How is the tax information managed between Procore & QBO?

The integration transfers Tax Codes from Procore to QBO as well as from QBO to Procore. 

To be able to sync the Tax Codes, they need to be mapped within Tax Codes Mapping section in your integration.

Requirement: 1-to-1 mapping between the tax codes.

Note: Procore stores only Tax Codes, not the Tax Values.