Downsizing — selling a larger family home and buying somewhere smaller — is one of the most significant financial transactions you'll ever make. Done well, it releases substantial equity that can fund your retirement, reduce maintenance costs, and simplify your life. But Stamp Duty, moving costs, and tax-efficient deployment of the proceeds all need careful planning.
Capital Gains Tax: the good news
If the property you're selling is your main residence and has been throughout the period you owned it, Principal Private Residence Relief (PPR) exempts you from Capital Gains Tax entirely. It doesn't matter if the property has increased in value by £50,000 or £500,000 — no CGT is due.
This is one of the most valuable tax reliefs in the UK system. A £300,000 gain on a property that would otherwise attract 24% CGT (for higher-rate taxpayers) would cost £72,000 in tax. PPR makes that zero.
When PPR doesn't fully apply
PPR may be partially restricted if:
- You let part of the property (e.g., a lodger in a self-contained annex) — Letting Relief may cover up to £40,000 of the gain
- You used part exclusively for business (a dedicated home office that was never used for anything else)
- You were absent for periods not covered by the relief (the last 9 months of ownership are always exempt)
- You own a second property and haven't nominated this one as your main residence
For most downsizers selling a straightforward family home, full PPR applies and no CGT return is needed.
Stamp Duty on your next purchase
This is the main tax cost of downsizing. Stamp Duty Land Tax (SDLT) in England and Northern Ireland is charged on the purchase price of your replacement property:
- Up to £125,000: 0%
- £125,001 to £250,000: 2%
- £250,001 to £925,000: 5%
- £925,001 to £1.5 million: 10%
- Over £1.5 million: 12%
On a £300,000 replacement property, you'd pay £2,500 in SDLT. On £400,000, it's £7,500. This is an unavoidable cost of moving — factor it into your equity release calculations.
Note: If you haven't sold your existing home before completing on the new one, you'll pay the 5% additional property surcharge temporarily. You can reclaim this within 36 months if you sell the original property.
What to do with freed-up equity
If you sell for £600,000 and buy for £350,000, you have roughly £225,000 after Stamp Duty (£5,000) and moving costs (~£20,000 including estate agent fees, solicitor, and removals). Here's how to deploy it tax-efficiently:
Pension contributions
If you have earnings, you can contribute up to £60,000/year to a pension (plus carry forward from previous years). A £60,000 contribution from a higher-rate taxpayer saves £24,000 in income tax immediately. Over three years using carry forward, you could shelter up to £180,000+ in a pension. See our pension carry forward guide.
ISA contributions
£20,000/year per person (£40,000 for a couple) into Stocks & Shares ISAs. All growth is tax-free, and withdrawals are unrestricted. Over five years, a couple could shelter £200,000 in ISAs — enough to provide a tax-free income bridge before pensions become accessible. See our ISA guide.
Gifts to children
You can gift any amount, but gifts above the annual exemption (£3,000/year) are Potentially Exempt Transfers (PETs) for IHT purposes. Survive seven years and the gift is fully exempt. Regular gifts from surplus income are immediately exempt if they don't affect your standard of living.
Inheritance Tax planning
Downsizing can affect your Residence Nil-Rate Band (RNRB). The RNRB (£175,000 in 2026/27) only applies if you leave a residence to direct descendants. If you downsize to a property worth less than £175,000, you may lose some RNRB. However, a “downsizing addition” rule preserves the RNRB if you downsize after July 2015 and leave equivalent assets to direct descendants.
A couple can potentially pass on up to £1 million IHT-free (£325,000 + £175,000 each = £1 million combined). Downsizing doesn't jeopardise this if you leave the proceeds to your children. See our inheritance tax guide for the full picture.
The emotional vs financial calculation
Moving costs (estate agent at 1–1.5%, solicitor £1,500–£3,000, surveyor £500–£1,000, removals £1,000–£3,000, Stamp Duty) typically total 3–5% of the sale price. On a £600,000 sale, that's £18,000–£30,000 in transaction costs alone. You need to release meaningful equity to make downsizing financially worthwhile — a small move (e.g., from a £400,000 to a £350,000 property) may not justify the costs.
Calculate your position
Use the income tax calculator to check what tax relief you'd get on pension contributions from your freed-up equity. If you're a higher-rate taxpayer, the savings are substantial.