SEIS & EIS Startup Investor Tax Relief Calculator

Calculate your Income Tax relief (50% SEIS / 30% EIS) and evaluate net effective investment costs for UK startup investments.

Patent Box Tax Relief →HMRC Tax Hub →

Venture Capital Tax Relief Estimator

Compute Income Tax reduction and net capital risk for SEIS and EIS investments

Venture Capital Scheme

Investment Amount (£)

Max cap: £200k (SEIS) / £1m (EIS)

Venture Tax Relief Result:

Tax Relief Rate

50%

HMRC Tax Credit

Income Tax Relief

£25000

Tax Reduction

Net Effective Cost

£25000

Actual Risk

SEIS vs EIS Comparison Breakdown

Both schemes encourage equity investment in early-stage UK trading companies.

Feature	SEIS (Seed Stage)	EIS (Growth Stage)
Income Tax Relief Rate	50% Relief	30% Relief
Max Annual Individual Limit	£200,000 / tax year	£1,000,000 / tax year (£2m for KIFs)
Capital Gains Tax Exemption	100% Tax-Free after 3 years	100% Tax-Free after 3 years
CGT Reinvestment Relief	50% CGT exemption on asset sales	100% CGT deferral relief

Investor Loss Protection & Holding Rules

3-Year Holding Period

Shares must be held for 3 full years from issuance to permanently keep Income Tax relief and CGT exemption.

Loss Relief Protection

If the startup fails, net loss can be offset against Income Tax at 40% or 45%, capping maximum loss at 27.5p per £1 invested (SEIS).

Frequently Asked Questions (FAQs)

SEIS offers 50% Income Tax relief on investments up to £200,000 per tax year in early-stage startups, while EIS offers 30% Income Tax relief on investments up to £1,000,000 per tax year.

Yes. Any capital gains realized when selling qualifying SEIS or EIS shares held for at least 3 years are 100% exempt from Capital Gains Tax.

If a startup fails, investors can claim Loss Relief against their Income Tax at their marginal tax rate (40% or 45%), significantly limiting net downside risk.

Shares must be held for a minimum of 3 years from the date of issue to retain Income Tax relief and CGT exemption.

The startup issues an official SEIS3 or EIS3 certificate. You claim relief through your HMRC Self-Assessment tax return or by adjusting your PAYE tax code.