To correct a P11D form, you must file a corrected return on paper. This involves preparing a new version of the P11D(b) form with all the benefits and expenses for the tax year, not just those needing correction, as well as new versions for any individual P11D forms that are incorrect.

Corrections cannot be filed through software, and must instead be processed directly on the HMRC portal or through paper submissions.

When submitting a corrected form, indicate that it is a correction to the previous submission.