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Measured on six things

Free UK Corp Tax calculator with marginal relief, scenari...

Security

HTTPS enforced with SPF/DMARC, but no HSTS, CSP, or frame protection. No security certifications or privacy policy visible. Standard for a small free tool, but behind what a tax calculator handling financial data should offer.

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UK Corporation Tax Calculator 2026/27

About this app

I’ve been on the hunt for a reliable, free way to estimate UK corporation tax, and this calculator from UK Creative Ventures is a real find. It’s not just a simple tax tool; it’s a comprehensive planning companion for any limited company director. The standout feature is its handling of marginal relief – the calculator automatically applies the correct rate (19% to 25%) based on your taxable profit, and it even accounts for associated companies, which is something many basic calculators overlook. The scenario planner is brilliant for exploring different profit levels and seeing how tax changes, which is perfect for making smart decisions about dividends or investments. Plus, it includes payment and filing deadlines, so you can stay on top of HMRC obligations. The whole thing is free, requires no sign-up, and is updated for the 2026/27 tax year – I can’t ask for more.

Key features

1Automatic marginal relief calculation (19%-25% band) with associated companies support
2Scenario planner comparing three profit levels for salary vs dividend planning
3Payment and filing deadline calculator based on accounting period end date

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Directors and owners of small UK limited companies (profit < £50k)

Pain points

Unsure how much tax they owe, especially with marginal relief; need quick estimates without professional fees

Primary needs

Accurate tax calculation, easy to use, free

Demographic

Directors of growing companies with profits in the £50k-£250k band

Pain points

The 26.5% marginal rate is a trap; need to compare scenarios like salary vs dividends, plan investment timing

Primary needs

Scenario planning, understanding effective rates, decision-making support

Demographic

Accountants and financial advisors in the UK

Pain points

Need to quickly model tax for clients, especially with associated companies

Primary needs

Advanced features (associated companies, deadline calculator), accurate calculations, time-saving

Demographic

Startups and entrepreneurs considering company structure

Pain points

Trying to decide between sole trader and limited company; need to estimate tax liabilities

Primary needs

Simple tax estimation, educational information, free tool

Scout Review

Written by AI from measured evidence, scored out of 100.

UK Corporation Tax Calculator 2026/27 is a genuinely useful free tool that fills a real gap. Its handling of marginal relief, associated companies, and scenario planning exceeds what AccountingWEB, Crunch, and TaxScouts offer. The usability is strong — no sign-up, instant results, clear tabs. But it's held back by plain design, weak security headers, and accessibility gaps. For a free tool, it's excellent value; for a serious financial resource, it needs polish. The core calculation logic appears sound, and the educational content on marginal relief is well-written. If you're a small UK company director in the £50k-£250k profit band, this is worth bookmarking.

Measure by measure

Usability

Genuinely easy to use. Three tabs make scope obvious, results update instantly, scenario planner is a real differentiator. No sign-up friction. Clear labels and immediate feedback. Solid for the target audience.

Design

Functional but plain. Clear state feedback on tabs and segmented buttons, yellow marginal relief callout is effective. Generic form styling and heavy navy hero drag it down; branding feels mismatched for a tax tool.

Speed

Fast enough. Mobile 81/100 with LCP 3.2s and zero layout shift; desktop 70/100. Lightweight static page, no heavy JS. Slightly slow LCP on mobile but acceptable for a simple calculator.

Security

Accessibility

Lighthouse 87/100 but with real issues: prohibited ARIA attributes, contrast failures, missing form labels, no main landmark. No WCAG statement or multi-language support. Keyboard nav seems okay but unverified. Needs work for full compliance.

Growth

Real problem, underserved segment, clear differentiators. Marginal relief trap is painful and recurring; free no-signup tool with associated companies support beats all three alternatives on depth.

Improvement areas

Add security headers (HSTS, CSP) and a privacy policy for financial data handling
Fix accessibility issues: form labels, main landmark, color contrast on callout
Improve visual design: custom form styling, lighter hero, better brand alignment

Design & Usability

The calculator is straightforward: three tabs (Tax calculator, Scenario planner, Payment dates) make the scope instantly clear. Results update live below the form, and the yellow marginal relief callout effectively explains the 19-25% band. The scenario planner is a genuine differentiator — comparing three profit levels side-by-side for salary vs dividend planning is something the alternatives don't offer. However, the design is plain: generic browser form fields, a heavy navy hero that feels empty, and branding that clashes with the serious tax context. Usability is strong where it matters — no sign-up, clear labels, immediate feedback — but the visual polish lags behind.

Speed & Security

Performance is respectable: mobile Lighthouse 81/100 with zero layout shift and 165ms TBT, though LCP at 3.2s could be snappier. Desktop scores 70. The page is lightweight with minimal JavaScript, so it feels responsive in practice. Security is the weak spot: HTTPS is enforced and SPF/DMARC are present, but HSTS, CSP, and frame protection are all missing. There's no visible privacy policy or security certifications — concerning for a tool handling financial data, though typical for a free small-business resource. The security header checklist scores 4/12, which is below what I'd want for a tax calculator.

Accessibility & Growth

Accessibility is a mixed bag: Lighthouse scores 87/100, but the audit flags real issues — prohibited ARIA attributes, insufficient color contrast (especially the yellow callout), form elements without labels, and a missing main landmark. No WCAG statement or multi-language support is offered. Growth potential is strong: the marginal relief trap (26.5% effective marginal rate) is a genuine pain point for small UK companies, and this tool addresses it with associated companies handling, scenario planning, and payment deadlines — features none of the three alternatives offer. The free, no-signup model lowers adoption barriers, and HMRC rate changes create recurring demand. The wedge is real, though the brand needs to establish trust to compete with established names like Crunch.

Conclusion

This is a solid free tool that understands its audience. The scenario planner and associated companies support are genuinely useful features that the bigger names overlook. It's not going to win design awards, and the security posture needs attention, but for the price (free) and the problem it solves, it's hard to beat. I'd recommend it to any small UK company director — just don't enter sensitive data without checking the privacy policy first. If the team invests in accessibility, security headers, and a cleaner visual design, this could become the go-to resource for UK corporation tax estimation.

Suggestions for improvement

Add a privacy policy and data handling statement — users are entering financial data
Fix accessibility issues: form labels, main landmark, contrast on yellow callout
Add HSTS, CSP, and frame protection headers to improve security posture
Consider a cleaner hero section with less empty navy space and more visual hierarchy

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	UK Corporation Tax Calculator 2026/27	UK Corporation Tax Calculator by AccountingWEB	Corporation Tax Calculator by Crunch	TaxScouts Corporation Tax Calculator
Marginal relief calculation	Full 19%-25% taper with associated companies threshold splitting	Basic estimate, no marginal relief detail	Includes marginal relief but no associated companies	Simple calculation, limited marginal relief handling
Scenario planning	Side-by-side comparison of three profit scenarios (A/B/C)	Not available	Not available	Not available
Payment deadline calculator	Calculates deadline from accounting period end date	Not available	Not available	Not available
Associated companies support	Full support with threshold splitting explanation	Not mentioned	Not mentioned	Not mentioned
Sign-up required	No sign-up required	No sign-up required	No sign-up required	No sign-up required