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More than 11.5 million people did complete the self-assessment process, including more than 31,000 who finished it during the final hour before the deadline.

For those who missed the self-assessment deadline, the financial penalties include:

Appeals against a fine can be made either by filing in a form or by writing a letter to HMRC, but a self-assessment must have been completed before making an appeal.

Friday, which was pay day for many people in the UK, was the deadline for self-assessment tax returns.

The outage is occurring on what is pay day for many people in the UK, and the deadline for self-assessment tax returns.