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CTM94090 | CTSA: Penalties for late returns: Interaction of flat-rate & tax-related penalties

From HM Revenue & Customs · Company Taxation Manual

Tax-related penalties due under do not affect flat-rate penalties due under . You can charge a penalty under both paragraphs in relation to the same accounting period and company tax return.

A company usually incurs a flat-rate penalty before a tax-related penalty. However, it is possible for a company to incur a penalty under both paragraphs at the same time.

  • A company incurs a flat-rate penalty on the day following the filing date.

  • A company usually incurs a tax-related penalty on the day following the expiry of 18 months after the end of the return period.

However, as explained at , the filing date may be later than this 18-month point in which case the company also incurs the tax-related penalty on the day following the filing date.

You base the tax-related penalty on the tax unpaid at the date on which the company incurs the penalty (FA98/SCH18/PARA18 (3)). This will be 18 months and one day after the end of the accounting period or, if the filing date is later than that, the day after the filing date - see .