The general charging provisions are in ICTA88/S18 and ICTA88/S60
(Income Tax) and ICTA88/S70 (Corporation Tax).
ICTA88/S18 (1) supplies the basic Schedule D charge. That
part which is relevant to Cases I and II provides that:
Tax under this Schedule shall be charged in respect of the
annual profits or gains arising or accruing:
ICTA88/S18 (2) directs that tax under Schedule D shall be charged under the six Cases provided in ICTA88/S18 (3) which include:
ICTA88/S60 directs that subject to the provisions of this
Section and Sections 61 to 63 Income Tax under Cases I and II shall
be charged on the full amount of the profits of the year of
assessment. The equivalent provision for Corporation Tax is
ICTA88/S70.
The important words in Section 18 are `
the annual profits or gains arising or accruing'.
These words, with the reference in Section 60 to `
the full amount of the profits', have been
interpreted by the Courts as requiring the consideration of
`profits' as that word would be understood in its ordinary sense in
commercial life. This involves setting against the receipts of a
trade etc in any given period the expenses incurred to earn those
receipts. More specifically, those profits are to be those
calculated in accordance with the correct principles of commercial
accountancy. That result is not, however, conclusive of the quantum
of the profits for tax purposes; the Taxes Acts may still require
specific adjustments.
Until FA98/S42 the Taxes Acts did not provide any
comprehensive guidance on the way in which these profits should be
calculated and the methodology has emerged and refined over the
years through court decisions. With effect for periods of account
beginning after 6 April 1999 FA98/S42 requires that for the
purposes of Case I or II of Schedule D the profits of a trade,
profession or vocation are to be computed on an accounting basis
which gives a true and fair view, subject to any adjustment
required or authorised by law. The true and fair view concept is
imported from the Companies Act 1985 Sections 226 - 227 and
Schedule 4-4A. The concept is therefore a legal one. One adjustment
required by law is that tax is charged on the full amount of the
profits so a tax adjustment would be made if the accounting method
did not compute this figure.