Resources

NI Contributions Calculator 2025/26 — National Insurance UK | Aitaxo

Free UK National Insurance calculator for employees, employers, and self-employed. Class 1 and Class 4 NI rates for 2025/26.

National Insurance contributions checker

Calculate Class 1 employee/employer NI and Class 4 self-employed NI obligations for 2025/26.

  • ✓ Class 1 Employee and Employer rates
  • ✓ Class 4 and Class 2 Self-Employed metrics
  • ✓ Secondary and Primary thresholds mapping