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Symmetry Payroll Forms (SPF) automates the employee withholding form process at the federal, state, and local level. Using an employee’s home and work locations, SPF determines which forms are required, guides the employee through completing them, and returns the completed PDF and tax parameters to your system. SPF supports over 130 online withholding forms for the US and Canada, including all resident, nonresident, military spouse, and Canadian TD1 forms. The full list of supported forms and tax parameter outputs is available in the SPF Catalog, updated with each release.

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How SPF is delivered

SPF is available in three implementation types. Each delivers the same compliant forms — the difference is in how much control you have over deployment, UI, and infrastructure.

API

Call SPF’s endpoints from your own employee-facing UI to handle form determination, question flows, and PDF generation. Best for teams who want full control over the user experience and branding.

Hosted

Symmetry hosts and maintains the UI for you — embed it in your application or link out to it directly. Launch without building a forms UI yourself. Best for teams who want to get up and running quickly with minimal front-end build work.

On-Premise

Run the same hosted UI on your own servers. Symmetry delivers compliant form updates for you to roll out on your own schedule. Best for teams that need forms processing to stay inside their own infrastructure.

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Where to go next

API Quickstart

Get up and running with the SPF API.

Hosted Quickstart

Embed SPF using the Hosted solution.

On-Premise Quickstart

Install and configure SPF On-Premise.

Release Notes

See what changed in the latest release.

SPF Catalog & Schema

Browse supported forms, their tax parameter outputs, and the SPF schema.