EIS Income Tax Relief: How to Claim 30% Back on Your Investment

The Enterprise Investment Scheme (EIS) gives UK taxpayers a direct reduction in their income tax bill when they invest in qualifying companies. The relief is worth 30% of the amount invested — meaning for every pound you put into an EIS-qualifying company, HMRC effectively contributes 30p by reducing your tax.

This guide covers how EIS income tax relief works in practice, exactly how to claim it, and what happens if things do not go to plan.

How the 30% Income Tax Relief Works

When you subscribe for new shares in a company that holds EIS qualifying status, you are entitled to claim income tax relief equal to 30% of the amount you invested. The relief is a tax reducer — it comes off your income tax bill directly, not off your taxable income.

There are two important distinctions here:

• Tax reducer vs tax deduction. A tax deduction reduces your taxable income, and the tax saving depends on your marginal rate. A tax reducer comes straight off the tax you owe, pound for pound. EIS income tax relief is a reducer — it is worth 30p per pound invested regardless of whether you pay 20%, 40%, or 45% income tax.
• Cannot create a refund on its own. EIS relief can reduce your income tax liability to zero, but it cannot go below zero. If you do not have enough income tax liability to absorb the full relief, the excess is lost (unless you carry back to the prior year).

Annual Investment Limits

The standard annual limit is £1,000,000 of EIS investment qualifying for relief, giving a maximum reduction of £300,000 per tax year.

Since the Finance Act 2018, an additional allowance applies for knowledge-intensive companies (KICs). If your investments above the £1,000,000 standard limit are in KICs, you can invest up to £2,000,000 in total, giving potential relief of £600,000 per tax year. A knowledge-intensive company is one that meets specific conditions around research and development expenditure or innovation — typically spending at least 15% of operating costs on R&D, or 10% if it also has a patent or similar intellectual property.

Timing: When Relief Is Due

Income tax relief applies for the tax year in which the shares are issued to you, not the year you transferred the money. If you send funds in March but shares are not formally issued until May, the relief falls in the following tax year.

This distinction matters for tax planning, particularly around the 5 April year-end.

Step-by-Step: How to Claim EIS Income Tax Relief

Step 1: Receive Your EIS3 Certificate

After the company has been trading for at least four months (and has spent at least 70% of the funds raised), it applies to HMRC for a compliance statement. If HMRC is satisfied, it authorises the company to issue EIS3 certificates to each investor.

You cannot claim relief without the EIS3 certificate. The company cannot issue it without HMRC’s compliance approval. This is why advance assurance matters — it gives you early confidence that the company is likely to qualify, even though the formal EIS3 comes later.

Step 2: Complete Your Self Assessment Tax Return

On your tax return, you enter the EIS3 details on the Additional Information pages (SA101). The key fields are:

• The name of the company
• The amount invested
• The date the shares were issued
• The unique EIS3 reference number

If you file online, the system calculates the relief automatically. If you file on paper, you calculate the 30% reduction yourself and enter it in the tax reducers section.

Step 3: If You Are Not Registered for Self Assessment

If you are a PAYE taxpayer who does not normally file a tax return, you can claim EIS relief by writing to HMRC. Send the EIS3 certificate with a letter explaining the claim. HMRC will adjust your tax code or issue a repayment.

Step 4: Receive the Tax Reduction

If your Self Assessment calculation shows a repayment due, HMRC will send the money to you (usually within 4 to 8 weeks of processing). If you owe tax, the relief reduces the amount payable.

Carrying Back EIS Relief to the Previous Tax Year

One of the most useful features of EIS income tax relief is the ability to carry back all or part of your investment to the previous tax year. This means shares issued in 2026/27 can be treated as though the investment was made in 2025/26.

Why Carry Back?

Carry back is valuable in several situations:

• You had a higher income tax bill in the previous year (perhaps a bonus, dividend, or property sale).
• You have already used your current year’s EIS allowance.
• You want the cash repayment sooner, since the prior year’s return may already be filed and a repayment can be processed quickly.

