Selling to Family: Downsizing Within the Family
Selling below market value doesn't avoid tax — HMRC generally treats the transaction as if it happened at full market value for both Stamp Duty and Capital Gains Tax purposes, regardless of the price actually paid. The "discount" itself can also be treated as a gift for inheritance tax purposes.
Selling your home to a family member — often at a reduced price — can be an appealing way to downsize while keeping the property in the family. But it has real tax implications on both sides that are easy to overlook. This guide explains what actually happens.
How HMRC Treats a Below-Market Sale
If you sell your home to a family member for less than it's worth, HMRC doesn't simply accept the lower price for tax purposes. Two separate things happen:
Stamp Duty Land Tax is generally still calculated on the property's true market value, not the discounted price actually paid — meaning your family member could owe more SDLT than the price they paid would suggest
The difference between market value and the price paid is generally treated as a gift from you to them — relevant for inheritance tax if you don't survive 7 years from the sale
Capital Gains Tax Considerations
If the property being sold is your main residence, Private Residence Relief generally means no Capital Gains Tax is due on the sale, regardless of price — this is one of the more favourable aspects of selling to family, provided it genuinely was your only or main home throughout ownership.
If the property was ever let out, used as a second home, or otherwise doesn't qualify for full relief, CGT could apply on the gain — calculated using the property's market value, not the discounted price, since connected-person transactions use market value for CGT regardless of what was actually paid.
The Inheritance Tax Angle
The gifted portion (market value minus price paid) is treated as a Potentially Exempt Transfer, same as any other gift:
If you survive 7 years from the sale, the gifted value falls outside your estate entirely for IHT purposes
If you die within 7 years, the gifted value may be added back into your estate, with taper relief reducing the tax rate (not the value) from year 3 onwards
One important complication: if you continue living in the property after selling it below market value, HMRC's "Gift with Reservation of Benefit" rules can apply — meaning the gifted portion stays in your estate for tax purposes regardless of the 7-year rule, unless you pay full market rent for your continued occupation. This is a common trap worth getting specific advice on.
Practical Considerations Beyond Tax
Beyond the tax mechanics, worth thinking through:
Whether your family member needs a mortgage to complete the purchase, and whether lenders accept below-market-value transactions (many do, treating the discount as a deposit — but terms vary by lender)
Getting an independent valuation to establish genuine market value, since HMRC can challenge an unrealistically low figure
Using a solicitor for both parties, or at minimum independent conveyancing advice for each side, to avoid conflicts of interest
Whether other family members might view the arrangement as unequal, and how to address this openly if relevant
Getting This Right
Selling to family can be a genuinely effective way to downsize while keeping a property in the family — but the tax mechanics are more involved than a simple private sale, and mistakes (particularly around continuing to live in the property) can undo the intended benefit. A solicitor experienced in this specific type of transaction, alongside tax advice if the numbers are significant, is worth the cost.
See our downsizing guide for the broader process, or our guide on gifting money to family for how the wider gifting rules interact with this.
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