You can go wrong from step one.
The easiest way to keep the overview and reduce expenses for the tax advisor is to keep and build up lists, and databases for incoming and outgoing invoices.
This is a simple yet often undervalued step or the format of your lists is not perfect for the purpose. Your lists may not show up to their full potential. We have seen solutions rather in a view format than in a logical format to get the best results.
We have seen clients with and without control over their incoming and outgoing invoices. In most cases, this can be optimized.