Know Your Tax
Free, transparent tax tools for UK contractors. No sign-ups, no ads, no data collection. Just accurate calculations using the latest HMRC rates and thresholds.
IR35 Inside Take-Home Calculator
See exactly where every pound goes when you work inside IR35 via an umbrella company. The full deduction chain from your day rate to net pay — including Employer's NI, Apprenticeship Levy, pension, and student loans.
LTD Company Expenses Guide
Every allowable expense for a UK limited company in 2026/27. Searchable and filterable by category, with HMRC limits, rates, and what changed from last year. Built for contractors working outside IR35.
Who is this for?
Whether you're a contractor weighing up umbrella vs limited company, comparing inside vs outside IR35 take-home, or just trying to understand what your umbrella payslip actually means — these tools give you the numbers without the jargon. All calculations use 2026/27 HMRC rates and are updated when thresholds change.