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HMRC internal manual

Self Assessment: the legal framework

Enquiries into Tax Returns: time limits for discovery assessments

Section 34(1)

In any case of incomplete disclosure without careless or deliberate conduct the time limit for a discovery assessment is not later than 4 years after the end of the tax year to which it relates.

Section 36(1) and (1A)

In any case involving a loss of tax brought about carelessly, the time limit for making a discovery assessment is not later than 6 years after the end of tax year to which the assessment relates.

The time limit for making a discovery assessment is not later than 20 years after the end of the tax year to which it relates where the loss of tax is:

  • brought about deliberately by the person
  • attributable to a failure to notify liability under Section 7, or
  • attributable to a tax avoidance scheme which is a notifiable arrangement or a listed or hallmarked scheme and the user of the scheme failed to disclose details to HMRC at the proper time.

Payment of tax

Section 59B(6)

The due date for tax charged by a discovery assessment is 30 days after the notice of the assessment is given (delivered).