Capital Gains Tax sits in an awkward part of the tax system for a lot of households. It is not an everyday payroll tax like income tax, but it is also not a niche issue affecting only sophisticated investors. Anyone selling shares outside an ISA, disposing of a second property, realising gains on a business sale, or planning around tax-efficient investing can end up in scope. And because disposals are often one-off events, many people only look into the rules when a deadline or tax bill is already close.
This hub is the main PocketWise starting point for Capital Gains Tax. It brings together the current rates and allowance, property-specific rules, share-investing rules, calculators, reliefs and the main planning levers people use to reduce CGT legally.
For the wider tax picture, return to the main Tax section. If your question is more about wrappers and investment structure, also use the ISAs hub. If the issue is reporting gains through HMRC or broader return obligations, use the Self-Assessment hub.
What Capital Gains Tax actually applies to
CGT is charged on gains made when you dispose of assets that have increased in value. The key word is gain rather than sale price. What matters is the difference between your disposal proceeds and your allowable cost base, after taking account of allowable expenses, losses, reliefs and the annual exempt amount.
In practice, the main asset groups readers care about are:
- residential property that is not fully covered by main-residence relief
- shares, funds and other investments held outside ISAs and pensions
- business assets or company shares that may qualify for special relief
- other taxable assets where a disposal creates a reportable gain
That is why this cluster matters. People rarely search for CGT in a purely abstract way. They search because they are selling something specific.
Capital gains tax at a glance
| Topic | Main question | Best starting guide |
|---|---|---|
| Core overview | How does CGT work in the UK? | Capital Gains Tax Guide |
| Allowance and rates | What is tax-free and what rates apply? | CGT Allowance 2026/27 |
| Estimated bill | How much tax might you owe? | Capital Gains Tax Calculator |
| Property disposals | How does CGT work on second homes or buy-to-let? | CGT on Property |
| Specific second-home sale | What happens on a second-property disposal? | CGT on Second Homes |
| Shares and funds | What happens when you sell investments? | CGT on Shares |
| Reduction strategies | How can you reduce CGT legally? | How to Reduce CGT |
| Business sale relief | Can BADR reduce the rate? | Business Asset Disposal Relief |
A practical decision framework
The cleanest way to approach CGT is to start from the asset type and the real planning problem.
| Your situation | Best first move | Next read |
|---|---|---|
| You just want the overall rules | Start with the main overview and rates | Capital Gains Tax Guide |
| You need a quick estimate | Use the calculator and allowance page together | Capital Gains Tax Calculator |
| You are selling a second home, buy-to-let or inherited property | Use the property-specific CGT path | CGT on Property |
| You are selling shares or funds outside wrappers | Use the investment-specific path | CGT on Shares |
| You think you may be able to cut the bill legally | Check the planning strategies before disposal | How to Reduce CGT |
| You are selling a business or company shares | Check BADR early because the conditions matter | Business Asset Disposal Relief |
That decision order matters because the rates, reliefs, reporting rules and planning options vary a lot depending on what is being sold. A property seller, a share investor and a business owner may all say they have a CGT issue, but they do not have the same route through the rules.
The allowance matters more than it used to
One of the biggest shifts in the CGT landscape is the collapse in the annual exempt amount. The allowance used to shield a much larger amount of gains. With the exempt amount now far lower than in earlier years, many more households and investors have become exposed to CGT on disposals that would once have sat comfortably below the threshold.
This is why the allowance page has become central rather than secondary:
In practical terms, a smaller allowance means three things:
- more disposals become taxable
- annual planning matters more
- wrappers like ISAs and pensions become even more valuable for future gains
That is also why the CGT cluster naturally overlaps with PocketWise pages on ISAs and tax-efficient investing.
Property gains are their own sub-cluster
Property is where many readers first encounter CGT in a serious way. A second home, buy-to-let property, inherited home or former main residence can create a taxable gain, and the rules are not the same as for selling ordinary investments.
