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HMRC internal manual

Company Taxation Manual

CTSA: quarterly instalments: due dates: 12 month accounting period

The number of quarterly instalment payments a company needs to make depends on the length of the accounting period.  However, in all cases the final instalment is due three months and 14 days after the end of the accounting period (REG5).

For a twelve-month accounting period the due dates for quarterly instalments are:

  • first instalment, six months and 13 days after the start of the accounting period,
  • second instalment, three months after the first,
  • third instalment, three months after the second,
  • final instalment, three months and 14 days after the end of the accounting period.

The due dates for the second and third instalments run from the due date for the first and second instalments respectively, not from the start of the accounting period.

  • When the first or second instalment is due on the last day of a calendar month:
    • the second or third instalment, as the case may be, is due on the last day of the third following month.
  • When the first or second instalment is due on some other day:
    • the second or third instalment, as the case may be, is due on the correspondingly numbered day in the third following month.
  • When there is no correspondingly numbered day in the third following month:
    • the second or third instalment is due on the last day of the third following month.

There are examples at CTM92570.