How to Elect for Carry Back

You make the election on your Self Assessment return for the year the shares were actually issued. You specify the amount you wish to carry back. The carried-back investment counts against the previous year’s annual limit, not the current year’s.

Example: Sarah invests £200,000 in an EIS company in June 2026 (tax year 2026/27). She had a large bonus in 2025/26 and wants to offset some of that liability. She elects to carry back £150,000 to 2025/26. The relief splits as follows:

	2025/26 (carry back)	2026/27 (current year)
Investment allocated	£150,000	£50,000
Income tax relief (30%)	£45,000	£15,000
Counts against annual limit	2025/26 limit	2026/27 limit

Sarah’s total relief is £60,000. She amends her 2025/26 return to claim the £45,000, and claims £15,000 on her 2026/27 return.

Time Limits

The carry-back election must be made within the time limit for amending the tax return for the year of share issue. For a 2026/27 investment, that means the election must be made by 31 January 2029 (the filing deadline for 2026/27 plus the amendment window).

Knowledge-Intensive Companies: The Higher Limit

Since 2018, investors can claim EIS income tax relief on up to £2,000,000 per year, provided the amount above £1,000,000 is invested in knowledge-intensive companies. This was introduced to direct more capital toward R&D-heavy businesses.

A company qualifies as knowledge-intensive if it meets one of two conditions:

1. The innovation condition: at least 15% of operating costs are spent on research, development, or innovation in each of the three years before the share issue (or 10% if less than three years old).
2. The skilled employee condition: at least 20% of the workforce holds a relevant master’s or doctoral degree, and the company has spent at least 10% of operating costs on R&D.

The company must also have fewer than 500 employees and gross assets of no more than £15 million.

Example: Tom invests £1,500,000 — £1,000,000 in a standard EIS company and £500,000 in a KIC biotech firm. His total relief is £450,000 (30% of £1,500,000). Without the KIC allowance, his relief would have been capped at £300,000.

Married Couples and Civil Partners

Each person has their own separate annual investment limit. Unlike some allowances, EIS limits are individual, not household-based.

A married couple can therefore invest a combined £2,000,000 per year (£1,000,000 each) in standard EIS companies, claiming combined relief of £600,000. If both use the knowledge-intensive allowance, the household total rises to £4,000,000 invested with £1,200,000 in relief.

Each spouse claims the relief on their own tax return, against their own income tax liability. The investment must be made by that individual — you cannot claim relief on shares your spouse purchased.

For couples where one partner has a significantly higher income tax liability, it may be more effective for that partner to make the investment, since EIS relief can only reduce tax to zero, not create a repayment beyond what is owed.

What Happens If You Sell Before 3 Years: The Clawback

EIS income tax relief is conditional on holding the shares for a minimum period — generally 3 years from the date the shares were issued (or 3 years from the date the company commenced its qualifying trade, if later).

If you dispose of the shares before this period ends, HMRC will claw back some or all of the income tax relief you received.

How the Clawback Is Calculated

The clawback amount depends on what you receive for the shares:

• Sale at or above the amount subscribed: The full 30% relief is clawed back. You repay the entire income tax reduction.
• Sale at a loss: The clawback is 30% of the sale proceeds, not 30% of the original investment. This means you keep part of the relief.

Example: James invested £100,000 and received £30,000 income tax relief. After 18 months, he sells the shares for £40,000. The clawback is 30% of £40,000 = £12,000. He keeps £18,000 of the original relief. His net position: received £40,000 sale proceeds plus £18,000 retained relief = £58,000 recovered from a £100,000 investment.

If James had sold for £100,000 or more, he would repay the full £30,000 relief.

What Counts as a Disposal

A disposal includes selling shares, gifting them, or certain corporate events such as a buyback. It does not normally include a share-for-share exchange in a takeover, provided conditions are met. Death is not a disposal for clawback purposes — the relief is retained.

