SEIS Calculator

Tax Year 2026/27

Annual Cap £200,000

Income Tax Relief 50% Flat

Investment Details

SEIS investment amount £25,000

Your Marginal Rate

Do you have a capital gains tax liability?

Primary tax reliefs

Income Tax Relief (50%) £12,500

CGT Rebate £0

£12,500

Effective Net Outlay £12,500

50.0% Effective Cost

Total Position Value

£87,500

Growth + Tax Rebates

Includes 3x tax-free exit growth plus upfront income and CGT exemptions.

Full company failure

Maximum capital at risk

£6,875

Loss Relief @ 45%

Your net remaining loss is offset against income tax at your highest bracket.

Hold Period Required: 3 Years

Illustrative only. Forecast for 2026/27 Tax Year. SEIS involves high risk. Capital is at risk. Seek formal tax advice.