Want clarity on EIS CGT deferral?
EIS CGT deferral lets you postpone paying Capital Gains Tax by reinvesting your gain into a qualifying EIS company. With the right support from SEIS/EIS Advance Assurance specialists, you can structure these investments smoothly and avoid unexpected tax bills.
It gives you control over when a gain becomes taxable, which helps you plan your cash flow and protect more capital for growth. Many investors use EIS CGT deferral alongside other incentives such as income tax relief to create a more efficient overall tax position.
The rules can feel technical at first, particularly around the timing requirements and the events that bring a deferred gain back into charge. By breaking each part down clearly, you can see how the relief works in practice and where it fits into a long term investment strategy.
In this guide, you’ll learn:
- How EIS CGT deferral works from start to finish
- When you can defer a gain and how long the window lasts
- What triggers a deferred gain to become taxable again
- How EIS deferral compares with SEIS reinvestment relief
- How to make a claim with your EIS3 certificate
- Worked examples that show your potential CGT saving
Want clarity on EIS CGT deferral? Sleek can help.
What is EIS CGT deferral relief?
EIS CGT deferral relief lets you defer Capital Gains Tax on a gain you have already made by reinvesting that gain into qualifying EIS shares. This means you postpone the CGT bill until a later taxable event, rather than paying it in the year the gain was realised.
The relief applies whether the original gain came from property, shares, crypto or other chargeable assets. As long as the gain is reinvested within the EIS time limits, you can defer the full amount, even if you have already used your annual CGT allowance.
EIS CGT deferral is separate from the standard 30 percent EIS income tax relief. You can claim both if you meet the conditions. This combination is a common strategy for investors who want tax efficiency while supporting early stage UK companies.
The deferred gain is not cancelled. It is simply paused until a trigger event occurs. These events include selling your EIS shares, the company losing EIS status or changes in your UK tax residency. We explain these in detail later so you know exactly what to expect.
If you are new to EIS, it can help to understand the broader scheme first. Our guide on SEIS and EIS pitfalls gives useful background so you can spot the common mistakes investors make.
How does EIS CGT deferral relief work?
EIS CGT deferral relief works by allowing you to reinvest a capital gain into a qualifying EIS company within a set time window. When you do this, the CGT that would usually be due is postponed until a later event.
The investment window is flexible. You can reinvest a gain up to one year before it arises or up to three years after. This gives you room to plan around other financial commitments and choose the right company to invest in. You can also reinvest gains from multiple assets into one EIS investment if this suits your strategy.
Once the investment is made, your gain becomes deferred. It stays paused for as long as you continue to meet the EIS conditions. The deferred gain will only become taxable again when a trigger event happens. These triggers usually include selling your EIS shares or the company losing its EIS qualifying status.
You do not need to reinvest the entire disposal proceeds. Only the gain itself must be invested to secure deferral. This is helpful if you want to keep part of the proceeds in cash while still benefiting from EIS relief.
Understanding your wider tax position is important when deciding how much to reinvest. If you are managing several gains in one tax year, our guide on paying Corporation Tax when selling a business asset can help you see how different disposals interact with your overall planning.
EIS CGT deferral timeline and key rules
EIS CGT deferral relief depends on timing. The rules are straightforward once you break them down, and getting them right ensures your gain is fully deferred.
The EIS deferral window
You can defer a gain if you invest:
- Up to one year before the gain arises
- In the same tax year as the gain
- Up to three years after the gain arises
This four year span gives flexibility, especially if you are waiting for the right EIS opportunity or managing multiple asset disposals.
Minimum conditions you must meet
To secure EIS CGT deferral relief, you need to meet the following conditions:
- The company must be EIS qualifying at the time of investment
- You must receive and retain your EIS3 certificate
- You must invest the gain, not the total disposal proceeds
- Shares must be fully paid up in cash
- You cannot be connected to the company beyond permitted limits
If you are unsure whether a company still qualifies, our guide on EIS investment time limits explains what HMRC expects from both investors and companies.
Quick reference table: EIS CGT deferral rules
Rule | Summary |
Eligible gains | Any chargeable gain, including property, shares, crypto, and personal assets |
Percentage deferrable | Up to 100% of the gain invested |
Investment window | One year before to three years after the gain |
Holding period | Minimum three years from share issue |
Deferral duration | Until a trigger event occurs |
Max investment for deferral | No upper limit for CGT deferral |
Interaction with income tax relief | Both can be claimed on the same investment |
Why timing matters
The investment window determines whether your gain qualifies for deferral, but the three year holding period protects the relief. If you sell shares too early or the company loses EIS status, your deferred gain becomes taxable immediately.
Keeping track of these deadlines helps you avoid accidental clawbacks and keeps your investment tax efficient.
