For partners
Add our free IR35 calculators to your site
Free, mobile-friendly and always kept current with UK contractor tax rules. If you advise or write for contractors, freelancers or the recruiters and clients who engage them, drop any of these into your own pages with a single line of HTML. We keep them up to date; you keep your readers on your site.
Built for recruitment agencies, contractor bodies, umbrella and accountancy comparison sites, and industry blogs. The only condition is that you leave the small “Powered by Contractor Tax Accountants” line in place.
How to embed (2 steps)
Step 1
Paste the calculator
Copy the iframe snippet for the calculator you want and paste it into your page where you want it to appear.
Step 2
Add the resize script once
Paste the small script below anywhere on the same page. It lets each calculator grow or shrink to fit its content, so there is no awkward scrollbar.
<!-- Add once, anywhere on the page. Lets the calculators resize to fit. -->
<script>
window.addEventListener("message", function (e) {
if (e.data && e.data.type === "ir35-embed-height") {
document
.querySelectorAll('iframe[src*="www.contractortaxaccountants.co.uk/embed/"]')
.forEach(function (f) { f.style.height = e.data.height + "px"; });
}
});
</script>The calculators
Outside IR35 Take-Home Pay Calculator
Preview the full page →Work out your annual net take-home through a limited company on an outside-IR35 contract for 2026/27, with the full salary, dividend, corporation tax and NIC breakdown.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/outside-ir35-take-home-calculator"
title="Outside IR35 Take-Home Pay Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Inside IR35 Take-Home Pay Calculator
Preview the full page →Work out your annual net take-home on an inside-IR35 or umbrella contract for 2026/27, after employer NIC, the Apprenticeship Levy, the umbrella margin and PAYE.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/inside-ir35-take-home-calculator"
title="Inside IR35 Take-Home Pay Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Umbrella vs Limited Company Calculator
Preview the full page →Compare your annual take-home through an umbrella (inside IR35) against a limited company (outside IR35) at the same day rate for 2026/27, and see the difference in pounds.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/umbrella-vs-limited-calculator"
title="Umbrella vs Limited Company Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Dividend Tax Calculator
Preview the full page →Work out the dividend tax due on your salary and dividends for 2026/27, with the £500 allowance and the tax in each band shown at the 10.75%, 35.75% and 39.35% rates.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/dividend-tax-calculator"
title="Dividend Tax Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Corporation Tax Calculator
Preview the full page →Work out your company's corporation tax for the 2026/27 financial year, including marginal relief between £50,000 and £250,000 and the effect of associated companies.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/corporation-tax-calculator"
title="Corporation Tax Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Contractor Salary and Dividend Calculator
Preview the full page →Compare a £12,570 versus £6,708 director salary on the same turnover for 2026/27 and see which leaves a single-director company with the higher net take-home.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/contractor-salary-dividend-calculator"
title="Contractor Salary and Dividend Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="660"
loading="lazy"
></iframe>Umbrella Company Take-Home Pay Calculator
Preview the full page →Calculate your real net pay through an umbrella company for 2026/27 from a day rate, including employer NIC, Apprenticeship Levy, umbrella margin and pension.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/umbrella-take-home-calculator"
title="Umbrella Company Take-Home Pay Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="720"
loading="lazy"
></iframe>Contractor Day Rate Calculator
Preview the full page →Turn your day rate into annual net take-home across every contracting route for 2026/27, and see exactly what inside day rate would match your outside net.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/contractor-day-rate-calculator"
title="Contractor Day Rate Calculator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="720"
loading="lazy"
></iframe>Managed Service Company Risk Checker
Preview the full page →Screen your accountant or provider arrangement against the statutory involvement tests that make a company a Managed Service Company under Chapter 9 ITEPA 2003.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/managed-service-company-risk-checker"
title="Managed Service Company Risk Checker by Contractor Tax Accountants"
style="width:100%;border:0;"
height="820"
loading="lazy"
></iframe>IR35 Status Indicator
Preview the full page →A weighted, plain-English indicator of whether your contract working practices point inside or outside IR35, based on substitution, control, mutuality of obligation and SDC.
<iframe
src="https://www.contractortaxaccountants.co.uk/embed/ir35-status-indicator"
title="IR35 Status Indicator by Contractor Tax Accountants"
style="width:100%;border:0;"
height="780"
loading="lazy"
></iframe>Partnerships
Want a calculator built for your audience?
If you run a contractor, recruitment or freelancing site and want a co-branded tool or a calculator tailored to your readers, we are happy to help. Get in touch and tell us what you need.