The property sub-cluster here is:
- Capital Gains Tax on Property
- Capital Gains Tax on Selling a Second Home or Property
- Property Tax Guide
The practical issues readers usually need help with are:
- whether the property qualifies for main-residence relief
- how to calculate the chargeable gain after purchase costs, selling costs and improvements
- the special reporting and payment deadlines for residential property disposals
- how second homes and buy-to-let properties differ from a main home
This is one of the clearest reasons the hub structure matters. Property sellers do not just need the headline CGT rate. They need the disposal-specific workflow.
Shares, wrappers and tax-efficient investing
For investors, CGT is usually about selling shares, funds or ETFs held outside tax wrappers. In this part of the system, the real planning question is often less about a single disposal and more about how to structure investing over time.
Use these pages together:
- Capital Gains Tax on Shares
- How to Reduce Capital Gains Tax
- Capital Gains Tax Allowance 2026/27
- ISAs hub
This is where ideas such as using the annual exempt amount, moving assets into an ISA over time, and coordinating gains between spouses or civil partners become much more important. The smaller allowance means these strategies have become practical necessities rather than optional fine-tuning.
The calculator is useful, but context matters
The CGT calculator is a valuable starting point, but it is only as good as the assumptions you feed into it. Many people underestimate how much the result depends on:
- whether the asset is residential property or another asset type
- what counts as allowable cost and allowable improvement expenditure
- whether any losses can be offset
- whether a relief or special rate applies
- how much of the gain sits inside the basic-rate band once income is considered
That is why the Capital Gains Tax Calculator works best alongside the main overview and the property or shares guides rather than on its own.
Reliefs and legal ways to reduce CGT
The strongest planning content in this cluster sits around lawful ways to reduce the bill. That is usually what people actually mean when they ask how to “avoid” CGT. In most legitimate cases, the real answer is not avoidance but reliefs, allowances, wrapper use, timing and loss management.
Start here:
For many households, the main levers are:
- using the annual exempt amount rather than wasting it
- using spouse transfers where appropriate
- sheltering assets in ISAs and pensions before future gains build up
- offsetting losses correctly
- understanding when a business disposal qualifies for BADR
For business owners, BADR deserves its own route because the qualifying conditions matter at least as much as the rate itself. It is not a general relief for anyone selling anything business-related. It is a specific relief with ownership, office/employment and business-activity conditions that should be checked early.
Reporting, deadlines and HMRC interaction
A CGT issue is often also a reporting issue. Residential property disposals can trigger short reporting and payment deadlines, while wider gains may need to be reflected through Self Assessment depending on the circumstances.
That makes these cross-links important:
Readers do not just want to know the tax amount. They want to know when HMRC expects to hear about it and through which route.
The core capital gains cluster
- Capital Gains Tax Guide
- Capital Gains Tax Allowance 2026/27
- Capital Gains Tax Calculator
- Capital Gains Tax on Property
- Capital Gains Tax on Selling a Second Home or Property
- Capital Gains Tax on Shares
- How to Reduce Capital Gains Tax
- Business Asset Disposal Relief
- Property Tax Guide
FAQ
What is the main Capital Gains Tax allowance now?
The annual exempt amount is much smaller than it used to be, which is why many more disposals now fall into charge. The allowance page is the best place to start for the current threshold.
Do you always pay CGT when you sell a property?
No. A main home may be fully or largely exempt, while second homes, buy-to-let properties and some inherited-property disposals often create taxable gains.
Are shares taxed the same way as property?
Not exactly. The broad CGT framework is similar, but property disposals have their own relief and reporting context, while share disposals are more closely tied to wrappers, annual planning and portfolio management.
Is there a legal way to reduce CGT?
Yes. The main route is through lawful planning using allowances, losses, spouse transfers, wrappers like ISAs and pensions, and reliefs such as BADR where the conditions are met.
Where should I start if I need a fast answer?
Start with the calculator and the allowance page, then move to the relevant asset-specific guide for property, shares or business disposals.