When deferred gains become taxable
A deferred gain is not cancelled. It becomes taxable again when a specific event triggers it. These events can happen years after the original investment, so it is important to keep track of your EIS shares and the company’s qualifying status.
Main events that trigger the deferred gain
Your deferred gain becomes taxable when:
- You sell or dispose of your EIS shares
Any disposal counts, including selling part of your holding. - The company loses its EIS qualifying status
This can happen if it stops trading, breaches the investment limits or fails to meet EIS conditions. - You cease to be UK tax resident
If you leave the UK within the three year qualifying period, the deferred gain is immediately chargeable. - You gift the shares (other than to a spouse or civil partner)
A gift counts as a disposal for EIS purposes. - The shares are redeemed or repaid
Any return of capital before the three year period triggers the deferred gain.
Keep a simple timeline of when your EIS shares were issued and when the three year period ends. A short reminder can help you avoid accidental disposals that bring the deferred gain back into charge unexpectedly.
What happens when a trigger event occurs
Once a trigger event happens, HMRC treats the original gain as arising at that point. The gain is taxed at the current CGT rates, not the rates that applied when you first made the disposal.
This means you might pay more or less depending on future tax changes. It also means the timing of selling your EIS shares can affect the final tax bill.
How this interacts with normal CGT rules
The deferred gain becomes chargeable before you apply your CGT annual allowance in the relevant year. It will also interact with any other disposals you make, which can affect your total tax position.
If you are preparing for a sale or a move abroad, our guide on tax obligations when running a business while employed can help you consider the wider tax impact of a trigger event.
EIS CGT deferral vs SEIS reinvestment relief
EIS CGT deferral and SEIS reinvestment relief both help investors manage Capital Gains Tax, but they work in different ways. Understanding the difference helps you choose the right strategy for your goals.
Key differences at a glance
Feature | EIS CGT Deferral | SEIS Reinvestment Relief |
Type of benefit | CGT deferred until a later event | CGT exempt on up to 50 percent of the gain |
Max investment for this relief | No limit for deferral | Linked to SEIS income tax relief cap (£200,000 per year) |
Holding period | Minimum 3 years | Minimum 3 years |
Time window | 1 year before to 3 years after gain | Gain and investment must be in same tax year unless carrying back |
Income tax relief required | Not required to defer gain | Must claim SEIS income tax relief |
Best suited for | Larger gains and flexible planning | Smaller gains where exemption saves more tax |
Which relief gives the bigger benefit?
- Large gains often benefit more from EIS deferral, because you can defer 100 percent with no upper limit.
- Smaller gains can benefit more from SEIS reinvestment relief, especially when the 50 percent exemption wipes out the CGT entirely.
Both reliefs can be used together in a long term investment strategy. The right mix depends on the size of your gain, your income tax position and the type of companies you prefer to back.
How they work together in real life
Many investors use SEIS for early stage, higher risk opportunities and EIS for later stage rounds. This blend gives both CGT exemption and CGT deferral, while spreading risk across different growth stages.
If you are comparing the two schemes for the first time, our guide on the difference between SEIS and EIS gives a clear overview of how each scheme operates.
Worked examples of EIS CGT deferral
Examples make it much easier to see how EIS CGT deferral relief works in practice. Below are simple scenarios that show how gains are deferred, when tax becomes payable and how the timing rules apply.
Example 1: Deferring the full gain
You sell a rental property and realise a £60,000 gain. You reinvest the full £60,000 into EIS shares within the allowed time window.
- Amount invested: £60,000
- CGT deferred: £60,000
- CGT rate avoided today: 24 percent (higher rate property)
- Immediate tax saving: £14,400 postponed, not cancelled
The gain stays deferred until you sell the EIS shares or another trigger event occurs.
Example 2: Deferring part of a gain
You sell listed shares and realise a £40,000 gain. You choose to invest only £25,000 into EIS shares.
- Amount invested: £25,000
- CGT deferred: £25,000
- Remaining gain taxable now: £15,000
Partial deferral is common if you want liquidity while still accessing EIS benefits.
Example 3: Trigger event after the holding period
You realise a £100,000 gain in 2024 and reinvest it into EIS shares in 2025. You hold the shares for three years, then sell them in 2028.
- Deferred gain becomes taxable in 2028
- CGT applied at 2028 rates
- Any profit on the EIS shares is tax free if you qualified for EIS income tax relief
This shows how deferral shifts the timing of the CGT rather than reducing the underlying gain.
Example 4: Losing EIS status
You invest £30,000 of gains into EIS shares. Two years later, the company stops meeting EIS requirements.
- Deferred gain: £30,000
- Gain becomes taxable immediately
- Tax applied at current CGT rates
Changes in company status are rare but possible, so it is wise to monitor your investment.
