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An SA370 is a form used by individuals who have filed a Self Assessment late and want to appeal against the payment penalties. A Reasonable Excuse is needed.

More detail:

An SA370 is a form issued by HMRC in the United Kingdom for individuals who have filed their Self Assessment late and want to appeal against the late penalties issued by HMRC.

An SA370 should only be submitted by individuals who believe they have a Reasonable Excuse for filing their tax return late.

The SA370 must be submitted within 30 days of receiving the late penalty notice.

The form can be submitted online if you are only appealing against a £100 late filing penalty for tax returns from 6th April 2019 onwards. Otherwise, you must file the form via the post.

An example page of the SA370 is shown below:

A photo of page 2 of a blank SA370 form

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