Income Tax Calculator

Income Tax Calculator API

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Income Tax Calculator is a tool for calculating US federal income tax. It takes your income, filing status, and year to compute your total tax, effective rate, marginal rate, and a full bracket-by-bracket breakdown.

Online
1 credit/call
99.9% uptime
Docs
avg: 463ms|p50: 438ms|p75: 480ms|p90: 530ms|p99: 630ms
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Online
1 credit/call
99.9% uptime
Docs
avg: 463ms|p50: 438ms|p90: 530ms|p99: 630ms

Live Test API

Try out the Income Tax Calculator with a live request and see the response in real-time.

API Request

GET
https://api.apiverve.com
Parameters

API Response

200 OK
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{
  "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,
    "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
      }
    ]
  }
}

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Frequently Asked Questions

Get answers to common questions about the Income Tax Calculator API

What does the Income Tax Calculator API do?

Income Tax Calculator is a tool for calculating US federal income tax. It takes your income, filing status, and year to compute your total tax, effective rate, marginal rate, and a full bracket-by-bracket breakdown. The API returns structured data in JSON, XML, or YAML format, making it easy to integrate into any application or workflow.

How fast is the Income Tax Calculator API?

The Income Tax Calculator API has an average response time of 463ms, with a median (p50) of 438ms and 99th percentile of 630ms. Our infrastructure maintains 99.9% uptime with servers distributed globally for low latency.

How much does the Income Tax Calculator API cost?

Each call to the Income Tax Calculator API uses 1 credit. The free tier includes 100 credits per month. Paid plans start at $29.99/month with higher limits, and enterprise plans offer custom pricing with priority support.

How do I authenticate Income Tax Calculator API requests?

Include your API key in the request header as X-API-Key: your_key_here. All requests are made over HTTPS for security. You can get your API key by signing up for a free account.

What HTTP methods does Income Tax Calculator support?

The Income Tax Calculator API supports GET requests. Simply pass your parameters as query strings in the URL. Check our documentation for detailed parameter specifications.

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