BIM42523 | Specific deductions: administration: National Insurance contributions

From HM Revenue & Customs · Business Income Manual

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No deduction is allowed in computing the taxable profits of a trade for any National Insurance contributions paid by any person other than secondary Class 1 contributions, Class 1A contributions and Class 1B contributions.

Where primary Class 1 contributions are deducted from employees’ salaries, the above rule does not deny a deduction for the gross salaries (that is, before deduction of the contributions).

For guidance on National Insurance contributions generally see the .