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HMRC internal manual

Debt Management and Banking Manual

HM Revenue & Customs
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Interest: Interest Review Unit (IRU): Income Tax Self Assessment (ITSA): assessments

The normal interest due date for an assessment is the balancing payment due date for the year of assessment. But some assessments have different, later, due dates.

If an assessment is issued with an incorrect interest due date, there may be a legal impact about whether the interest charge is valid. This could make it difficult to take formal recovery action, if the case gets to that point. The proper action is to have the incorrect assessment removed and an assessment bearing the correct due date sent out. Where this is not possible the interest charge should be recalculated from the correct date and any excess interest given up.

Guidance on the relevant dates for HMRC assessments can be found inSAM20070.