Developer Day Rate Calculator
Get market day rate ranges for UK developer contractors. Select your role, seniority, IR35 status, and region to see where you should be pitching — and what your take-home will look like.
Frequently asked questions
What day rate should I charge as a UK developer contractor?
Day rates vary significantly by role, seniority, and location. A mid-level full-stack developer in London typically charges £350–£500/day, while a senior or lead developer can command £500–£850/day. Specialists in DevOps, cloud, or data engineering often attract a 10–15% premium. Rates outside London are typically 15–30% lower. Use this calculator to get a specific range for your profile.
How does IR35 affect my take-home pay as a contractor?
If you are inside IR35, the client (or agency) must deduct income tax and National Insurance before paying you, treating you like an employee for tax purposes. This can reduce your effective take-home to 58–62% of your gross day rate. Outside IR35, you operate through your own Ltd company, typically taking a salary plus dividends, with an effective take-home of 65–70%. Many contractors negotiate a higher rate for inside-IR35 roles to compensate.
How do I negotiate a higher day rate as a developer?
Research the market rate for your specific role and location using benchmarks like this calculator and contractor job boards. Highlight niche skills, relevant sector experience (finance, healthcare, defence often pay premiums), and a track record of delivering on time. For renewals, request an uplift with evidence of the value you have delivered. Consider asking for a higher rate if the engagement is inside IR35.
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