Income Tax Calculator

Income Tax Calculator is an API service designed to compute US federal income tax based on user-provided inputs. It processes income, filing status, and tax year to determine total tax liability, effective tax rate, marginal tax rate, and provides a detailed breakdown by tax bracket. This tool is intended for integration into applications, making it suitable for developers who need to automate or embed tax calculation capabilities within their software.

The API operates via a GET request to a specified endpoint and supports several response formats, including JSON, XML, and YAML. Users can experiment with live requests directly from the documentation page without requiring an API key for initial testing, while access for application integration is secured with an API key. Example code snippets are provided for cURL, Node, and Python, streamlining the process of embedding the calculator into various development environments.

The service is available online and maintains a stated uptime SLA of 99.9%. Usage is metered on a per-call basis, with each request consuming one credit. The API also offers low latency, with performance metrics such as p50, p75, p90, and p99 latency percentiles provided. There is no mention of specific licensing terms or pricing details in the available information, but users are encouraged to start for free, suggesting the existence of a free trial or tier.

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