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Symmetry Docs

Developer documentation and API references for Symmetry's payroll tax engine, payroll forms, I-9 verification, payroll point, minimum wage finder, and paycheck calculators.

For agents: Developer docs for Symmetry Tax Engine: hosted payroll tax API and on-premise Java SDK, plus payroll forms, I-9 verification and paycheck calculator references.

payroll tax enginepayroll tax apiwithholding calculationi-9 verificationminimum wage finderjava sdk

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# Symmetry Docs

> Developer documentation and API references for Symmetry's payroll tax engine, payroll forms, I-9 verification, payroll point, minimum wage finder, and paycheck calculators.

- [What is the Symmetry Tax Engine?](https://docs.symmetry.com/ste/overview/what-is-the-ste.md): Precise federal, state, and local payroll tax calculations for the U.S. and Canada.
- [Ways to use the STE](https://docs.symmetry.com/ste/overview/ways-to-use.md): The five interfaces available for accessing the Symmetry Tax Engine.
- [Hosted API vs. on-premise SDK](https://docs.symmetry.com/ste/overview/hosted-vs-on-premise.md): Choosing between the STE Hosted API and the locally installed on-premise SDK.
- [Tax coverage](https://docs.symmetry.com/ste/overview/coverage.md): The jurisdictions and tax types the Symmetry Tax Engine covers across the U.S. and Canada.
- [Platform and language support](https://docs.symmetry.com/ste/overview/platform-and-language-support.md): Supported operating systems, architectures, languages, and sizing guidance for the On-Premise STE.
- [Licensing](https://docs.symmetry.com/ste/overview/licensing.md): How STE licensing and authentication work across the hosted API, on-premise SDK, and AI interfaces.
- [Hosted API quickstart](https://docs.symmetry.com/ste/quickstarts/hosted-api-quickstart.md): Calculate withholding for one employee with a single JSON request to the hosted STE web service.
- [Java SDK quickstart](https://docs.symmetry.com/ste/quickstarts/java-sdk-quickstart.md): Embed the STE native library and calculate withholding for one employee with the Java SDK.
- [.NET SDK quickstart](https://docs.symmetry.com/ste/quickstarts/dotnet-sdk-quickstart.md): Embed the STE native library and calculate withholding for one employee with the .NET SDK.
- [C SDK quickstart](https://docs.symmetry.com/ste/quickstarts/c-sdk-quickstart.md): Link the native STE library and calculate withholding for one employee with the C API.
- [Canadian payroll quickstart](https://docs.symmetry.com/ste/quickstarts/canadian-payroll-quickstart.md): Run a Canadian payroll calculation in the Symmetry Tax Engine — authenticate, send one request, and read the withholding.
- [How the STE works](https://docs.symmetry.com/ste/core-concepts/how-it-works.md): The STE calculation model from address to withholding, end to end.
- [Wage types](https://docs.symmetry.com/ste/core-concepts/wage-types.md): The categories of wages the STE recognizes and why they matter.
- [Time periods (CTD, MTD, QTD, YTD)](https://docs.symmetry.com/ste/core-concepts/time-periods.md): The input-vs-output convention for period-to-date amounts, and why it matters.
- [Configure, then calculate](https://docs.symmetry.com/ste/core-concepts/configure-then-calculate.md): The two-phase workflow behind every STE calculation: gather the inputs that describe a paycheck, then run the engine against them.
- [STE Hosted API overview](https://docs.symmetry.com/ste/api-reference/overview.md): Base URLs, auth
…

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