Sales Tax CalculatorSales Tax Calculator API

OnlineCredit Usage:1 per callRefreshed 1 month ago
avg: 120ms|p50: 116ms|p75: 123ms|p90: 132ms|p99: 149ms

Sales Tax Calculator computes the exact sales tax amount for purchases in any US state or ZIP code. Get accurate tax calculations with breakdowns by state, county, city, and special district rates.

The Sales Tax Calculator API provides reliable and fast access to sales tax calculator data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.

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

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

Code Examples

Here are examples of how to call the Sales Tax Calculator API in different programming languages:

cURL Request
curl -X GET \
  "https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA" \
  -H "X-API-Key: your_api_key_here"
JavaScript (Fetch API)
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);
Python (Requests)
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)
Node.js (Native HTTPS)
const https = require('https');
const url = require('url');

const options = {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
};

const req = https.request('https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA', options, (res) => {
  let data = '';
  res.on('data', (chunk) => data += chunk);
  res.on('end', () => console.log(JSON.parse(data)));
});

req.end();
PHP (cURL)
<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'X-API-Key: your_api_key_here',
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);
print_r($data);

?>
Go (net/http)
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))
}
Ruby (Net::HTTP)
require 'net/http'
require 'json'

uri = URI('https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'

response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))
C# (HttpClient)
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        using var client = new HttpClient();
        client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key_here");

        var response = await client.GetAsync("https://api.apiverve.com/v1/salestaxcalculator?amount=100&zip=90210&state=CA");
        response.EnsureSuccessStatusCode();

        var responseBody = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseBody);
    }
}

Authentication

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

Required 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:

Calculate Sales Tax

ParameterTypeRequiredDescriptionDefaultExample
amountnumberrequired
Purchase amount to calculate tax on
Range: min: 0
-100
zipstringrequired
Valid US 5-digit ZIP code
Length: 5 - 5 chars
-90210
statestringoptional
2-letter US state code (e.g., CA, NY, TX)
Length: 2 - 2 chars
-CA

Response

The Sales Tax Calculator API returns responses in JSON, XML, YAML, and CSV formats:

Example Responses

JSON Response
200 OK
{
  "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
    }
  }
}
XML Response
200 OK
<?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>
YAML Response
200 OK
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
CSV Response
200 OK
keyvalue
amount100
taxRate0.0975
taxRatePercent9.75
taxAmount9.75
totalAmount109.75
zip90210
stateCA
regionBeverly 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:

FieldTypeDescriptionExample
statusstringIndicates whether the request was successful ("ok") or failed ("error")ok
errorstring | nullContains error message if status is "error", otherwise nullnull
dataobject | nullContains the API response data if successful, otherwise null{...}

Learn more about response formats →

Response Data Fields

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

Response fields marked with Premium are available exclusively on paid plans.View pricing
FieldTypeSample ValueDescription
amountnumber100The original purchase amount before tax
taxRatenumber0.0975Decimal tax rate applied to location
taxRatePercentnumber9.75Tax rate expressed as percentage
taxAmountnumber9.75Calculated tax amount for purchase
totalAmountnumber109.75Total amount including tax
zipstring"90210"ZIP code used for tax calculation
statestring"CA"State code used for tax lookup
regionPremiumstring"Beverly Hills"City or region name for location
breakdownPremiumobject{...}Detailed tax rate breakdown by category
â”” stateRatenumber0.0725State-level tax rate component
â”” countyRatenumber0.0025County-level tax rate component
â”” cityRatenumber0.0125City-level tax rate component
â”” specialRatenumber0.01Special district tax rate component

Headers

Required and optional headers for Sales Tax Calculator API requests:

Header NameRequiredExample ValueDescription
X-API-Keyrequiredyour_api_key_hereYour APIVerve API key. Found in your dashboard under API Keys.
Acceptoptionalapplication/jsonSpecify response format: application/json (default), application/xml, or application/yaml
User-AgentoptionalMyApp/1.0Identifies your application for analytics and debugging purposes
X-Request-IDoptionalreq_123456789Custom request identifier for tracking and debugging requests
Cache-Controloptionalno-cacheControl caching behavior for the request and response

Learn more about 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.

Test Sales Tax Calculator in the GraphQL Explorer to confirm availability and experiment with queries.

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

GraphQL Endpoint
POST https://api.apiverve.com/v1/graphql
GraphQL Query Example
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 supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call Sales Tax Calculator directly from browser-based applications without proxy servers.

