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Seis Tax Relief Calculator UK

Enter your values below to get the result first, then scroll for the full explanation and guidance.

Step 1 • Add values

Use the calculator

Enter your values below to generate an instant result. You can update the inputs at any time to compare different scenarios.

Confirm eligibility and enter your 2026/27 subscriptions and available Income Tax.

Results refresh instantly as values change.

Potential relief not calculated

Confirm eligibilityEIS/SEIS certificate and investor conditions required

Potential relief not calculated: Confirm eligibility (EIS/SEIS certificate and investor conditions required)

Confirm you hold the relevant compliance certificate and meet the investor and share conditions before using a numerical estimate.

What to watch

Confirm you hold the relevant compliance certificate and meet the investor and share conditions before using a numerical estimate.

Result snapshot

A quick visual read of the values behind this result.

This calculator updates instantly as your values change, so you can compare outcomes without extra steps.

This calculator cannot determine company or investor eligibility.

Try different values to compare results.

Estimate SEIS Income Tax relief at 50% of qualifying subscriptions, subject to the annual investor limit and your available UK Income Tax.

Fast to use

Built for comparison

Clear result output

Table of Contents

6

About Seis Tax Relief Calculator UK

Seis Tax Relief Calculator UK helps you work through the main numbers for this topic quickly with a simple input flow and an instant result.

Use the calculator result as a practical starting point, then review the explanation and assumptions on the page if you want more context.

SEIS Income Tax relief

The 2026/27 annual investor limit is GBP 200,000. Relief cannot exceed available UK Income Tax and is not automatically claimable from the investment amount alone.

Formula explained

Calculation flow

This calculator is structured for fast UK-focused estimates with clear inputs, repeatable logic, and instant results.

Formula

Input values -> calculation engine -> instant result

How the result is built

1Enter the values requested in the form.
2The calculator applies the configured formula logic.
3The result updates instantly with a breakdown.
4Use the output to compare scenarios quickly.

Example

Confirm eligibility and enter your 2026/27 subscriptions and available Income Tax.

Assumptions

  • For qualifying SEIS shares issued and claimed in 2026/27 with a valid SEIS3 and user-confirmed eligibility. Excludes carry-back, CGT reinvestment and final tax-return outcome.

Source basis

  • UK-focused calculator flow
  • Structured input validation
  • Instant result breakdowns

FAQ

Common questions

No. Capital Gains Tax reinvestment relief is a separate calculation.

Trust and notes

Assumptions and important notes

This calculator is designed to give a fast estimate using the method shown on the page. Results are most useful when your inputs are accurate and the tool matches your situation.

Use the result as guidance rather than a final diagnosis or professional decision. If the result could affect health, legal, financial, or compliance decisions, verify it with a qualified source where appropriate.

  • For qualifying SEIS shares issued and claimed in 2026/27 with a valid SEIS3 and user-confirmed eligibility. Excludes carry-back, CGT reinvestment and final tax-return outcome.

Method

UK calculator guidance

Last reviewed

April 17, 2026