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HMRC internal manual

Debt Management and Banking Manual

HM Revenue & Customs
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Interest: Interest on reallocations and repayments - by IT system: SAFE: Inhibition of automatic calculation of repayment interest

The setting of the Interest Exception or Inhibit Interest signal prevents the automatic calculation and application of repayment interest (RPI credit) in SAFE.

DMBM403050 explains how to create a manual RPI credit.