Selling a Property Below Market Value

At Towerstone, we provide specialist property accountancy services for homeowners, landlords, and property investors. We have written this article to explain implications of selling under market value, helping you make informed decisions.

Yes, you can sell your house for less than market value in England and Wales, and it is perfectly legal to do so. There is no law that forces you to sell a property for its full market value. As the owner, you are free to agree any price you like with a buyer.

However, while the act of selling below market value is allowed, the tax, legal, mortgage, and benefit consequences can be significant. Many people only find this out after the sale has completed, when it is too late to undo the decision.

In this guide I will explain when and why people sell below market value, how it works in practice, and the key issues you must consider before going ahead. This includes Capital Gains Tax, inheritance tax, Stamp Duty, mortgage restrictions, and benefit rules. Everything here is explained in clear UK terms and based on current practice.

What does “below market value” actually mean?

Market value is generally defined as the price a property would reasonably achieve if sold on the open market, between a willing buyer and a willing seller, with proper marketing and no pressure on either side.

Selling below market value simply means agreeing a price that is lower than this open market figure.

This might be:

Slightly below market value

Significantly discounted

Sold at a nominal amount

Transferred for little or no money

The bigger the discount, the more important the tax and legal implications become.

Common reasons people sell below market value

People choose to sell at a discount for many legitimate reasons. The motivation is often personal rather than commercial.

Common scenarios include selling to family members, helping children onto the property ladder, transferring property as part of divorce or separation, selling quickly to avoid repossession, or disposing of a property where speed is more important than price.

In some cases, people sell cheaply because the property needs major work, or because they want certainty rather than the risk of a long sale.

The reason matters, because it often determines how HMRC and other authorities treat the transaction.

Selling to a family member or friend

One of the most common situations is selling a house to a child, sibling, or other family member at a reduced price.

Legally, this is allowed. You can agree any price you like.

However, for tax purposes, HMRC does not always accept the actual sale price.

When you sell to a connected person, such as a close family member, HMRC usually treats the sale as if it happened at full market value, even if you charged less.

This has major implications for Capital Gains Tax and inheritance tax.

Capital Gains Tax when selling below market value

Capital Gains Tax is often the biggest issue people overlook.

If the property is not your main home, and you sell it for less than market value, HMRC will usually calculate Capital Gains Tax using the market value, not the discounted price, if the buyer is a connected person.

This means:

You may pay CGT on a gain you did not actually receive in cash

The discount does not reduce the tax bill

The tax is based on what the property was worth, not what you sold it for

This catches many people out, particularly parents helping children.

If the property is your main residence, Private Residence Relief usually applies, which means no CGT is due. In those cases, selling below market value does not usually create a CGT problem.

Inheritance tax implications

Selling a property below market value can also have inheritance tax consequences.

If you sell for less than market value, the difference between the market value and the sale price is often treated as a gift.

That gift may be:

A potentially exempt transfer

Subject to inheritance tax if you die within seven years

Still counted as part of your estate in some circumstances

This is particularly relevant where parents sell cheaply to children but continue to live elsewhere.

If you continue to live in the property after selling it cheaply, without paying a market rent, the transaction may be treated as a gift with reservation of benefit, which can negate the inheritance tax planning entirely.

Stamp Duty Land Tax for the buyer

From the buyer’s perspective, Stamp Duty Land Tax is usually calculated on the price actually paid, not the market value.

So if a property is sold at a discount:

SDLT is based on the lower purchase price

This can reduce the buyer’s upfront costs

However, there are exceptions, particularly where the buyer takes on an existing mortgage or where complex trust arrangements are involved.

For most straightforward sales, the buyer benefits from lower SDLT.

Mortgage issues when selling below market value

If the buyer is using a mortgage, selling below market value introduces extra complications.

Lenders will usually require:

A professional valuation

Full disclosure of the relationship between buyer and seller

Confirmation that the discount is genuine

Many lenders treat this as a concessionary purchase or gifted equity.

Some lenders are comfortable with this, others are not. In some cases, the discount can be treated as the buyer’s deposit, but only if the lender agrees.

Trying to hide the true market value or the relationship between buyer and seller is risky and can invalidate the mortgage offer.

