EIS Loss Relief: How to Claim and Calculate Your Allowable Loss

Every investor who backs early-stage companies knows that some investments will fail. The Enterprise Investment Scheme (EIS) does not prevent losses, but it substantially reduces them. Loss relief is the third pillar of EIS tax benefits — after income tax relief and CGT exemption — and it is the one that matters most when things go wrong.

This guide covers the mechanics of EIS loss relief, how to calculate it, when to claim against income tax versus capital gains tax, and the mistakes that cost investors money.

How EIS Loss Relief Works

When you dispose of EIS shares at a loss — whether because the company has failed, gone into administration, or you sell for less than you paid — you can claim tax relief on that loss. The relief works by allowing you to offset the loss against your tax liability, effectively getting money back from HMRC.

The critical point is that EIS loss relief is not simply a capital loss. Unlike ordinary share losses, which can only be offset against capital gains, EIS losses can be offset against income tax. This is significant because income tax rates (up to 45%) are typically higher than capital gains tax rates (20% for higher-rate taxpayers).

The legal basis is found in sections 131 to 135 of the Income Tax Act 2007 and sections 150A to 150C of the Taxation of Chargeable Gains Act 1992.

The Calculation Method

The formula for calculating an EIS allowable loss is straightforward:

Allowable loss = Amount subscribed - Disposal proceeds - Income tax relief received and retained

If the company has failed entirely and the shares are worthless, the disposal proceeds are nil. If you sold at a reduced price, you use the actual proceeds.

The deduction for income tax relief reflects the fact that you have already received a tax benefit on that portion of your investment. Without this adjustment, you would effectively receive tax relief twice on the same money.

Important: Only Relief “Received and Retained” Is Deducted

If any of your income tax relief was clawed back (for example, because you disposed of shares within the 3-year holding period, or because value was received from the company), the clawed-back amount is not deducted. You only reduce the allowable loss by relief you actually kept.

Worked Example 1: Total Loss for a 45% Taxpayer

Sarah invests £100,000 in an EIS-qualifying company. She claims and receives £30,000 in income tax relief (30% of £100,000). Three years later, the company goes into administration. The shares are worth nothing.

Calculating the allowable loss:

• Amount subscribed: £100,000
• Disposal proceeds: £0
• Income tax relief retained: £30,000
• Allowable loss: £100,000 - £0 - £30,000 = £70,000

Offsetting against income tax (at 45%):

• Tax recovered: £70,000 x 45% = £31,500

Sarah’s total position:

• Invested: £100,000
• Income tax relief received: £30,000
• Loss relief recovered: £31,500
• Net cost of the failed investment: £38,500
• Effective loss rate: 38.5p per pound invested

Sarah invested £100,000 and lost £38,500. The combined EIS reliefs absorbed 61.5% of the loss.

Worked Example 2: Partial Loss for a 40% Taxpayer

James invests £60,000 in an EIS company and claims £18,000 income tax relief. After four years, the company is struggling and he sells his shares for £15,000.

Calculating the allowable loss:

• Amount subscribed: £60,000
• Disposal proceeds: £15,000
• Income tax relief retained: £18,000
• Allowable loss: £60,000 - £15,000 - £18,000 = £27,000

Offsetting against income tax (at 40%):

• Tax recovered: £27,000 x 40% = £10,800

James’s total position:

• Invested: £60,000
• Sale proceeds received: £15,000
• Income tax relief received: £18,000
• Loss relief recovered: £10,800
• Net cost: £60,000 - £15,000 - £18,000 - £10,800 = £16,200
• Effective loss rate: 27p per pound invested

Because James received some proceeds from the sale, his effective downside is even lower than in a total loss scenario.

Worked Example 3: Choosing Between Income Tax and CGT Offset

Rachel invests £80,000 in an EIS company and claims £24,000 income tax relief. The company fails. Her allowable loss is £56,000 (£80,000 - £0 - £24,000).

Rachel has two options:

Option A — Offset against income tax at 45%:

• Recovery: £56,000 x 45% = £25,200

Option B — Offset against capital gains at 20%:

• Recovery: £56,000 x 20% = £11,200

Option A recovers £14,000 more. For Rachel, income tax offset is clearly the better choice.

However, if Rachel were a basic-rate taxpayer at 20% with £80,000 of realised capital gains, both options would yield £11,200 — and the CGT offset might be preferable if she expected her income tax rate to remain low but had immediate gains to shelter.

Rule of thumb: If your marginal income tax rate exceeds 20%, offset against income tax. If you are a basic-rate taxpayer with significant capital gains, consider CGT offset.

