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Yes - Not sure how you are sending it but see here for REST API invoice fields: <https://system.netsuite.com/help/helpcenter/en_US/APIs/REST_API_Browser/record/v1/2023.1/index.html#/definitions/invoice>
You would either have a special tax code, or trigger override and send in whatever SF Billing has. I do not know that platform specifically but I would assume they had integrated with Netsuite before and maybe had some best practice? :slightly_smiling_face:

That depends if you are on legacy tax, suitetax, or e.g. avalara - its not just the amount its combination of override flag and/or the line fields for tax code etc.