Our IR35 comparative calculator shows the financial implications of IR35 tax legislation in relation to working inside or outside IR35. Simply enter your information to compare the effects of working inside IR35, via our Temporary Worker Service (TWS) or an external payroll provider, with working outside IR35 via a Professional Services Company (PSC).

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Assignment via Temporary Worker Service ('Inside IR35 Assignment')

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What the calculator does

This displays a full set of calculations when working via our TWS solution or an external provider on an inside IR35 assignment.

The stages are:

  • The worker enters the assignment rate per day they wish to charge.
  • The working days per year field is pre-filled with 230 (260 working days minus 8 bank holiday days and 22 days holiday).
  • This provides the total assignment rate/gross pay rate.
  • It computes the employer’s NI due to be paid by the provider on the assignment rate/gross pay rate.
  • It prefills an assumed external provider fee.
  • It rolls up the contract value (this would be the total cost to us or charge to external provider).
  • It provides the contract value per day (which is our cost to which we add a margin to charge the end client).
  • It then calculates employee NI due and employee PAYE income tax due.
  • It returns the worker’s net total salary.
  • The effective daily net and net retention % are provided.

Disclaimer

The calculator is based on a 12-month contract with relevant holiday days taken into consideration and assumes a tax code of 1250L and is for illustrative purposes only. All data for NI and taxation has been calculated for the current tax year using data and information directly from the HMRC website. We assume opt out from pension auto-enrolment. Tax calculations dependent on specific circumstances, therefore individual advice should be sought.