AssetAccountant™ will ensure your tax cost base and the accounting revaluation amounts are correct.
AA's Import feature allows you to import previously revalued assets.
As part of this process, a revaluation reserve is created for the asset (where appropriate), based on the data you provide at when you bring assets into AssetAccountant with the Import Assets wizard:
You'll need to select 'Yes' when asked 'Are there any revalued assets?' on the second step of the Import process:
If you are also depreciating the asset for tax and have previously revalued the accounting cost of the asset they you will also need to say Yes to the question of "Different Cost/First Use per regime:
After mapping your tax and accounting methods, you'll be presented with a screen asking for revaluation data. You will need to ensure that this data is present in your import spreadsheet: