Freedom251 › Tax Compliance Software
Symmetry Tax Engine
What Symmetry Tax Engine is
Symmetry Tax Engine calculates gross-to-net payroll taxes for platforms that need to build, embed, or scale payroll capabilities. It covers federal, state, local, and employer taxes across all 50 U.S. states, U.S. territories including Puerto Rico, and Canada, spanning more than 7,000 taxing jurisdictions. Listed tax categories include federal withholding, FICA, paid family and medical leave, disability and unemployment taxes, benefits and pre-tax rules, and multiple local taxes. The engine is available as a hosted Web API or as an on-premise SDK installed in a customer's environment. The Web API supports JSON and XML; the SDK supports Windows, Linux, and macOS and lists interfaces for several programming languages and frameworks. Symmetry says API communications are encrypted in transit and the engine does not store personal data, though it retains anonymized usage metrics. It also describes SOC 2 Type 2 compliance and encryption protections. Pricing is available on request, with tailored pricing based on product needs and usage. Symmetry is headquartered in Scottsdale, Arizona, and was founded in 1984.
Who it suits
The engine may suit software developers, payroll or HR service providers, large employers, payroll managers, entrepreneurs, and payment companies needing payroll tax calculations across many jurisdictions.
What it does well
- Covers more than 7,000 taxing jurisdictions.
- Hosted Web API and on-premise SDK options.
- Supports Windows, Linux, and macOS SDKs.
- Free trial is available by contacting Symmetry.
What to know first
- No free plan; product is paid.
- Pricing is available only on request.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Symmetry Tax Engine | Tailored pricing based on product needs and usage; tax updates, implementation, and support included | On request |
As symmetry.com lists them, read 10 Oct 2026. The maker's own page has the final word.
Getting started
- Visit https://www.symmetry.com/symmetry-tax-engine
- Contact Symmetry to discuss product needs, usage and the free trial
- Choose the hosted Web API or on-premise SDK deployment
- Integrate the Web API with secure HTTPS using JSON or XML, or use an SDK interface
- Use the supported operating system and programming interface for an SDK installation
- Work with Symmetry support on onboarding, integrations, tax accuracy and filing guidance
Verdict
Symmetry Tax Engine pairs broad payroll tax coverage with hosted API and on-premise deployment options. Organizations should contact Symmetry about trial access and tailored pricing.
Questions
Does Symmetry Tax Engine offer a free plan?
No. The product is paid, and pricing is available on request.
Is a free trial available?
Yes. Symmetry invites prospective customers to contact it about a free trial.
How can it be deployed?
It is available as a hosted Web API or an on-premise SDK installed in the customer’s local environment.
Which taxes and jurisdictions does it cover?
It covers federal, state, local and employer taxes across all 50 U.S. states, U.S. territories including Puerto Rico, and Canada, spanning more than 7,000 jurisdictions.
How is the API secured?
API communications are encrypted in transit, and the engine does not store personal data. Symmetry lists SOC 2 Type 2 compliance, TLS 1.3 and AES-256 encryption at rest in AWS.
Facts from Symmetry Tax Engine's own pages
- 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. · symmetry.com, 10 Oct 2026
- API access
- Yes · symmetry.com, 20 Sept 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. · symmetry.com, 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. · symmetry.com, 10 Oct 2026
- Founded
- 1984 · symmetry.com, 28 Sept 2026
- Free plan
- No · symmetry.com, 20 Sept 2026
- Headquarters
- Scottsdale, Arizona, United States · symmetry.com, 28 Sept 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. · symmetry.com, 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. · symmetry.com, 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. · symmetry.com, 10 Oct 2026
- Jurisdictions covered
- 7000 · symmetry.com, 20 Sept 2026
- Performance and uptime
- The product page reports an average calculation time of 3.32 milliseconds and 99.99% uptime. · symmetry.com, 10 Oct 2026
- Purpose
- Symmetry Tax Engine is a gross-to-net payroll tax calculation engine for building, embedding, and scaling payroll platforms. · symmetry.com, 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. · symmetry.com, 10 Oct 2026
- Support
- Symmetry says support includes help with tax accuracy, jurisdiction questions, API and SDK integrations, onboarding, and filing guidance. · symmetry.com, 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/JEDZ · symmetry.com, 20 Sept 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. · symmetry.com, 10 Oct 2026
- Tax jurisdictions
- The product calculates taxes for over 7,000 taxing jurisdictions. · symmetry.com, 10 Oct 2026
- Trial
- The product FAQ invites prospective customers to contact Symmetry to learn about its free trial; it does not state a trial duration. · symmetry.com, 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. · symmetry.com, 10 Oct 2026
Where Symmetry Tax Engine stands on Freedom251
- Tax Compliance Software#21 of 105
- Payroll Tax Software#13 of 31