Income Tax Calculator API

Overview

To use Income 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/incometaxcalculator

Example

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

curl -X GET \
  "https://api.apiverve.com/v1/incometaxcalculator?income=85000&rate=22&deduction=14600" \
  -H "X-API-Key: your_api_key_here"

const response = await fetch('https://api.apiverve.com/v1/incometaxcalculator?income=85000&rate=22&deduction=14600', {
  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/incometaxcalculator?income=85000&rate=22&deduction=14600', 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/incometaxcalculator?income=85000&rate=22&deduction=14600", 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": {
    "year": 2025,
    "filing_status": "single",
    "income": 85000,
    "standardDeduction": 15000,
    "taxableIncome": 70000,
    "totalTax": 10852.5,
    "effectiveRate": "12.77%",
    "marginalRate": "22%",
    "incomeAfterTax": 74147.5,
    "monthlyTax": 904.38,
    "monthlyIncome": 6178.96,
    "brackets": [
      {
        "rate": 0.1,
        "ratePercent": "10.0%",
        "rangeMin": 0,
        "rangeMax": 11925,
        "taxableAmount": 11926,
        "taxAmount": 1192.6
      },
      {
        "rate": 0.12,
        "ratePercent": "12.0%",
        "rangeMin": 11926,
        "rangeMax": 48475,
        "taxableAmount": 36550,
        "taxAmount": 4386
      },
      {
        "rate": 0.22,
        "ratePercent": "22.0%",
        "rangeMin": 48476,
        "rangeMax": 103350,
        "taxableAmount": 21524,
        "taxAmount": 4735.28
      }
    ]
  }
}

Authentication

The Income 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 Income Tax Calculator API directly in your browser with live requests and responses.

Parameters

The Income Tax Calculator API supports multiple query options. Use one of the following:

Response

The Income 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>
    <year>2025</year>
    <filing_status>single</filing_status>
    <income>85000</income>
    <standardDeduction>15000</standardDeduction>
    <taxableIncome>70000</taxableIncome>
    <totalTax>10852.5</totalTax>
    <effectiveRate>12.77%</effectiveRate>
    <marginalRate>22%</marginalRate>
    <incomeAfterTax>74147.5</incomeAfterTax>
    <monthlyTax>904.38</monthlyTax>
    <monthlyIncome>6178.96</monthlyIncome>
    <brackets>
      <bracket>
        <rate>0.1</rate>
        <ratePercent>10.0%</ratePercent>
        <rangeMin>0</rangeMin>
        <rangeMax>11925</rangeMax>
        <taxableAmount>11926</taxableAmount>
        <taxAmount>1192.6</taxAmount>
      </bracket>
      <bracket>
        <rate>0.12</rate>
        <ratePercent>12.0%</ratePercent>
        <rangeMin>11926</rangeMin>
        <rangeMax>48475</rangeMax>
        <taxableAmount>36550</taxableAmount>
        <taxAmount>4386</taxAmount>
      </bracket>
      <bracket>
        <rate>0.22</rate>
        <ratePercent>22.0%</ratePercent>
        <rangeMin>48476</rangeMin>
        <rangeMax>103350</rangeMax>
        <taxableAmount>21524</taxableAmount>
        <taxAmount>4735.28</taxAmount>
      </bracket>
    </brackets>
  </data>
</response>

status: ok
error: null
data:
  year: 2025
  filing_status: single
  income: 85000
  standardDeduction: 15000
  taxableIncome: 70000
  totalTax: 10852.5
  effectiveRate: 12.77%
  marginalRate: 22%
  incomeAfterTax: 74147.5
  monthlyTax: 904.38
  monthlyIncome: 6178.96
  brackets:
    - rate: 0.1
      ratePercent: 10.0%
      rangeMin: 0
      rangeMax: 11925
      taxableAmount: 11926
      taxAmount: 1192.6
    - rate: 0.12
      ratePercent: 12.0%
      rangeMin: 11926
      rangeMax: 48475
      taxableAmount: 36550
      taxAmount: 4386
    - rate: 0.22
      ratePercent: 22.0%
      rangeMin: 48476
      rangeMax: 103350
      taxableAmount: 21524
      taxAmount: 4735.28

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 Income Tax Calculator through GraphQL to combine it with other API calls in a single request. Query only the income 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 {
  incometaxcalculator(
    input: {
      income: 85000
      rate: 22
      deduction: 14600
    }
  ) {
    year
    filing_status
    income
    standardDeduction
    taxableIncome
    totalTax
    effectiveRate
    marginalRate
    incomeAfterTax
    monthlyTax
    monthlyIncome
    brackets
  }
}

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

CORS Support

The Income 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

Income 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 Income 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 Income Tax Calculator

Official Income 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

Income 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

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