Keep evidence from the day you acquired it
Keep the competition paperwork, transfer documents, any professional valuation, estate-agent evidence and details of the property's condition when it became yours.
Quick answer
Do You Pay Capital Gains Tax When You Sell a House You Won?
You may pay Capital Gains Tax if the house has risen in value after you acquired it. HMRC's guidance on windfall prizes says that when the prize is an asset, the winner is treated as acquiring it at its market value at the time they receive it.
That means the basic calculation is not “sale price minus ticket price”. It starts with the property's market value when it became yours, then takes account of the sale proceeds, allowable costs, your annual CGT exemption and any relief such as Private Residence Relief.
If you sell for roughly the same value as when you acquired the property, there may be little or no gain. If you sell for less, there may be a capital loss rather than a gain, depending on how the property was used.
The calculation
How Capital Gains Tax Is Worked Out on a Prize House
For a straightforward prize house that has not been your fully relieved main residence, this is the basic shape of the calculation.
Sale proceedsWhat the buyer pays for the house
−
Acquisition valueMarket value when the prize house became yours
−
Allowable costsQualifying sale fees and capital improvements
Example: you acquire a competition house with a market value of £4 million and later sell it for £4.2 million. Before reliefs, the starting gain is £200,000 — not £4.2 million.
If you also paid £70,000 of allowable estate-agent, legal and qualifying improvement costs, the gain before the annual exemption and any Private Residence Relief would fall to £130,000.
Same £4m prize, four different outcomes
What If You Sell a £4 Million Prize House?
Assume £4 million is the genuine open-market value when you acquire the property. These examples are before selling costs, reliefs and the annual exemption.
Sale price compared with £4m acquisition value
The taxable figure is the gain, not the total amount of cash you receive from the buyer.
A genuine sale below the acquisition market value can produce a capital loss, although losses attributable to periods covered by Private Residence Relief can be restricted. Selling costs can also change the numbers.
Interactive example
Prize House Capital Gains Tax Estimator
Enter the market value when you acquired the house, the sale price and qualifying costs. Choose how much of the gain you expect to be covered by Private Residence Relief. This is a simple illustration rather than a tax return calculation.
Gain before relief£150,000
PRR deducted£0
Taxable gain£147,000
Illustrative CGT£35,280
This simple estimate assumes the selected rate applies to the whole taxable gain. A basic-rate taxpayer can have gains split between 18% and 24%, and real Private Residence Relief is calculated from qualifying periods rather than simply chosen as a percentage.
A SERP gap worth understanding
Is the Competition's Advertised House Value Automatically the HMRC Value?
Not necessarily. The relevant concept is open-market value when the property became yours. A promoter's marketing value, estate-agent estimate or headline “worth £4 million” figure may be useful evidence, but it is not automatically binding on HMRC.
HMRC can check valuations used in a Capital Gains Tax calculation. After a disposal, you can also ask HMRC for a post-transaction valuation check if a market value needs to be agreed.
Why this matters
On a multi-million-pound house, a valuation difference of £100,000 or £200,000 can materially alter the gain when the property is later sold.
Do not automatically use the ticket price as the acquisition cost
HMRC's Capital Gains Manual specifically deals with prizes in the form of assets and says market value at acquisition is used. The cost of entering the competition is not a substitute for the value of the house.
Reducing the gain correctly
What Costs Can You Deduct When Selling a Prize House?
HMRC allows certain costs of buying, selling or improving property to be deducted when working out a capital gain.
| Cost | Usually deductible from the gain? | Example |
|---|---|---|
| Estate-agent selling fee | Yes | Agent commission for marketing and selling the property. |
| Solicitor / conveyancing sale fee | Yes | Legal work directly connected with the disposal. |
| Professional valuation costs | Potentially | A valuation reasonably required for the CGT calculation. |
| Capital improvement | Potentially | An extension or improvement still reflected in the property when sold. |
| Normal decorating | No | Routine painting, maintenance and repairs normally do not count as capital enhancement. |
| Council Tax, utilities and insurance | No | Normal ownership and running costs are not part of the CGT acquisition or disposal calculation. |
Example: the property rises from £4m to £4.3m, but you pay £75,000 in qualifying sale and capital-improvement costs. Before reliefs and the annual exemption, the £300,000 headline increase becomes a £225,000 gain.
Private Residence Relief
What If You Live in the Prize House Before Selling It?
If the property genuinely becomes your only or main residence, Private Residence Relief can reduce or remove Capital Gains Tax when you sell.
Full relief can apply where it has been your only or main home throughout ownership and the other conditions are met. If it was only your main home for part of the ownership period, relief is generally apportioned.
The final nine months of ownership normally qualify for Private Residence Relief if the property has been your only or main residence at some point, even if you were not living there during those final months.
Live there from day one
If the prize house genuinely becomes your main home for the whole ownership period and the normal conditions are met, full Private Residence Relief could remove the CGT on sale.
Move in for a short time just before selling?
There is no simple “live there for six months and it becomes tax-free” rule. HMRC looks at whether a property was genuinely your residence and at the qualifying periods of occupation.
Main residence is about real use, not a tax switch
Changing an address on paperwork alone does not guarantee relief. HMRC's rules look at the property being used as your only or main residence, and special rules can apply if a dwelling was acquired for the purpose of realising a gain.
Sell straight away?
What Happens if You Sell the Prize House Immediately?
Selling quickly does not itself create a special tax charge. The question is still whether a gain arose between the market value when you acquired the house and the net disposal proceeds.
If a £4 million prize house is sold shortly afterwards for around £4 million and selling costs are incurred, there may be little or no taxable gain. A quick sale could even produce a capital loss.
Example: market value at acquisition £4m; sale price six weeks later £3.95m; qualifying selling fees £60,000. The simple CGT calculation starts with a loss rather than a gain.
That does not mean selling quickly is always financially best. It simply means CGT is based on the change in value, not on the fact the house arrived as a prize.
When the sale price is lower
Can You Claim a Capital Loss on a House You Won?
If a prize property is a chargeable asset and you sell it for less than its tax acquisition value after allowable costs, a capital loss can arise. Capital losses can normally be set against capital gains under the usual CGT rules.
There is an important exception for a home: HMRC says that where a loss relates to a property that would have qualified for full Private Residence Relief had there been a gain, that loss is not an allowable capital loss. Partial relief can also restrict part of a loss.
“It was advertised at £4m but I sold it for £3.6m” needs evidence
The answer depends on the genuine market value when you acquired the property. If the promoter's headline valuation was higher than the true open-market value, you cannot automatically claim the difference as a tax loss. This is why contemporaneous valuation evidence matters.
2026/27 rates
What Capital Gains Tax Rate Applies in 2026/27?
The individual CGT annual exempt amount is £3,000 for 2026/27.
For gains from 6 April 2026, a higher- or additional-rate taxpayer generally pays CGT at 24%. For a basic-rate taxpayer, the rate can be 18% on the part of the gain that falls within the available basic-rate band and 24% on the remainder.
Illustration: a higher-rate taxpayer has a £100,000 chargeable gain after allowable costs and Private Residence Relief, and still has the full £3,000 annual exempt amount. £97,000 would remain taxable. At 24%, that is an illustrative CGT bill of £23,280.
Do not miss the deadline
When Must You Report Capital Gains Tax on a Prize House Sale?
If you are a UK resident and have Capital Gains Tax to pay on the sale of UK residential property, HMRC says you normally need to report and pay it within 60 days of completion.
Do not assume you can simply wait until the following Self Assessment deadline. The UK property reporting deadline is separate.
Confirm acquisition value
Establish the open-market value when the prize property became yours.
Keep sale records
Retain the completion statement, estate-agent fees, legal costs and qualifying improvement records.
Calculate relief
Work out Private Residence Relief and any other relevant CGT adjustments.
Report within 60 days
If CGT is due on UK residential property, report and pay by HMRC's property deadline.