Interaction with Other Tax Reliefs

EIS income tax relief interacts with several other parts of the tax system:

CGT Deferral Relief

EIS income tax relief and CGT deferral relief are separate claims and can both apply to the same investment. You can invest a capital gain into EIS shares, defer the original gain, and claim 30% income tax relief — provided the investment qualifies for both.

SEIS and EIS in the Same Year

You can claim both SEIS and EIS relief in the same tax year. The SEIS limit (£200,000 at 50% relief) is separate from the EIS limit. An investor could claim up to £100,000 SEIS relief and £300,000 EIS relief in the same year — a combined £400,000 tax reduction.

Pension Annual Allowance

EIS investments do not count toward your pension annual allowance and are not affected by the tapered annual allowance. For higher earners whose pension contributions are restricted, EIS can be a complementary way to invest tax-efficiently.

Loss Relief

If the company fails after the three-year holding period, you can claim loss relief. The allowable loss is the investment minus the income tax relief received (since you already had that benefit). This loss can be set against income tax or capital gains tax, at your choice. Against income tax, the relief is at your marginal rate, which for additional rate taxpayers means recovering 45% of the allowable loss.

Worked Example: Full Tax Position

Rachel is an additional rate taxpayer (45%) who invests £200,000 in an EIS-qualifying technology company.

Year 1 — Investment and relief claim:

• Investment: £200,000
• Income tax relief claimed (30%): £60,000
• Effective cost of investment: £140,000

Year 5 — Company acquired, shares sold for £500,000:

• Gain on disposal: £300,000 (£500,000 minus £200,000)
• CGT on gain: £0 (exempt — shares held for 3+ years)
• Total return: £500,000 sale proceeds + £60,000 tax relief = £560,000 on a £200,000 investment

Alternative scenario — Company fails, shares worth £0:

• Allowable loss: £140,000 (£200,000 minus £60,000 relief)
• Loss relief against income (at 45%): £63,000
• Total recovered: £60,000 income tax relief + £63,000 loss relief = £123,000
• Net loss: £77,000 on a £200,000 investment (effective loss of 38.5p per pound)

Even in the worst case, the combination of income tax relief and loss relief means the investor loses substantially less than the full amount invested.

Common Mistakes When Claiming EIS Income Tax Relief

1. Claiming before receiving the EIS3 certificate. You must wait for the company to obtain HMRC compliance and issue the certificate. Filing your return with estimated EIS figures is not acceptable.

2. Exceeding the annual limit without the KIC allowance. If you invest more than £1,000,000 and the excess is not in a knowledge-intensive company, you simply lose the relief on the excess — there is no error, you just cannot claim it.

3. Forgetting to carry back. If your current year tax liability is lower than your relief entitlement, carry back can rescue the surplus. Investors who do not consider this leave money on the table.

4. Not checking connected party rules. You cannot claim EIS relief if you are connected to the company — broadly, if you hold more than 30% of the shares, voting rights, or assets on a winding up, or if you are an employee (directors who are not employees are generally permitted).

5. Disposing of shares without realising it triggers clawback. Share buybacks, reorganisations, or informal transfers can count as disposals. Always take advice before any transaction involving EIS shares within the holding period.

Summary

EIS income tax relief is a straightforward but powerful mechanism: invest in qualifying companies, claim 30% back from HMRC, and hold for three years to lock in the benefit. The carry-back provision adds flexibility, the knowledge-intensive allowance extends the limit for R&D-focused investments, and the interaction with other reliefs (CGT exemption, deferral, loss relief) makes EIS one of the most tax-efficient investment structures available to UK taxpayers.

The key administrative step is obtaining the EIS3 certificate from the company. Without it, no claim can be made. For founders, securing advance assurance before fundraising gives investors confidence that the certificate will eventually be issued — and removes the biggest friction point in closing an EIS round.