If you are filing your US federal income taxes and are taking the state sales tax deduction, you can use the report tool to quickly and easily calculate how much sales tax you paid on Amazon.com.
To get the .csv report go to Order History Reports and select the “Items” Report Type, along with a start and end date, or simply press one of the “Quick Set Options” such as “Last Year”. After the report finishes generating you can open it in excel or numbers and add a footer field where you can calculate the SUM of the “Item Subtotal Tax” and “Item Total” columns.
Next, generate a report with the “Refunds” Report Type and subtract those totals from your Items’ totals. If you have a business and you are calculating personal sales tax deductions you will need to remove any business expenses you might have mixed in. Also, if you are filing jointly or with dependents you should get a copy of your spouses and dependent’s reports as well.