CGT
Capital Gains TaxMerranti

Capital Gains Tax Planning for Couples: The £1,200 Mistake You Can Avoid

Capital Gains Tax (CGT) can be one of the most significant — and often underestimated — tax liabilities faced by individuals selling property, investments, or other chargeable assets. Yet, for married couples and civil partners, one of the most effective tax-saving tools available is often overlooked: the “no gain/no loss” transfer rule.

In this article, we explore how couples can legally and efficiently use joint ownership to reduce their CGT liability before a sale, why so many fail to act, and how a simple oversight can lead to unnecessary tax of £1,200 or more — even on modest transactions.

The Basics: How CGT Works

Capital Gains Tax applies when a chargeable asset is sold or disposed of at a profit. The gain is calculated as the difference between the sale proceeds and the asset’s base cost (adjusted for allowable costs and reliefs).

For the 2025/26 tax year:

  • The annual exempt amount (tax-free allowance) is £3,000 per person
  • CGT is charged at:
    • 18% on residential property gains falling within the basic rate band
    • 24% on gains above the basic rate band (for residential property)
    • 10% and 20% for other assets such as shares

Where the asset is jointly owned, each party pays CGT based on their share of the gain, using their own exemptions and tax bands.

The “No Gain / No Loss” Rule for Couples

One of the most powerful — and underused — planning opportunities is found in section 58 of the Taxation of Chargeable Gains Act 1992. This states that transfers between spouses or civil partners who are living together are treated as taking place at no gain and no loss.

In practical terms, this means:

  • A husband and wife (or civil partners) can freely transfer assets between themselves without triggering CGT
  • The receiving partner takes on the original base cost of the asset
  • This allows couples to rebalance ownership before a disposal to:
    • Make use of both annual exemptions
    • Maximise use of any basic rate band available
    • Reduce exposure to higher CGT rates

This rule applies regardless of the value of the asset and no tax return is needed for the transfer itself.

Case Study: The £1,200 Mistake

Let’s look at a practical example to illustrate how easily a couple can pay unnecessary tax by failing to use this relief.

Scenario:

  • Jack and Emma are married.
  • Jack owns a buy-to-let property, purchased for £150,000, now being sold for £250,000 — a gain of £100,000.
  • Jack is a higher-rate taxpayer, and Emma is a basic-rate taxpayer with £30,000 of unused basic rate band.
  • Emma has also not used her £3,000 CGT annual exemption for 2025/26.

Without planning:

If Jack sells the property without transferring any share to Emma:

  • He will pay CGT on £97,000 (£100,000 gain less £3,000 exemption)
  • The entire gain is taxed at 24% (higher rate for residential property)
  • CGT = £23,280

With planning (30% transferred to Emma before sale):

Jack transfers 30% of the property to Emma using the no gain/no loss rule. Then they jointly sell the property. The gain is split:

  • Jack: £70,000 gain → £67,000 taxable → £16,080 CGT at 24%
  • Emma: £30,000 gain → £27,000 taxable after £3,000 exemption
    • £27,000 falls within her basic rate band, so taxed at 18%
    • Emma pays £4,860 CGT

Combined CGT: £20,940

Tax saving: £2,340

Even if Emma’s share of the gain were smaller (e.g. 10% or 15%), the couple would still save over £1,200 just by using both exemptions and a portion of the lower CGT rate band.

Common Pitfalls and Misunderstandings

Despite its simplicity, this planning opportunity is often missed due to:

1. Lack of Advice

Many individuals do not seek tax advice until after they’ve exchanged contracts. At that point, the opportunity to transfer ownership is lost, as HMRC considers beneficial ownership to be fixed at the time of disposal.

2. Belief That Legal Transfer Is Required

Some believe that a formal conveyance is needed. However, HMRC is concerned with beneficial ownership, not legal title. A Declaration of Trust is usually sufficient to adjust ownership percentages. This should be in writing, signed, and dated before the exchange of contracts.

3. Confusing CGT with Income Tax 50:50 Rules

While income from jointly owned property is generally split 50:50 for income tax (unless a Form 17 is filed), CGT is based on actual beneficial ownership at the time of disposal. The income tax position does not affect CGT.

4. Inheritance Tax Traps

Transfers between spouses are generally exempt for inheritance tax (IHT), but in cases of non-UK domiciled spouses, special limits apply. Care should be taken in international situations.

Professional Planning Points

Before using the no gain/no loss rule for CGT savings, consider the following:

  • Documentation: Always prepare a Declaration of Trust or similar document to evidence the beneficial ownership before the sale. It must be dated prior to exchange.
  • Stamp Duty Land Tax (SDLT): If the property has a mortgage, transferring a share may trigger SDLT on the proportion of debt transferred.
  • PPR Relief: For homes that qualify for Private Residence Relief, ensure that transferring ownership does not reduce the relief if one spouse hasn’t occupied the property.
  • Lettings Relief: If either spouse previously lived in the property, joint ownership may affect how any residual Lettings Relief is applied.

When Transfers Don’t Work

There are scenarios where the no gain/no loss strategy may not deliver savings:

  • Both spouses are higher-rate taxpayers
  • The gain is below the annual exemption for one or both parties
  • Time constraints: The sale is too far advanced to allow changes to ownership

Nonetheless, even modest changes to ownership can still save tax.

Summary

For married couples and civil partners, the no gain/no loss transfer rule remains one of the most straightforward and underutilised tax planning strategies. With the CGT annual exemption now reduced to £3,000, failing to use both allowances is increasingly costly.

Whether selling a buy-to-let, second home, business asset, or shares, taking the time to review ownership in advance of disposal could save thousands in tax.

How We Can Help

At Merranti Accounting, we regularly assist clients with pre-sale ownership planning, CGT forecasting, and Declaration of Trust preparation. If you’re planning a disposal — especially of property — we strongly recommend reviewing ownership in advance.

For tailored advice on CGT planning for couples, contact us today.

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