When AssetAccountant calculates taxable depreciation, it is based on a proportion of the depreciation that would have applied if the taxable use was 100%.
So, for example, if a $20,000 asset was depreciating over 4 years and had taxable use of 50% over that entire period, we'd expect to see:
| Year | Tax Value | Depreciation | Taxable Depreciation |
| 1 | $20,000 | $5,000 | $2,500 |
| 2 | $15,000 | $5,000 | $2,500 |
| 3 | $10,000 | $5,000 | $2,500 |
| 4 | $5,000 | $5,000 | $2,500 |
| $0 |
So the basis for assessing tax value (as opposed to what's claimable) is always the full cost.
When importing into AssetAccountant, it's important to keep this in mind, so if we were to import this asset halfway through its life, we'd import it with an opening balance of $10,000.