Time Limits for Claiming

EIS loss relief must be claimed within specific time limits:

For income tax offset:

• The loss must be claimed within 4 years of the end of the tax year in which the disposal (or deemed disposal) occurs.
• The loss can be set against income of the tax year of the loss or the previous tax year. You choose which year to offset against.

For CGT offset:

• Standard capital loss rules apply. The loss is set against gains in the same tax year first, then carried forward indefinitely.
• The claim must be made within 4 years of the end of the tax year of disposal.

Negligible value claims:

• If the company has not formally wound up but the shares are effectively worthless, you can make a negligible value claim under section 24(2) of the Taxation of Chargeable Gains Act 1992. This treats the shares as disposed of and immediately reacquired at negligible value, crystallising the loss.
• You can backdate the claim to an earlier date if the shares were already of negligible value at that time, provided the claim is made within 2 years of the end of the tax year to which you want to backdate.

Loss Relief and the 3-Year Holding Period

The interaction between loss relief and the minimum holding period creates some complexity that is frequently misunderstood.

If you dispose of shares after 3 years:

• Your income tax relief is retained in full.
• The allowable loss is calculated as described above (investment minus proceeds minus retained relief).
• You can offset against income tax or CGT.

If you dispose of shares before 3 years:

• Your income tax relief is clawed back (in full for a disposal within the first year; proportionally in some circumstances).
• Because the relief is clawed back, it is no longer “received and retained,” so it is not deducted from the loss calculation.
• However, a disposal within 3 years means the shares lose their EIS status, so the loss is treated as an ordinary capital loss — it can only be offset against capital gains, not income tax.

This is an important distinction. Early disposal costs you the ability to offset against income tax, which is usually the more valuable option.

Loss Relief for Partial Disposals

You do not need to dispose of your entire holding to claim loss relief. If you sell part of your EIS shares at a loss, you can claim loss relief on the portion disposed of.

The allowable loss is calculated on a pro-rata basis. If you sell half your shares, you deduct half the income tax relief received from the loss calculation.

Example: You invested £40,000, received £12,000 income tax relief, and sell half your shares (representing £20,000 of the original investment) for £5,000. The allowable loss on the partial disposal is £20,000 - £5,000 - £6,000 = £9,000.

Common Mistakes

1. Missing the Negligible Value Claim

Many investors wait for formal liquidation before claiming loss relief. This can mean waiting years while the administrator winds up the company. A negligible value claim lets you crystallise the loss immediately, as soon as the shares have become effectively worthless.

2. Failing to Offset Against Income Tax

Some investors (and their accountants) default to treating EIS losses as capital losses. This is a costly error if you are a higher-rate or additional-rate taxpayer. Always consider income tax offset first.

3. Not Claiming Carry-Back

When offsetting against income tax, you can choose to set the loss against the previous tax year’s income. If your income was higher in the prior year (or you were in a higher tax band), carrying back the loss recovers more tax.

4. Losing Relief Through Early Disposal

Selling EIS shares before the 3-year holding period to “cut losses” often results in a worse outcome than holding to failure. You lose income tax offset (the loss becomes CGT-only), and your original income tax relief is clawed back. Unless the proceeds from early sale are substantial, holding on is usually the better tax outcome.

5. Forgetting to Claim Within the Time Limit

The 4-year window is a hard deadline. HMRC does not accept late claims for loss relief. If you have unrealised losses on EIS shares, act promptly — especially if the company entered administration several years ago.

How Loss Relief Reduces Portfolio Risk

For portfolio investors who spread capital across multiple EIS-qualifying companies, loss relief fundamentally changes the risk profile. Consider an investor who backs ten companies at £50,000 each (£500,000 total):

• Income tax relief received: £150,000 (30% of £500,000)
• Three companies succeed (shares worth £200,000 each): £600,000 total, tax-free gains
• Seven companies fail: Allowable loss = 7 x (£50,000 - £15,000) = £245,000
• Loss relief at 45%: £110,250 recovered

Net position: £500,000 invested. £150,000 income tax relief + £600,000 exits + £110,250 loss relief = £860,250 received. Net gain of £360,250 — even with a 70% failure rate.

Without EIS relief, the same portfolio (£500,000 invested, £600,000 returned from winners) would yield just £100,000 gain before CGT. After CGT at 20%, the net gain would be £80,000.

EIS loss relief does not just soften individual failures. It makes diversified early-stage portfolios viable for private investors who would otherwise be priced out by the risk.

Getting Advance Assurance Right

Loss relief only applies to investments in companies that genuinely qualify under EIS rules. If HMRC later determines that the company did not qualify, all reliefs — including loss relief — can be denied or clawed back.

This is why advance assurance matters. Having HMRC confirm qualification before investment protects investors from the worst-case scenario: a company that fails and does not qualify, leaving the investor with no relief at all.