Sales Tax Calculator API

Overview

To use Sales Tax Calculator, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

https://api.apiverve.com/v1/salestaxcalculator

Example

How to call the Sales Tax Calculator API in different programming languages.

curl -X GET \
  "https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA" \
  -H "X-API-Key: your_api_key_here"

const response = await fetch('https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA', headers=headers)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA", nil)

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "status": "ok",
  "error": null,
  "data": {
    "amount": 100,
    "taxRate": 0.0975,
    "taxRatePercent": 9.75,
    "taxAmount": 9.75,
    "totalAmount": 109.75,
    "zip": "90210",
    "state": "CA",
    "region": "Beverly Hills",
    "breakdown": {
      "stateRate": 0.0725,
      "countyRate": 0.0025,
      "cityRate": 0.0125,
      "specialRate": 0.01
    }
  }
}

Authentication

The Sales Tax Calculator API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Sales Tax Calculator API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Sales Tax Calculator API:

Response

The Sales Tax Calculator API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <amount>100</amount>
    <taxRate>0.0975</taxRate>
    <taxRatePercent>9.75</taxRatePercent>
    <taxAmount>9.75</taxAmount>
    <totalAmount>109.75</totalAmount>
    <zip>90210</zip>
    <state>CA</state>
    <region>Beverly Hills</region>
    <breakdown>
      <stateRate>0.0725</stateRate>
      <countyRate>0.0025</countyRate>
      <cityRate>0.0125</cityRate>
      <specialRate>0.01</specialRate>
    </breakdown>
  </data>
</response>

status: ok
error: null
data:
  amount: 100
  taxRate: 0.0975
  taxRatePercent: 9.75
  taxAmount: 9.75
  totalAmount: 109.75
  zip: '90210'
  state: CA
  region: Beverly Hills
  breakdown:
    stateRate: 0.0725
    countyRate: 0.0025
    cityRate: 0.0125
    specialRate: 0.01

Response Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access Sales Tax Calculator through GraphQL to combine it with other API calls in a single request. Query only the sales tax calculator data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  salestaxcalculator(
    input: {
      amount: 100
      zip: "90210"
      state: "CA"
    }
  ) {
    amount
    taxRate
    taxRatePercent
    taxAmount
    totalAmount
    zip
    state
    region
    breakdown {
      stateRate
      countyRate
      cityRate
      specialRate
    }
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Sales Tax Calculator API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

Sales Tax Calculator requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The Sales Tax Calculator API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for Sales Tax Calculator

Official Sales Tax Calculator packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

Sales Tax Calculator works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

Frequently Asked Questions

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