
Chapter 6: Capital allowances – plant and machinery
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If there is an expensive car with private use, the WDA is calculated in the following
order:
restrict to £3,000 if necessary first, then
time-apportion the WDA for the length of the accounting period and deduct
from the expensive car column, then
enter the business proportion of the allowance in the total allowances column in
the proforma.
8.3 Long periods of account
If an individual sole trader or a partnership changes its accounting date and
produces a set of accounts in excess of 12 months, the treatment for capital
allowances depends on whether or not the accounts exceed 18 months in length.
Long period of account not exceeding 18 months
If the accounts are more than 12 months in length, but not in excess of 18 months:
One adjustment of profit computation is produced for the long period of
account.
Only one capital allowance computation is produced and the WDA is scaled up
according to the length of the accounting period. For example if a 17-month set
of accounts is produced, the WDA for plant and machinery is 20% × 17/12. This
is different from the rule for companies (see later chapter).
Note that only the AIA and WDA are scaled up. FYAs and balancing adjustments
are not subject to time-apportionment.
If there is an expensive car with private use in a long period of account, the WDA is
calculated in the same order as mentioned above for short periods of account,
except that the WDA is scaled up, not time-apportioned downwards.
Long period of account in excess of 18 months
If the accounts are in excess of 18 months in length:
One adjustment of profit computation is produced for the long period of
account.
However, two capital allowance computations are required, one for the first 12
months of the long period of account and one for the remaining period.
The first capital allowances computation will show the normal AIA, FYA and
WDAs. The balance period will be a short period of account and the AIA and
WDA must therefore be time-apportioned. As always, FYAs and balancing
adjustments are not subject to time apportionment.
The capital allowances of both periods are deducted from the one adjusted profit
before capital allowances figure and then the basis of assessment rules are
applied to the adjusted profit after capital allowances.