Selling a House to a Family Member: What to Consider

Selling a house to a family member — whether a child, parent, sibling, or other relative — is more common than many people realise. Parents may wish to help a child onto the property ladder at a favourable price. Siblings may want to transfer a share of aninherited property. A family member may simply be the most willing and convenient buyer.

Whatever the reason, the legal process is broadly the same as any other property sale. You will still need solicitors, searches, and Land Registry registration. What changes — and what catches many families out — is the tax treatment. HMRC has specific rules for transactions between “connected persons” that can mean you owe Capital Gains Tax on a gain you never actually received, or that your buyer owes Stamp Duty on a price they never actually paid.

This guide covers the key legal, tax, and practical considerations for selling a property to a family member in England and Wales.

HMRC's connected persons rules

The starting point for any family property transaction is understanding who HMRC considers a connected person. Under Section 286 of the Taxation of Chargeable Gains Act 1992, connected persons include:

• Your spouse or civil partner
• Your children and their spouses or civil partners
• Your parents and their spouses or civil partners
• Your grandchildren and their spouses or civil partners
• Your grandparents and their spouses or civil partners
• Your siblings and their spouses or civil partners
• Your business partners and their spouses or civil partners

Notably, aunts, uncles, cousins, and in-laws (beyond the spouses of those listed above) are generally not connected persons. This means a sale to a cousin, for example, does not automatically trigger the connected-person rules.

The critical consequence of being connected persons is that HMRC deems the transaction to take place at market value, regardless of what the buyer actually pays. This affects both Capital Gains Tax for the seller and, in certain circumstances, Stamp Duty Land Tax for the buyer.

Capital Gains Tax: selling at below market value

When you sell a property to a connected person, HMRC calculates your Capital Gains Tax liability based on the property's open market value at the date of transfer — not the price the buyer pays you. This is set out in Section 17 of the Taxation of Chargeable Gains Act 1992.

How the calculation works

Suppose you bought a property for £200,000 and it is now worth £350,000 on the open market. You agree to sell it to your daughter for £250,000 — a £100,000 discount on market value. For CGT purposes, HMRC ignores the £250,000 sale price. The gain is calculated as:

You would owe CGT on £140,000 (minus your annual exempt amount, which is £3,000 for the 2025/26 tax year), even though you only received £250,000 from the sale. The CGT rate on residential property gains above the basic rate band is 24% (or 18% for gains within the basic rate band) for the 2025/26 tax year.

Private Residence Relief

If the property is your main home and you have lived in it as your only or main residence throughout your period of ownership, Private Residence Relief (PRR) should exempt you from CGT entirely — even on a sale to a connected person. The connected-person rules change the deemed proceeds but do not remove your entitlement to PRR.

However, if the property is a second home, a buy-to-let, or an inherited property you have not occupied, PRR will not apply and the full market-value gain may be taxable.

Stamp Duty Land Tax on family sales

The buyer's SDLT position on a family sale depends on the specific circumstances. HMRC's guidance (SDLTM00390 and SDLTM04020) distinguishes between different types of below-market-value transactions:

• Sale at an agreed price with no gift element. If the buyer pays a genuine price and there is no intention to confer a benefit, SDLT is calculated on the actual consideration paid. However, HMRC may challenge this if the price is significantly below market value.
• Sale with a gift element. Where the seller deliberately sells below market value to benefit the buyer, HMRC may treat the chargeable consideration as the market value. This is more likely where the parties are connected persons.
• Outright gift (no consideration). If no money changes hands and there is no mortgage being assumed, SDLT is generally not due because the chargeable consideration is nil. But if the buyer takes on an existing mortgage as part of the transfer, the outstanding mortgage balance counts as consideration for SDLT purposes.

The buyer should also be aware of the higher rate SDLT surcharge (currently 5% above the standard rates). If the buyer already owns another property, the surcharge will apply to the family purchase. This can add thousands of pounds to the SDLT bill. For a full breakdown of transaction costs, see our guide on conveyancing costs.

Gifting vs selling: Inheritance Tax implications

When a property changes hands within a family at below market value, there is an overlap between CGT and Inheritance Tax (IHT) that can catch people out. The IHT treatment depends on whether you sell at full market value, sell at a discount, or give the property away entirely.

Sale at full market value

A sale at full market value is not a transfer of value for IHT purposes. The sale proceeds replace the property in your estate, so there is no reduction in your estate's value and no IHT consequence.