If you are juggling multiple gains in one year, use EIS for larger gains and keep your annual CGT allowance for smaller disposals. Our guide ontax relief in the UK shows other reliefs that can work alongside EIS for a smoother tax position.
How to claim EIS CGT deferral relief
Claiming EIS CGT deferral relief is straightforward once you have the right paperwork and understand which boxes to tick. The key document is your EIS3 certificate, which confirms that your investment qualifies.
Step 1: Get your EIS3 certificate
After you invest in an EIS qualifying company, the company applies to HMRC for approval. Once HMRC agrees, the company sends you an EIS3 certificate.
You need this certificate before you can claim either income tax relief or CGT deferral relief. Keep it safe, as HMRC may ask to see the original.
Step 2: Decide which gain you are deferring
Identify the specific gain, or gains, you want to defer. Make sure:
- The gain falls within the EIS deferral window
- You have invested an amount at least equal to the gain you want to defer
- You are UK resident for the relevant periods
If you are managing several gains at once, it can help to map them on a single timeline alongside your EIS subscriptions.
Step 3: Complete the EIS3 claim section
On your EIS3, there is a section for Capital Gains Tax deferral relief. Here you will:
- Enter details of the asset disposed of
- State the amount of gain to be deferred
- Confirm the date of the disposal
- Cross-refer to your tax return where needed
This is separate from the section used to claim income tax relief.
Step 4: Include the claim in your Self Assessment tax return
You normally claim EIS CGT deferral through your Self Assessment tax return.
You will:
- Use the Capital Gains Tax summary pages
- Show the original disposal and note that the gain is deferred
- Attach or retain the EIS3 with your records
HMRC’s helpsheet HS297 Capital Gains Tax and Enterprise Investment Scheme explains how deferral relief works from a compliance perspective.
Step 5: Check the claim deadline
You usually have up to five years from the 31 January following the end of the tax year in which the shares were issued to make your claim.
Missing this window can mean losing relief, so it is worth noting the deadline as soon as you receive your EIS3.
Step 6: Keep clear records
Keep a simple record of:
- The asset you sold
- Date of disposal
- Gain deferred
- Date EIS shares were issued
- Any later trigger events
Good record keeping makes it easier to complete future returns when the deferred gain eventually becomes chargeable.
If this feels like a lot to juggle on top of running a business, you do not have to handle it alone. A dedicated tax accountant can manage your EIS claims, track deadlines and make sure your CGT deferral is reported correctly.
Staying on top of EIS CGT deferral with Sleek
Once you understand how EIS CGT deferral works, the relief becomes a powerful tool for managing your tax position and supporting high growth companies. The challenge is keeping track of deadlines, paperwork and future trigger events while also running your business.
Sleek makes this simpler. Your dedicated accountant manages your records, tracks the qualifying periods and prepares your Self Assessment so your deferred gains are reported correctly. You will always know what is due, when it is due and how your investments affect your wider tax position.
This support sits alongside our wider filing and advisory services, from bookkeeping to VAT and payroll, which keeps your finances organised and compliant year round.
Ready to make EIS deferral easier to manage? Speak to Sleek’s experts and stay in control of your tax planning.
FAQs on EIS CGT deferral
How much gain can I defer with EIS?
You can defer up to 100 percent of any chargeable gain, with no upper limit. The gain must fall within the EIS investment window and you must invest at least the value of the gain into qualifying EIS shares.
How long can you defer Capital Gains Tax under EIS?
Your gain stays deferred until a trigger event occurs. This could be the sale of your EIS shares, the company losing its qualifying status or you ceasing to be a UK tax resident. There is no fixed end date if no trigger event arises.
Can I claim EIS income tax relief and CGT deferral at the same time?
Yes. You can claim both on the same investment if you meet the conditions. This is a common strategy to maximise tax efficiency and reduce the overall cost of investing in early stage companies.
What happens if I sell my EIS shares early?
Selling within the three year holding period makes the deferred gain taxable immediately. It may also claw back any EIS income tax relief claimed. Our guide on HMRC Companies House fines explains how HMRC deals with compliance issues.
Can non-UK residents use EIS CGT deferral?
You must be a UK resident at the time of making the claim. If you later leave the UK within the three year qualifying period, the deferred gain becomes taxable immediately.
Is EIS CGT deferral better than SEIS reinvestment relief?
Neither is universally better. SEIS can exempt up to 50 percent of the gain, which is ideal for smaller amounts. EIS allows complete deferral with no limit, which suits larger gains. Many investors use both as part of a balanced tax strategy.
Do I need to report the deferred gain every year?
No. You only report the original disposal in the year you claim the deferral. The gain becomes reportable again only when a trigger event occurs. If you are filing for the first time, our step by step guide on how to file a Self Assessment tax return can help you prepare.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
