
Chapter 22: Self assessment and PAYE
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Accounting period less than 12 months
When a company has an accounting period of less than 12 months, the amount of
the instalments is calculated as follows:
Estimated corporation tax liability ×
periodaccountingtheinmonthsofNumber
months3
The first instalment is payable six-and-a-half months after the start of the
accounting period.
The last payment can never be later than three-and-a-half months after the end
of the accounting period.
The company will pay as many three-monthly instalments as possible in
between the earliest and latest payment dates, and will pay on the 14
th
day of the
appropriate month.
Therefore if a company prepares nine-month accounts to 30 September 2009 (i.e. 1
January 2009 to 30 September 2009). Tax payments are due as follows:
First instalment: 14 July 2009. This is six-and-a-half months after the start of the
accounting period.
Second instalment: 14 October 2009. This is three months later.
Third instalment: 14 January 2010. This is three months later, and it is the last
instalment.
4.2 Payment dates for income tax, Class 4 NICs and capital gains tax
Capital gains tax is collected under self assessment and is due in one single payment
by 31 January following the end of the tax year (i.e. for 2009/10, by 31 January 2011).
Income tax that is not collected under PAYE or at source and Class 4 NICs (if
applicable) are usually paid in three instalments, as follows:
Due date For 2009/10
Two equal payments on account:
1st payment on account 31 January in the tax year 31 January 2010
2
nd
payment on account 31 July following the end of the tax year 31 July 2010
Balancing payment 31 January following the end of the tax year 31 January 2011
The amount of each payment on account
The amount of each payment on account (POA) is calculated as follows:
POA = ½ × Tax paid by self assessment in the preceding tax year
The tax paid by self assessment for the preceding year is calculated as follows:
£
Income tax liability X
Plus Class 4 NICs
X
Total tax liability X
Minus: tax deducted at source
(X)
Minus: PAYE
(X)
X