
Chapter 6: Capital allowances – plant and machinery
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BA = balancing allowance
BC = balancing charge
TWDV = tax written down value: this represents the cost of the assets less the
capital allowances claimed on them so far. It is their written down value for tax
purposes.
3.3 Preparation of a capital allowances computation
There are seven key steps in preparing a computation of capital allowances. To
ensure that the rules for capital allowances are applied correctly, it is important to
follow these steps in the strict order shown below, and to set out the computations
for capital allowances using the proforma that is given here.
Step 1: Review additions to non-current assets in the accounting period
Decide whether the purchased asset is plant and machinery and therefore eligible
for capital allowances. Then decide the appropriate category of the asset and
therefore to which column the addition should be allocated.
If the asset does not qualify for an AIA or FYA, add the cost of the asset to the tax
written down value brought forward from the previous period (TWDV b/f) in the
appropriate column of the proforma.
The TWDV b/f, if applicable, will be given in the examination question.
Step 2: Bring in additions that qualify for the AIA and calculate the AIA
available
The cost of assets qualifying for the AIA should be entered as an addition in the
appropriate column, and the AIA entered as a deduction.
Step 3: Deal with disposals of plant and machinery in the accounting period
Capital allowances are given on the net cost of an asset. Therefore, when an asset
has been disposed of, the sale proceeds are deducted from the TWDV. This
deduction should be entered in the appropriate column of the proforma.
There are two exceptions to this rule:
If the asset was sold for more than its original cost, deduct the original cost
instead of the sale proceeds. (Never take out from a column more than the
amount that was originally put in.)
If the asset was given away (gifted) or sold for less than it was worth, the
amount of the deduction is the lower of:
− the full market value on the disposal date, and
− the original cost.
When a building is sold, the vendor and purchaser make a joint election to
determine how much of the sale proceeds is to be allocated to any fixtures included