Symmetry Tax Engine
Symmetry Tax Engine calculates gross-to-net payroll taxes for teams building, embedding, or scaling payroll platforms.
What Symmetry Tax Engine is
Symmetry Tax Engine calculates gross-to-net payroll taxes for teams building, embedding, or scaling payroll platforms. It covers federal, state, local, and employer taxes across all 50 U.S. states, U.S. territories including Puerto Rico, and Canada, with calculations for more than 7,000 taxing jurisdictions. Supported categories include federal withholding, FICA, paid family and medical leave, state disability and unemployment taxes, benefits and pre-tax benefit rules, and local taxes such as city, county, school district, and municipality taxes. It is available as a hosted Web API or an on-premise SDK installed in a customer’s environment. The Web API and SDK support JSON and XML; SDK interfaces include C/C++, Java, .NET, .NET Core, and Delphi. The on-premise SDK is released monthly, with interim releases when tax changes are more frequent; Web API updates are more frequent. Pricing is on request, and there is no free plan, though a free trial is available by contacting Symmetry. Symmetry is headquartered in Scottsdale, Arizona, and was founded in 1984.
Good
- Covers more than 7,000 taxing jurisdictions.
- Supports hosted API and on-premise SDK deployment.
- Includes federal, state, local, and employer taxes.
- SDK supports Windows, Linux, and macOS.
- Free trial is available by contacting Symmetry.
Watch out
- No free plan is listed.
- Pricing requires a request.
Who it suits
It suits software developers, payroll or HR providers, large employers, payroll managers, entrepreneurs, and payment companies that need payroll tax calculations across many jurisdictions.
Verdict
Symmetry Tax Engine offers broad payroll tax coverage through hosted and on-premise options. Buyers should request pricing and clarify trial terms with Symmetry.
Plans and prices
From Symmetry Tax Engine's own pricing page, checked 10 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Symmetry Tax Engine | Priced on request | Tailored pricing based on product needs and usage; tax updates, implementation, and support included |
The facts
Each one read from Symmetry Tax Engine's own pages, with the date it was checked.
What it does
- AI tools
- The product page describes an MCP interface for querying the production tax engine from Claude, Cursor, Copilot, and ChatGPT; it is read-only by design.checked 10 Oct 2026
- API access
- Yeschecked 20 Sep 2026
- API security and data
- The product page says API communications are encrypted in transit and the engine does not store personal data; it stores anonymized usage metrics.checked 10 Oct 2026
- Deployment
- The engine is available as a hosted Web API or an on-premise SDK installed in the customer's local environment.checked 10 Oct 2026
- Integrations
- The Web API supports secure HTTPS with JSON and XML, while the SDK offers interfaces including C/C++, Java, .NET, .NET Core, and Delphi.checked 10 Oct 2026
- Intended users
- Symmetry lists software developers, payroll or HR service providers, large employers, payroll managers, entrepreneurs, and payment companies as potential users.checked 10 Oct 2026
- Interfaces and operating systems
- Its technical information lists JSON and XML for the Web API and SDK, plus SDK support for Windows, Linux, and macOS.checked 10 Oct 2026
- Jurisdictions covered
- 7000checked 20 Sep 2026
- Performance and uptime
- The product page reports an average calculation time of 3.32 milliseconds and 99.99% uptime.checked 10 Oct 2026
- Purpose
- Symmetry Tax Engine is a gross-to-net payroll tax calculation engine for building, embedding, and scaling payroll platforms.checked 10 Oct 2026
- Security compliance
- Symmetry says it is SOC 2 Type 2 compliant and lists TLS 1.3 for data in transit and AES-256 encryption at rest in AWS.checked 10 Oct 2026
- Support
- Symmetry says support includes help with tax accuracy, jurisdiction questions, API and SDK integrations, onboarding, and filing guidance.checked 10 Oct 2026
- Supported tax types
- Federal withholding; FICA; paid family and medical leave; SDI/VDI/employee SUI; courtesy withholding; FUTA; SUTA; benefits and pre-tax benefit rules; city; county; school district; municipality; earned income; privilege; local services; JEDDs/JEDZchecked 20 Sep 2026
- Tax coverage
- It covers federal, state, local, and employer taxes across all 50 U.S. states, U.S. territories including Puerto Rico, and Canada.checked 10 Oct 2026
- Tax jurisdictions
- The product calculates taxes for over 7,000 taxing jurisdictions.checked 10 Oct 2026
- Updates
- The on-premise SDK is released monthly with interim releases when tax changes are more frequent, and Web API updates are released more frequently.checked 10 Oct 2026
The company
- Founded
- 1984checked 28 Sep 2026
- Headquarters
- Scottsdale, Arizona, United Stateschecked 28 Sep 2026
Money
- Free plan
- Nochecked 20 Sep 2026
- Trial
- The product FAQ invites prospective customers to contact Symmetry to learn about its free trial; it does not state a trial duration.checked 10 Oct 2026
