TaxSmith - UK Tax Calculator

TaxSmith is a free, simple UK tax calculator built for self-employed sole traders, freelancers and tradespeople.

Enter your annual income and business expenses, and TaxSmith instantly calculates:

• Income Tax (basic, higher and additional rates)
• Class 2 National Insurance
• Class 4 National Insurance
• Total tax bill
• Take-home pay (yearly, monthly and weekly)
• Your effective tax rate

Supports both the 2025/26 and 2026/27 UK tax years with up-to-date HMRC rates and thresholds including the personal allowance, basic rate band and NI limits.

KEY FEATURES

• Instant calculations with no internet required
• Works completely offline
• Supports 2025/26 and 2026/27 tax years
• Personal allowance tapering for high earners (over 100k)
• Class 2 and Class 4 NI calculated automatically
• Clean, dark-themed professional interface
• No ads, no tracking, no subscription

PERFECT FOR

• Sole traders calculating quarterly payments
• Freelancers estimating take-home pay
• Tradespeople (builders, plumbers, electricians)
• Self-employed workers preparing for Self Assessment
• Anyone considering going self-employed

TaxSmith provides estimates based on current UK tax rates for self-employed individuals. It does not constitute financial advice. Consult a qualified accountant for your specific situation.