Skip to main content
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. CBS keeps its calculations current with the Symmetry Tax Engine, so results reflect the latest federal, state, and local tax rules without you maintaining tax logic yourself.

​
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.

​
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.

​
CBS and the Symmetry Tax Engine

CBS provides ready-to-use paycheck calculators for estimating take-home pay, gross-up, bonuses, and more. It’s powered by the Symmetry Tax Engine (STE), the calculation engine that determines federal, state, and local withholding. You don’t license STE separately to use CBS; the engine is built in. See How calculators work.

​
Where to go next

Widgets quickstart

Embed your first calculator widget.

Calculation methods by calculator

Understand how each calculator computes withholding.