Sales Tax Lookup

Overview

Look up sales tax by ZIP code for a checkout, an invoice or a POS setup screen. A ZIP code returns the estimated combined rate for that area, and a state code returns the statewide base rate. ZIP+4 codes are accepted. Each response names the city and state. Paid plans break the combined rate into its state, county, city and special district parts, add the tax region name, and say whether the state sources in-state sales at origin or destination, which decides whose local rate a seller charges. To apply the rate to an order, the Sales Tax Calculator API returns the tax amount and total in the same call.

Live Test Sales Tax Lookup API →

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

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curl "https://api.apiverve.com/v1/salestax?zip=64082" \
  -H "x-api-key: your_api_key_here"

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const res = await fetch('https://api.apiverve.com/v1/salestax?zip=64082', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

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import requests

res = requests.get(
    "https://api.apiverve.com/v1/salestax?zip=64082",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

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package main

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

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/salestax?zip=64082", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

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{
  "status": "ok",
  "error": null,
  "data": {
    "state": "CA",
    "zip": 90210,
    "region": "WEST HOLLYWOOD TOURISM IMPROVEMENT DISTRICT",
    "rate": 0.1025,
    "county": 0.0025,
    "city": 0.0075,
    "special": 0.0325,
    "stateRate": 0.06,
    "cityName": "Beverly Hills",
    "stateName": "California",
    "sourcing": "mixed"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Use cases

Online Store Checkout

When a customer enters their shipping ZIP code, e-commerce checkouts apply the matching combined rate to calculate cart totals.

Automated Invoice Generation

B2B billing platforms look up state tax rates to append accurate tax line items to monthly customer invoices.

Point of Sale Calculation

Retail POS systems query store location ZIP codes during setup to store local tax percentages for offline transactions.

Subscription Billing Quotes

SaaS quote generators calculate estimated local taxes before sending multi-state sales proposals to prospective corporate clients.

Other ways to use Sales Tax Lookup

Set up Sales Tax Lookup on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

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