Symmetry Tax Engine
Symmetry Tax Engine: A broad payroll tax calculation engine for large systems, delivered by API or SDK. Ranked #22 of 31 in Payroll Tax Software by our editors (6.2/10); pricing: Pricing on request; best for large payroll systems needing tax calculation infrastructure.
At a glance
- Editor score6.2 / 10
- PricingPricing on request
- Best forLarge payroll systems needing tax calculation infrastructure
- Free planNo
- Founded1984 · Scottsdale, Arizona, United States
- Facts checked20 Sep 2026
Where it wins
- Calculates payroll taxes across 7,000+ jurisdictions
- Supports hosted Web API and on-premise SDK deployments
- Provides monthly and interim tax-rule updates
Where it doesn't
- Does not verify payroll tax filing or payment
- Pricing requires contacting sales
- No free plan is offered
Our verdict on Symmetry Tax Engine
Symmetry Tax Engine is payroll tax calculation infrastructure for developers, payroll providers, HR technology platforms, staffing and PEO services, and large employers. It calculates gross-to-net payroll taxes across federal, state, local, territorial, and Canadian jurisdictions. The product supports multi-state scenarios with reciprocity and nexus support, plus local tax determination based on home and work addresses. Its coverage includes federal withholding, FICA, FUTA, SUTA, paid family and medical leave, SDI/VDI and employee SUI, benefits and pre-tax benefit rules, and multiple city, county, school district, municipality, earned income, privilege, local services, and JEDD/JEDZ taxes.
Integration flexibility is a central strength. Organizations can use a hosted Web API or an on-premise SDK, with JSON and XML interfaces and support across Windows, macOS, and Linux. Web API clients receive a staging environment, while webhook notifications can signal tax-data changes. These options suit payroll and HR platforms that need to embed calculations into an existing product or retain more control over deployment. The published product details also describe multiple programming environments, making the engine appropriate for software teams building payroll workflows rather than for individual payroll administrators seeking a standalone filing application.
Pricing is tailored and requires contact with sales, and there is no free plan. The published offering focuses on tax calculation rather than end-to-end payroll compliance operations: Symmetry Tax Engine does not verify payroll tax filing or payment. That boundary matters when selecting the product. Choose it when broad jurisdictional coverage, recurring rule updates, and API or SDK delivery are the priorities. Look elsewhere when the primary requirement is a service that verifies payroll tax filing or payment alongside calculation. Symmetry Software has offered the product since 1984, and the platform includes both monthly and interim tax-rule updates for systems that need continuing tax-data maintenance.
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Symmetry Tax Engine pricing
Symmetry Tax Engine fact sheet
| Free plan | No |
|---|---|
| Paid from | Not verified |
| Tax filing | Not verified |
| Tax payment support | Not verified |
| Tax form preparation | Not verified |
| Jurisdiction coverage | Not verified |
| Tax reconciliation | Not verified |
| Year-end forms | Not verified |
| States covered | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Windows, macOS, Linux |
| Compliance & security | SOC 2 |
| Support | Email, Phone, Tickets, Docs |
| Built for | Mid-market, Enterprise (editorial estimate) |
| Pricing | Pricing on request (source) |
| Website | symmetry.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Symmetry Tax Engine
- TaxBanditsA low-cost U.S. payroll tax platform with federal, state, reconciliation, and API workflows.8.9
- Sovos Withholding ComplianceA mature withholding operations platform for complex federal, state and local workflows.8.7
- HMRC Basic PAYE ToolsA focused free option for UK PAYE calculations, filings, payslips and year-end records.8.5
See all Symmetry Tax Engine alternatives →
Also Ranked In
Symmetry Tax Engine is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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