Sales Tax Rates API Documentation

Explore our complete reference for the U.S. Sales Tax Rates API — designed to help developers and businesses access accurate, up-to-date sales tax data by ZIP code, city, and county across all 50 states.

Whether you're building an eCommerce platform, tax calculator, POS system, or financial application, our REST API makes integration fast and reliable.

📁 Prefer a file download? Download the full CSV of U.S. ZIP code tax rates, updated monthly for accuracy.

API docs by Redocly

Tax API (1.0.0)

Download OpenAPI specification:Download

An API to get tax rates

Returns a token.

The token expires in 10 minutes.

Request Body schema: application/json
required
email
required
string
password
required
string

Responses

Request samples

Content type
application/json
{
  • "email": "djohnson@company.com",
  • "password": "123!@#$Asdf"
}

Response samples

Content type
application/json
{
  • "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjY2OTg1OTViZmQzMDA5N2M2NTIxNDA1NSIsImlhdCI6MTcyMTM0Nzg4N"
}

Get tax rate by zipcode

path Parameters
zipcode
required
string

The 5-digit zipcode

query Parameters
county
string

Optional county name to filter the results

city
string

Optional city name to filter the results

Responses

Response samples

Content type
application/json
[
  • {
    }
]

Get tax rate by state

path Parameters
state
required
string

The state

Responses

Response samples

Content type
application/json
{
  • "state_tax_rate": 0.0425,
  • "min_county_tax_rate": 0.0125,
  • "max_county_tax_rate": 0.0225,
  • "min_city_tax_rate": 0.0025,
  • "max_city_tax_rate": 0.0125
}

Calculate sales tax amount for a given zipcode and sale amount

query Parameters
county
string

Optional county filter

city
string

Optional city filter

Request Body schema: application/json
required
zipcode
required
string
amount
required
number

Responses

Request samples

Content type
application/json
{
  • "zipcode": "37862",
  • "amount": 100
}

Response samples

Content type
application/json
{
  • "zipcode": "37862",
  • "amount": 100,
  • "combined_sales_tax": 0.1125,
  • "tax_amount": 11.25
}