PPOM Add-ons can have extra prices attached in the free version. Our customers are enjoying this feature with many PPOM input fields. Now we have added the Taxable feature in PPOM Option Prices. Yes, option prices now can be set taxable based on product and WooCommerce Tax settings. This feature is available since version 21.3.  To enable this feature make sure you check this settings from WooCommerce->Settings->PPOM Settings

When the above settings is enabled, PPOM option price will inherit WooCommerce Tax settings. Like if showing the price excluding or including on product page and cart pages.