Amazon's Tax Calculation Service has a custom rate option that can be set by state. A seller-defined custom rate for a state will override the tax rate supplied by our third party tax software provider for that state. A seller-defined custom rate will not override A_GEN_NOTAX.
To specify a custom rate for individual states, do the following:
The new or updated tax settings should become effective in 5 hours, but could take as long as 48 hours after successful confirmation.
While Amazon's Tax Calculation Service provides a means to determine and apply taxes to orders, sellers are responsible for reviewing and determining the correct product tax codes, calculation settings, and all related information for their products. Sellers are also responsible for documenting and paying all taxes to the appropriate taxing authorities for their transactions. This applies to both Amazon-fulfilled and seller-fulfilled products. If you have additional questions about tax calculation, we suggest seeking assistance from your tax adviser.