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Qualifying expenditure must be pooled to arrive at writing-down allowances and balancing allowances or charges¹. Expenditure for separate qualifying activities must be allocated to separate pools². There are single asset pools, class pools and the main pool³.

A single asset pool cannot contain expenditure in respect of more than one asset⁴. The provisions which determine if qualifying expenditure has to be allocated to a single asset pool relate to⁵:

1. Ìý

   •ÌýÌýÌýÌý short-life assets (see B3.343)

2. Ìý

   •ÌýÌýÌýÌý ships (see B3.344, B3.350, B3.351)

3. Ìý

   •ÌýÌýÌýÌý plant or machinery provided or used partly for purposes other than those of a qualifying activity (see B3.359)

4. Ìý

   •ÌýÌýÌýÌý payment of partial depreciation subsidy (see B3.360)

5. Ìý

   •ÌýÌýÌýÌý contribution allowances (see B3.112)

Similar provision is made for class pools⁶. A class pool may contain expenditure relating to more than one asset. Only special rate expenditure (see below) is now allocated to a class pool (the 'special rate pool')⁷.