This is the full list of CBS calculators. Most are available on both integration paths (as an embeddable widget and through the API); exceptions are noted.
Calculator types
¹ 457 has no dedicated widget and is not a listed API endpoint. It’s reachable only through the API’s model, print, and state-parameter flows when a 457 calculator type is supplied.
In the API’s /calculators listing, the two bonus calculators are named bonus-percent (flat bonus) and bonus-agregate (aggregate bonus); the widget and URL names are flatbonus and agbonus.
Supplemental bonus methods are state-by-state compliant. Some states do not support the flat bonus (percent) method. For example: AZ, CT, DE, HI, LA, MA, MS, NJ, UT, WY, DC, and PR.
Multi-calculator
In CBS, multi-calculator is a widget-only layout feature, not a calculation type. It places up to four calculators side by side on one page and includes a copy button to reuse inputs across them. It has no API endpoint. See Multi-calculator.
Calculation methods
The withholding method varies by calculator (annualized, flat, or current aggregation). For the per-calculator breakdown, see Calculation methods by calculator. 
