About ContractorDayRate.co.uk

What This Site Is

ContractorDayRate.co.uk is a free resource for UK contractors who want to understand their take-home pay quickly, accurately, and without needing to ring their accountant every time they consider a new contract.

At the heart of the site is our IR35 take-home pay calculator — a free tool that lets you enter any day rate and instantly see your annual, monthly, weekly, and hourly net income under three scenarios: outside IR35 (limited company), inside IR35 (PAYE), and self-employed. Every calculation uses the current 2026/27 tax rates, including the correct income tax bands, National Insurance thresholds, Corporation Tax rate, dividend allowance, and employer NI figures.

Alongside the calculator, we publish in-depth articles and guides covering IR35 legislation changes, limited company vs umbrella comparisons, day rate benchmarks by sector, contractor financial planning, and the broader question of whether contracting makes financial sense compared to permanent employment. All content is reviewed against current HMRC guidance and updated when rates or rules change.

The site is entirely free to use. There is no registration, no paywall, and no subscription. We are funded by advertising, which keeps the tools and guides accessible to every contractor regardless of whether they are just starting out or have been contracting for years.

Who It Is For

ContractorDayRate.co.uk is built specifically for UK-based independent contractors working through limited companies or umbrella companies. Our primary users fall into the following groups:

• IT and technology contractors — software developers, cloud and DevOps engineers, data engineers, cybersecurity consultants, business analysts, project managers, and scrum masters. Technology remains the largest single group of UK contractors, and IR35 compliance is a constant concern across the sector.
• Finance and accounting contractors — management accountants, financial controllers, FP&A specialists, risk and compliance professionals, and interim finance directors. Finance contracting has grown significantly as organisations bring in specialist capacity for transformation programmes and regulatory change.
• Engineering contractors — civil, structural, mechanical, electrical, and defence/aerospace engineers who work on project-based assignments across infrastructure, construction, and industrial sectors.
• Management consultants and programme managers — independent strategy, operations, and change management consultants who sell their services on a day-rate basis rather than as part of a consulting firm.
• Healthcare and life sciences contractors — locum professionals, clinical informaticians, and specialist medical contractors navigating NHS and private sector off-payroll rules.
• Permanent employees considering contracting — professionals who want to understand what day rate they would need to match their current salary and benefits package before making the move.

If you work for yourself, bill by the day, and need to understand the tax implications of your work structure — this site is for you.

Why You Can Trust the Numbers

Contractor tax calculations are genuinely complex. The interaction between income tax, National Insurance, Corporation Tax, dividend taxation, and the employer NI rules for inside IR35 contracts involves multiple moving parts, all of which change between tax years. Getting them wrong — either in your favour or against — has real financial consequences.

We take accuracy seriously. Here is how we maintain it:

• Current 2026/27 rates throughout. Every calculator and article on this site reflects the rates in force for the 2026/27 tax year, including the frozen personal allowance (£12,570), the higher rate threshold (£50,270), the Corporation Tax small profits rate (19%), the dividend allowance (£500), and the employer NI rate (15% with a £5,000 threshold).
• Accountant reviewed. The underlying calculation logic in our IR35 calculator has been reviewed by a qualified UK accountant to ensure it correctly models the salary-and-dividend strategy used by limited company contractors, the employer NI deduction mechanism for inside IR35 engagements, and the Class 4 NI treatment for sole traders.
• Regularly updated. We update the site at each Budget and at the start of each new tax year. When HMRC announces changes that affect contractor take-home pay — whether that is a NI rate change, a threshold freeze extension, or a dividend allowance adjustment — we update both the calculator and all affected articles.
• No rounding games. We calculate to the nearest pound and explain the methodology, so you can cross-check the figures against your own accountant's calculations. The calculator is not designed to produce an optimistic number — it is designed to produce an accurate one.

Navigate the Site

Everything on the site is free and requires no registration. Here is where to find what you need:

• IR35 Take-Home Pay Calculator — enter your day rate and see your exact net income for 2026/27, with a full tax breakdown and comparison between outside IR35, inside IR35, and sole trader.
• Articles and Guides — practical, in-depth guides covering IR35 rules, limited company vs umbrella, day rate benchmarks, contractor financial planning, and more.
• Contact — if you spot an error, have a question about the calculator, or want to suggest a topic for a new guide.