beneficiary does not normally calculate CGT from the deceased person's original purchase price.

The property's value at the relevant date for inheritance tax purposes can become important when calculating a later disposal by the beneficiary. The subsequent increase in value may create a CGT liability.

A specialist should also understand how estate administration, personal representatives, probate valuations and later beneficiary disposals interact.

This is particularly important where an inherited property is sold several years after the owner's death.

Check their approach to property ownership

Joint ownership can create additional considerations.

For example, a property owned by two individuals may require the gain to be allocated between them according to their beneficial interests. Transfers between spouses or civil partners can also have specific CGT consequences, so the accountant should establish the ownership history before preparing the calculation.

Do not assume that the person named on the mortgage automatically determines the tax position. Beneficial ownership and the surrounding facts can matter.

Ask whether they can identify tax planning opportunities

The best property CGT advice is not simply about calculating tax after a sale.

If you have not yet exchanged contracts or completed the transaction, there may be legitimate planning opportunities worth considering. These might involve the timing of a disposal, use of available capital losses, ownership considerations or establishing whether a particular relief applies.

However, a reputable accountant should distinguish genuine tax planning from aggressive arrangements. HMRC's rules concerning Private Residence Relief, property development and transactions undertaken primarily to realise a gain can be particularly important.

Compare fees without choosing on price alone

Property CGT fees vary according to complexity. A straightforward residential property calculation may be relatively simple, whereas a former residence with several periods of absence, letting, substantial improvements and multiple owners can require considerable analysis.

Before instructing an accountant, ask:

• Is the fee fixed or hourly?

• Does it include the CGT calculation?

• Does it include the HMRC property disposal report?

• Is Self Assessment included?

• Will the accountant review supporting documents?

• Are follow up HMRC queries included?

• Will additional advice cost extra?

A very cheap quote may not represent good value if important reliefs or allowable costs are overlooked.

Choose an adviser who reviews the evidence before giving an answer

The right Property Capital Gains Tax Accountant should request documentation rather than relying entirely on estimates.

Useful evidence can include the purchase contract, completion statement, sale statement, invoices for qualifying improvements, mortgage information where relevant, letting records, dates of occupation and previous tax calculations.

The accountant should then produce a defensible calculation that can be supported if HMRC asks questions.

For a property transaction involving significant tax, inheritance, previous letting, overseas residence or complicated ownership, choosing an adviser with demonstrable property CGT experience is usually more important than simply choosing the nearest accountant.

The objective is not merely to find someone who can submit a tax return. It is to find a professional who can reconstruct the property's tax history, identify legitimate reliefs, calculate the gain accurately and deal with HMRC reporting requirements within the relevant deadlines.