configuratorware offers the possibility to work either with gross prices, net prices, or both.
You can edit both types in the adminarea / provide them via import:
Example: Price editing for a creator option.
If you want configuratorware to display the net prices, you can use the _display_net_prices=1 parameter (see https://demos.configuratorware.com/docs/integration/opening.html).
Depending on which prices you provide you get them as a result for instance in the mighty https://[configuratorURL]/frontendapi/configuration/loadconfigurationinfo/{code} call:
Note: configuratorware does not calculate gross from net or net from gross via a VAT rate to make sure that ther is no difference to the calculation of your leading system (e.g. Shop / PIM).