There are following set of Database Tables Store Sales Tax and Its related Data
sales_order_tax_item
tax_calculation
tax_calculation_rate
tax_calculation_rate_title
tax_calculation_rule
tax_class
tax_order_aggregated_created
tax_order_aggregated_updated
Magento 2 All Database Tables [500 and more Tables]
Which Magento 2 Database Tables Store Sales Order Data
Which Magento 2 Database Tables Store Sales Invoice Order Data
Which Magento 2 Database Tables Store Sales Tax and Its related Data
Which Magento 2 Database Tables Store Catalog Price Rules
Which Magento 2 Database Tables Store Cart Price Rules
Which Magento 2 Database Tables Store Shopping Cart Items
Which Magento 2 Database Table Store Sales Payment Transaction
Which Magento 2 Database Table store Sales Paypal Settlement Report
Which Magento 2 Database Table store Sales Paypal Payment Transaction