You can easily enable Sales Tax support in Commerce Sync during the activation process or after activation is complete.
Does Commerce Sync support multiple tax rates?
Set-Up During Activation: If you have the Tax Rates set up in your point of sale and in your accounting solution, tax support is verified and enabled during activation. Easy!
Set-Up Post-Activation: If you did not have Sales Tax setup in your accounting solution when you activated Commerce Sync, you can enable Sales Tax in Commerce Sync Dashboard > Manage Settings > check the Transfer Sales Tax box.