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Calculators by Symmetry (CBS) lets you add accurate, compliant paycheck calculators to your website or application. Using Symmetry’s tax data, CBS calculates federal, state, and local withholding so your users can estimate take-home pay, gross-up amounts, bonuses, retirement contributions, and more. Symmetry maintains the underlying tax data, so results reflect the latest federal, state, and local rules without you maintaining tax logic yourself.

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What you can do with CBS

  • Estimate net (“take-home”) pay from salary or hourly wages
  • Reverse-engineer the gross pay needed to hit a target net (gross-up)
  • Model bonuses using flat or aggregate supplemental methods
  • Show the paycheck impact of 401(k) and 403(b) contributions
  • Calculate final pay, stock option, tuition, and tax tip scenarios
See Available calculators for the full list.

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The two integration paths

CBS offers two integration paths. Use either on its own, or combine them.

Widgets

Symmetry-managed calculators you embed with a single script tag. The fastest way to launch. Configure defaults, theme, and help text inline, by URL, or through the admin console.

API

Send calculator inputs from your own interface and receive results to display, store, or report on. Use it when you need a custom UI or server-side calculations.
Not sure which fits your use case? See Widgets vs. API.

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What CBS is built for

CBS produces paycheck estimates, figures you show someone so they can understand or plan around their pay. It fits a marketing site, an employee self-service portal, an onboarding flow, or an offer-letter tool. It isn’t a payroll system of record. CBS doesn’t run an actual pay run, file, or remit. If you need production withholding at scale, talk to your Symmetry representative about the right product. For how a calculation is put together, see How calculators work.

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Where to go next

Widgets quickstart

Embed your first calculator widget.

Calculation methods by calculator

Understand how each calculator computes withholding.