Sale at below market value

If you sell for less than market value, the difference between the market value and the sale price is treated as a transfer of value for IHT purposes. This is a chargeable lifetime transfer (CLT) if made to a trust, or a potentially exempt transfer (PET) if made to an individual. A PET drops out of your estate entirely if you survive for seven years after the transfer.

Outright gift

Gifting a property is a PET for IHT purposes. If you survive seven years, the gift falls outside your estate. If you die within seven years, taper relief may reduce the IHT payable on the gift, starting at three years after the date of the gift. The full value of the property at the date of the gift is used for the IHT calculation.

Gifts with reservation of benefit

This is one of the most important traps in family property transactions. Under the Finance Act 1986, if you give away a property (or sell it at a significant undervalue) but continue to benefit from it — for example, by living in it rent-free — HMRC treats the property as still forming part of your estate for IHT purposes. The gift is said to be “with reservation of benefit” and will be included in your estate on death.

To avoid this, you must either:

• Move out of the property entirely after the transfer, or
• Pay the new owner a full market rent for your continued occupation, reviewed regularly.

Additionally, HMRC may apply the pre-owned assets tax (POAT) charge under the Finance Act 2004 if you continue to occupy a property you have given away and you are not paying full market rent. This is an annual income tax charge based on the rental value of the property.

The importance of an independent valuation

An independent RICS valuation (a Red Book valuation carried out by a Royal Institution of Chartered Surveyors member) is not strictly a legal requirement for a family sale, but it is strongly recommended. Here is why:

• CGT defence. If HMRC queries the market value used in your CGT calculation, a professional valuation provides robust evidence to support your figures.
• SDLT evidence. If the buyer declares SDLT based on the actual sale price rather than market value, a valuation helps justify the position taken.
• IHT protection. If the transaction has an IHT element (sale at undervalue or gift), the valuation establishes the transfer of value for future reference.
• Mortgage requirement. If the buyer is obtaining a mortgage, the lender will commission their own valuation. An independent valuation obtained by the seller avoids surprises during the lending process.
• Family harmony. A professional valuation removes any ambiguity about price fairness, which can prevent disputes among other family members — particularly where an inheritance is involved.

A RICS valuation for a standard residential property typically costs £300 to £600, depending on the property's value and location.

Mortgage considerations for family sales

If the buyer needs a mortgage to purchase the property, the transaction becomes more complex. Lenders treat family sales with additional scrutiny because of the potential for non-arm's-length pricing and the risk of fraud.

Lender attitudes to concessionary purchases

A concessionary purchase (sometimes called a “family assisted purchase”) is where the buyer purchases the property at below market value from a family member. Many lenders will consider these, but:

• They will lend based on a percentage of the market value (as determined by their own valuation), not the discounted sale price.
• The discount given by the seller is often treated as a gifted deposit, and the lender will require a gifted deposit declaration confirming no repayment is expected.
• Some lenders require the buyer to contribute a minimum amount of their own funds (for example, 5% of the market value) in addition to the gifted equity.
• The lender may require confirmation that the seller will not continue to reside in the property after completion.

Existing mortgage on the property

If you have an outstanding mortgage on the property, it must be redeemed at completion from the sale proceeds. If the agreed sale price is lower than the mortgage balance, you will need to make up the shortfall from your own funds. Your mortgage lender's consent is not required for the sale itself, but the mortgage must be discharged before the property can be transferred with a clear title.

Do you still need a solicitor?

Yes — emphatically. Some families assume that because they trust each other, they can handle the transfer informally or with minimal legal involvement. This is a significant risk for several reasons:

• The transfer must be completed using an official TR1 transfer deed and registered at HM Land Registry. Errors on the TR1 can cause Land Registry requisitions and delays.
• SDLT returns must be filed with HMRC, even where no tax is due. Failure to file can result in penalties.
• The tax implications — CGT, SDLT, and IHT — are complex and depend on the specific circumstances. A solicitor or tax adviser can ensure both parties understand their obligations.
• If the buyer is taking out a mortgage, the lender will require the buyer to be represented by a solicitor on their panel.
• It is best practice for buyer and seller to instruct separate solicitors to avoid conflicts of interest, even in a friendly family transaction.

For a detailed guide to what to expect from the legal process, see our guide on how long conveyancing takes.

Transfer of equity as an alternative

If the goal is to add a family member to the title (or remove one) rather than to complete a full sale, a transfer of equity may be a simpler route. A transfer of equity changes the legal ownership of the property without the property being sold on the open market.

