Mainpay Ltd v The Commissioners for HMRC

Mainpay Ltd v The Commissioners for HMRC

The Court held that discontinuous periods of work under a single contract do not constitute a single employment for tax purposes where there is no overarching contract of employment; each assignment is a separate employment. The Court further held that Mainpay's failure to take reasonable care in ensuring the contract was an overarching contract of employment directly caused the loss of tax, and HMRC's pleadings were adequate. The appeal was dismissed on all grounds.

Parties
Appellant: Mainpay Ltd; Respondents: The Commissioners for HM Revenue and Customs
Jurisdiction
England and Wales
Judgment Date
10 October 2025
Procedural Posture
Civil Appeal (tax) / Court of Appeal Judgment on Appeal From Upper Tribunal (tax and Chancery Chamber)
Outcome
Appeal dismissed
Legal Topics
PAYE, National Insurance Contributions, Overarching Contract of Employment, Temporary and Permanent Workplace, Deductibility of Expenses, Carelessness in Tax Returns, Statutory Interpretation
Tax Law Employment Law PAYE National Insurance Contributions Overarching Contract of Employment Temporary and Permanent Workplace Deductibility of Expenses Carelessness in Tax Returns +1 more

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Parties

Mainpay Ltd

Appellant

The Commissioners for HM Revenue and Customs

Respondents

Procedural Posture

Civil Appeal (tax) / Court of Appeal Judgment on Appeal From Upper Tribunal (tax and Chancery Chamber)

Legal Issues

  1. 1 Whether discontinuous periods of work under a single contract constitute a single employment for tax purposes
  2. 2 Whether benchmark or estimated expenses can be deducted without a dispensation
  3. 3 Whether Mainpay's carelessness caused the loss of tax and if HMRC's pleadings were adequate

Ratio Decidendi

The Court held that discontinuous periods of work under a single contract do not constitute a single employment for tax purposes where there is no overarching contract of employment; each assignment is a separate employment. The Court further held that Mainpay's failure to take reasonable care in ensuring the contract was an overarching contract of employment directly caused the loss of tax, and HMRC's pleadings were adequate. The appeal was dismissed on all grounds.

Court Disposition

Appeal dismissed

Orders

  • Appeal dismissed on all grounds
  • No change to the decisions of the Upper Tribunal and First-tier Tribunal