Selling below market value to avoid repossession

In distressed situations, such as financial difficulty or looming repossession, people sometimes accept a lower price for speed.

This is legally allowed.

However, if there is a mortgage on the property:

The lender must usually consent to the sale

The sale price must be enough to clear the mortgage, or shortfall arrangements must be agreed

Selling at an undervalue without lender consent can create serious legal problems.

Selling to reduce assets for benefit entitlement

Some people consider selling property cheaply to qualify for means tested benefits or care funding.

This is extremely risky.

Under deprivation of capital rules, if you deliberately reduce your assets to qualify for benefits or local authority support, the authorities may treat you as if you still own the value you gave away.

This can result in:

Benefit claims being refused

Care funding being denied

Long term financial consequences

Selling below market value shortly before claiming benefits is a major red flag.

Divorce and separation situations

Selling below market value sometimes occurs as part of a divorce or separation settlement.

In these cases:

The transfer may be court ordered

Special tax rules may apply

CGT can be reduced or deferred in some circumstances

These cases are highly fact specific, and professional advice is essential before agreeing any discounted transfer.

Selling below market value for speed or certainty

In some cases, sellers simply want certainty.

They may accept a lower price to:

Avoid a chain

Sell quickly

Reduce stress

Move on with their life

From a legal point of view, this is fine.

From a tax point of view, it is usually straightforward if the buyer is not connected, because HMRC generally accepts the actual sale price where the transaction is at arm’s length.

This distinction is crucial.

Connected vs unconnected buyers

A key concept in all of this is whether the buyer is connected to you.

Connected persons usually include:

Children and grandchildren

Parents and grandparents

Siblings

Spouses or civil partners

Certain trusts and companies

If the buyer is connected, HMRC is far more likely to substitute market value for tax calculations.

If the buyer is unconnected, such as a stranger or unrelated investor, HMRC usually accepts the actual price, even if it is low.

How HMRC determines market value

If market value matters, HMRC may look at:

Professional valuations

Comparable sales

Estate agent listings

The condition of the property

If a transaction is likely to be scrutinised, a formal valuation can be very important evidence.

Can I sell for £1 or gift my house?

You can legally sell a house for a nominal amount, such as £1, or gift it outright.

However, for tax purposes:

HMRC usually treats this as a disposal at market value

CGT may still apply

Inheritance tax rules almost certainly apply

Gifting property is rarely tax free, even if no money changes hands.

Practical steps to take before selling below market value

Before agreeing a discounted sale, it is sensible to pause and consider the full picture.

You should think about:

Whether the property is your main home

Whether the buyer is a connected person

Potential CGT exposure

Inheritance tax implications

Mortgage and lender consent

Impact on benefits or care funding

Whether a valuation is needed

In many cases, a small amount of advice can prevent very expensive mistakes.

Common misconceptions I see in practice

These issues come up repeatedly:

Believing tax is based on sale price in all cases

Assuming gifts avoid tax

Forgetting inheritance tax consequences

Ignoring mortgage lender rules

Trying to structure around benefit rules

Not realising HMRC treats family sales differently

Most problems arise because people assume property works like cash. It does not.

A simple way to think about it

A helpful rule of thumb is this:

You can sell your house for any price you like, but tax and benefit rules may ignore that price and use the market value instead.

Understanding that distinction is key.

When advice is strongly recommended

Professional advice is particularly important if:

You are selling to family

The property is not your main home

You are giving a large discount

You have other assets or complex affairs

You are planning for inheritance or care

Once a sale completes, the tax consequences cannot usually be undone.

Final thoughts

You can sell your house for less than market value, and in many situations it is a perfectly reasonable and lawful decision. However, selling cheaply does not mean the transaction is ignored for tax, benefit, or legal purposes.

The biggest mistake people make is assuming that the lower price reduces tax automatically. In many cases, especially with family transactions, that is simply not true.

If you are considering selling below market value, the most important step is to understand who you are selling to and why. That context determines almost everything that follows. Taking time to check the implications before agreeing a price can save you significant money, stress, and regret later on.

If you would like to explore related property guidance, you may find can i sell my house if i have equity release and can i sell part of my house useful. For broader property guidance, visit our property hub.