Anchored to UK statute. Last verified 21 June 2026. View source-of-record.

maduediligencechecklist.co.uk

The UK M&A Due Diligence Checklist

Schedule

III

Tax


Corporation tax, VAT, PAYE/NIC, SDLT, ERS, R&D claims. Drives the tax-deed scope.


  • III.1
    Obtain corporation-tax computations and CT600 returns for the last six years.[CTA 2009]
    Severity A
  • III.2
    Identify any open HMRC enquiries, discovery assessments or pending litigation.
    Severity A
  • III.3
    Confirm tax-losses carried forward and any restriction on use (CIR, group, change-of-ownership).
    Severity B
  • III.4
    Review group-relief surrenders / claims for the last six years.
    Severity B
  • III.5
    Review R&D tax-credit claims: methodology, supporting file, advance assurance.[HMRC R&D]
    Severity A
  • III.6
    Confirm any Patent Box election and supporting computation.
    Severity C
  • III.7
    Obtain VAT returns for the last four years; reconcile to ledger.
    Severity B
  • III.8
    Confirm partial-exemption methodology, capital-goods scheme and option-to-tax positions.
    Severity B
  • III.9
    Confirm PAYE/NIC compliance: P11D, IR35 status determination statements, RTI filings.
    Severity B
  • III.10
    Review off-payroll engagements and SDS evidence for each consultant.
    Severity B
  • III.11
    Confirm any HMRC PAYE or VAT inspection in the last six years and outcome.
    Severity B
  • III.12
    Obtain SDLT returns and confirm filing for each historic property acquisition.
    Severity C
  • III.13
    Review employment-related securities (ERS) returns, EMI option grants and 90-day notifications.
    Severity A
  • III.14
    Confirm EMI option grants meet qualifying-trade and individual-limit conditions.
    Severity A
  • III.15
    Identify any disguised-remuneration or loan-charge exposures.
    Severity A
  • III.16
    Review transfer-pricing documentation and master/local file requirements.
    Severity B
  • III.17
    Confirm any tax clearances obtained (s.701, s.138 TCGA, advance pricing agreement).[TCGA 1992]
    Severity B
  • III.18
    Identify any tax exposures in dormant or recently-struck-off group entities.
    Severity C
  • III.19
    Confirm CIS compliance for any construction-sector activity.
    Severity B
  • III.20
    Confirm gross-payment status under CIS where relevant.
    Severity C
  • III.21
    Obtain tax-deed draft and reconcile scope to identified exposures.
    Severity A
  • III.22
    Confirm any exit-charge or de-grouping considerations under the proposed deal structure.
    Severity ABuy-side

Reviewed by Oliver Wakefield-Smith, Founder, Digital SignetLast verified 21 June 2026Schedule III

This page is anchored to UK primary legislation and named regulator guidance only. Not legal advice. Confirm position with your appointed adviser before signing.