Common scenarios include:

• A parent adding an adult child to the title deeds of the family home
• One sibling transferring their share of an inherited property to another
• A couple separating, with one party transferring their share to the other

A transfer of equity is processed using a TR1 form and registered at HM Land Registry, just like a sale. The same tax rules apply: HMRC will treat the transfer as a disposal at market value for CGT purposes, and SDLT may be due if there is consideration — including where the person being added to the title assumes a share of an existing mortgage.

For a full list of the paperwork involved, see our guide on the documents needed to sell a house.

Practical steps for a smooth family transaction

A family sale should be treated with the same rigour as an arm's-length transaction. Here is a step-by-step approach to keep things on track:

1. Agree the terms in writing. Before instructing solicitors, agree the sale price, any conditions, and the expected timeline. Put this in writing, even if it is just an email. Verbal agreements cause misunderstandings.
2. Obtain an independent RICS valuation. This establishes the market value and provides evidence for tax purposes. Both parties benefit from knowing the true value of the property.
3. Instruct separate solicitors. Each party should have their own legal representation. This protects both sides and is a requirement if a mortgage is involved.
4. Take tax advice early. A solicitor or accountant with property tax experience should advise on the CGT, SDLT, and IHT consequences before the transaction proceeds. The cost of advice upfront is far less than an unexpected tax bill later.
5. Arrange the buyer's mortgage (if applicable). The buyer should speak to a mortgage broker early. Family transactions take longer to arrange, and not all lenders are willing to offer concessionary purchase mortgages.
6. Prepare the property documents. The seller should gather their title deeds, previous purchase documents, and any planning permissions or building regulations certificates. Your solicitor will need these to prepare the contract pack.
7. Complete the conveyancing process. The legal process follows the standard path: draft contract, buyer's searches, enquiries, exchange of contracts, and completion. For a full breakdown of costs, see our guide on conveyancing costs.
8. File all tax returns. The buyer must file an SDLT return within 14 days of completion. The seller must report any CGT liability on UK residential property within 60 days of completion using HMRC's online service.

Key tax thresholds and rates (2025/26 tax year)

The following table summarises the key tax rates and thresholds relevant to family property transactions for the 2025/26 tax year:

Common pitfalls to avoid

Family property sales go wrong most often when the parties assume the process is simpler than it is. Here are the most common mistakes:

• Not getting a valuation. Without a professional valuation, you have no defence if HMRC disputes the market value used in your tax calculations. The cost of a RICS valuation is small compared with a potential HMRC enquiry.
• Forgetting CGT on deemed gains. Many sellers assume they only owe CGT on the money they actually receive. With connected persons, the deemed proceeds are the market value — not the sale price.
• Ignoring the gift-with-reservation rules. Gifting a property to a child and then continuing to live in it rent-free is one of the most common IHT planning mistakes. HMRC is well aware of this arrangement and will include the property in your estate.
• Using the same solicitor. A single solicitor acting for both parties creates a conflict of interest. If the transaction is later challenged, neither party has independent legal protection.
• Missing the SDLT or CGT filing deadline. The buyer must file an SDLT return within 14 days of completion, and the seller must report CGT within 60 days. Late filing attracts automatic penalties from HMRC.
• Not considering other family members. A sale at below market value to one child can affect the inheritance expectations of other children. Clear communication with the wider family — and potentially adjustments to your will — can prevent disputes.

Sources

• HM Revenue & Customs — Capital Gains Tax on property (GOV.UK)
• Taxation of Chargeable Gains Act 1992, Sections 17 and 286 — legislation.gov.uk
• HM Revenue & Customs — Stamp Duty Land Tax guidance, SDLTM00390 and SDLTM04020 (GOV.UK)
• Finance Act 1986, Section 102 — gifts with reservation of benefit (legislation.gov.uk)
• Finance Act 2004, Schedule 15 — pre-owned assets tax (legislation.gov.uk)
• Inheritance Tax Act 1984 — potentially exempt transfers (legislation.gov.uk)
• HM Land Registry — Transfer of whole of registered title (TR1) (GOV.UK)
• RICS — Red Book valuation standards (rics.org)
• HM Revenue & Customs — Report and pay Capital Gains Tax on UK property (GOV.UK)
• UK Finance — Lenders' Handbook for England and Wales (ukfinance.org.uk)

Frequently asked questions