CORS HeaderValueDescription
Access-Control-Allow-Origin*Accepts requests from any origin
Access-Control-Allow-Methods*Accepts any HTTP method
Access-Control-Allow-Headers*Accepts any request headers

Browser Usage: You can call Sales Tax Calculator directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.

Learn more about CORS support →

Rate Limiting

Sales Tax Calculator API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all Sales Tax Calculator users.

PlanRate LimitDescription
Free5 requests/minHard rate limit enforced - exceeding will return 429 errors
StarterNo LimitProduction ready - standard traffic priority
ProNo LimitProduction ready - preferred traffic priority
MegaNo LimitProduction ready - highest traffic priority

Learn more about rate limiting →

Rate Limit Headers

When rate limits apply, each Sales Tax Calculator response includes headers to help you track your usage:

HeaderDescription
X-RateLimit-LimitMaximum number of requests allowed per time window
X-RateLimit-RemainingNumber of requests remaining in the current window
X-RateLimit-ResetUnix timestamp when the rate limit window resets

Handling Rate Limits

Free Plan: When you exceed your rate limit, Sales Tax Calculator returns a 429 Too Many Requests status code. Your application should implement appropriate backoff logic to handle this gracefully.

Paid Plans: No rate limiting or throttling applied. All paid plans (Starter, Pro, Mega) are production-ready.

Best Practices for Sales Tax Calculator:

  • Monitor the rate limit headers to track your Sales Tax Calculator usage (Free plan only)
  • Cache sales tax calculator responses where appropriate to reduce API calls
  • Upgrade to Pro or Mega for guaranteed no-throttle Sales Tax Calculator performance

Note: Sales Tax Calculator rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using Sales Tax Calculator on Free tier.

Error Codes

The Sales Tax Calculator API uses standard HTTP status codes to indicate success or failure:

CodeMessageDescriptionSolution
200OKRequest successful, data returnedNo action needed - request was successful
400Bad RequestInvalid request parameters or malformed requestCheck required parameters and ensure values match expected formats
401UnauthorizedMissing or invalid API keyInclude x-api-key header with valid API key from dashboard
403ForbiddenAPI key lacks permission or insufficient creditsCheck credit balance in dashboard or upgrade plan
429Too Many RequestsRate limit exceeded (Free: 5 req/min)Implement request throttling or upgrade to paid plan
500Internal Server ErrorServer error occurredRetry request after a few seconds, contact support if persists
503Service UnavailableAPI temporarily unavailableWait and retry, check status page for maintenance updates

Learn more about error handling →

Need help? Contact support with your X-Request-ID for assistance.

Integrate Sales Tax Calculator with SDKs

Get started quickly with official Sales Tax Calculator SDKs for your preferred language. Each library handles authentication, request formatting, and error handling automatically.

Available for Node.js, Python, C#/.NET, and Android/Java. All SDKs are open source and regularly updated.

Integrate Sales Tax Calculator with No-Code API Tools

Connect the Sales Tax Calculator API to your favorite automation platform without writing code. Build workflows that leverage sales tax calculator data across thousands of apps.

All platforms use your same API key to access Sales Tax Calculator. Visit our integrations hub for step-by-step setup guides.

Frequently Asked Questions

How do I get an API key for Sales Tax Calculator?
Sign up for a free account at dashboard.apiverve.com. Your API key will be automatically generated and available in your dashboard. The same key works for Sales Tax Calculator and all other APIVerve APIs. The free plan includes 1,000 credits plus a 500 credit bonus.
How many credits does Sales Tax Calculator cost?

Each successful Sales Tax Calculator API call consumes credits based on plan tier. Check the pricing section above for the exact credit cost. Failed requests and errors don't consume credits, so you only pay for successful sales tax calculator lookups.

Can I use Sales Tax Calculator in production?

The free plan is for testing and development only. For production use of Sales Tax Calculator, upgrade to a paid plan (Starter, Pro, or Mega) which includes commercial use rights, no attribution requirements, and guaranteed uptime SLAs. All paid plans are production-ready.

Can I use Sales Tax Calculator from a browser?
Yes! The Sales Tax Calculator API supports CORS with wildcard configuration, so you can call it directly from browser-based JavaScript without needing a proxy server. See the CORS section above for details.
What happens if I exceed my Sales Tax Calculator credit limit?

When you reach your monthly credit limit, Sales Tax Calculator API requests will return an error until you upgrade your plan or wait for the next billing cycle. You'll receive notifications at 80% and 95% usage to give you time to upgrade if needed.

What's Next?

Continue your journey with these recommended resources

Was this page helpful?