Retainage is first configured on the Project window on the Setup tab. Here you can define a default retainage percentage and indicate whether or not the retainage is taxable. The default Retainage Taxable setting for new projects is set in the Division Master window.
The project setting is a default, however retainage can be identified as taxable or non-taxable at the point when the retainage is recognized.
The project default retainage is used when sections are added to the project. The retainage can then be modified by section as needed. Sections that existed on the project prior to setting the project default retainage will not be affected by the project default percentage.
When retainage is non-taxable the tax associated with the retainage is invoiced at the point when the retainage payment is due.