Keep this from the day you win
Records a House Competition Winner Should Keep
HMRC requires records that support the figures used in a CGT calculation. A prize-house winner has one extra reason to be organised: there may be no traditional purchase invoice showing what the house cost you.
| Keep | Why it matters |
|---|---|
| Prize and competition documents | Shows when and how you acquired the property. |
| Land Registry / completion paperwork | Helps establish the acquisition and disposal dates. |
| Independent valuation at acquisition | Supports the CGT market value used as the starting point. |
| Photographs and condition reports | Useful supporting evidence of the property's state when acquired. |
| Capital-improvement invoices | Some qualifying enhancement expenditure can reduce the gain. |
| Estate-agent and solicitor invoices | Direct selling costs can normally be deducted. |
| Evidence of main-home occupation | Can support a Private Residence Relief claim where relevant. |
Omaze and other competition houses
Does It Matter Which House Competition You Won?
For Capital Gains Tax, the central question is the property you acquired and what happened to it afterwards — not whether the operator was Omaze, Raffle House, BOTB, Elite Competitions or another promoter.
The operator still matters for the paperwork. Prize terms can affect when ownership transfers, the property's stated value, whether you can choose cash instead, what costs the promoter pays and what additional prizes are included.
Omaze
Omaze is the strongest branded search around selling a competition house. Its current terms say winners can live in, rent or sell the house. Keep the transfer documents and any valuation supplied at handover.
Raffle House, BOTB, Elite and others
The same CGT principles can apply to a house prize, but cash alternatives and prize packages vary. Use the exact competition rules rather than assuming they match Omaze.
Start with our broader UK house competition tax guide if you want the rules on winning, Stamp Duty, rent, Council Tax and inheritance as well as selling.
Common questions
Selling a Prize House & Capital Gains Tax FAQs
Do I pay CGT on the full value of an Omaze house?
No. Capital Gains Tax is based on the taxable gain, not the full sale proceeds. HMRC's windfall guidance says a prize asset is treated as acquired at its market value when you receive it.
If I win a £4m house and sell it for £4m, do I pay CGT?
If £4m was also the genuine market value when you acquired it, there may be no capital gain before costs and reliefs. The exact valuation and sale costs still need to be supported.
What if I sell the house for less than its prize value?
A genuine sale below the tax acquisition value can create a capital loss. But the promoter's advertised prize value is not automatically proof of the open-market value, and Private Residence Relief can restrict losses on a home.
Can living in the house make the sale tax-free?
Private Residence Relief can reduce or remove CGT if the house genuinely becomes your only or main residence and the relevant conditions are met. There is no simple minimum stay that automatically guarantees full relief.
Can I deduct estate-agent fees from the gain?
Yes. HMRC says direct costs of selling property, including estate-agent and solicitor fees, can normally be deducted when working out the gain.
Can I deduct renovation costs?
Qualifying capital improvements that enhance the property and are reflected in it when sold can be deductible. Normal maintenance and decorating do not normally qualify as CGT enhancement expenditure.
How quickly do I have to report a taxable property gain?
For most UK residential property sales where CGT is due, a UK resident must report and pay the tax within 60 days of completion.
Does the same rule apply to Raffle House, BOTB and Elite Competitions?
The same UK CGT principles can apply to a house prize. The competition's own terms still matter for the ownership date, valuation evidence, cash alternatives and costs included with the prize.
Official sources
Where We Checked the Capital Gains Tax Rules
The tax rules on this page were checked against current HMRC and GOV.UK guidance. High-value property valuations and Private Residence Relief can be fact-specific, so use professional advice for a real sale.
- HMRC — windfalls and market value of prize assets ↗
- GOV.UK — working out the gain on property ↗
- GOV.UK — Private Residence Relief ↗
- HMRC — Private Residence Relief 2026 ↗
- GOV.UK — Capital Gains Tax rates ↗
- GOV.UK — reporting and paying CGT ↗
- GOV.UK — Capital Gains Tax records ↗
General information, not personal tax or legal advice. The CGT result depends on the property's genuine market value when acquired, how it was used, the ownership period, reliefs, other gains and losses, your taxable income and the sale costs. Last checked: 17 September 2026.