Hi Bob,

You can go through this documentation, Hope it will help.

https://www.odoo.com/documentation/user/11.0/accounting/others/taxes/cash_basis_taxes.html#what-is-the-impact-of-cash-basis-taxes-in-my-accounting

Thanks.

The VAT report shows the values for your tax codes. Direct postings to accounts without tax codes do not show in the VAT report. In order to properly handle VAT for different use cases, it is best to create corresponding products with tax codes. Please read the documentation about tax handling.