You must check the date from which these rules apply for the tax or duty you are dealing with. See CH81011 for full details.

The amount of the penalty is based on the Potential Lost Revenue (PLR), see CH82160. You should work out the amount of the penalty by applying an appropriate percentage to the PLR depending on whether the inaccuracy was

careless, see CH81130

deliberate but not concealed, see CH81150, or

deliberate and concealed, see CH81160.

Where there has been an under-assessment and the person did not take reasonable steps to tell us about it within 30 days, see CH81170.

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