Sources and how figures are kept current

This site is operated by Utility Matrix LLC. Each calculator uses published rates from official authorities, with the source linked on the relevant page.

We record, for each rate, the period it applies to and a date by which we recheck it. When a rate changes or we cannot confirm the current figure, the affected page is set aside until it is reconfirmed, rather than showing a figure we cannot stand behind.

• United States: federal Social Security, Medicare, and FUTA, plus modeled state items where shown.
• Canada: federal Canada Pension Plan (CPP and CPP2) and Employment Insurance for non-Quebec workers.
• Australia: the in-force Superannuation Guarantee, plus New South Wales payroll tax when the supported employer-wide context is supplied. Other state and territory payroll-tax regimes are not substituted with a generic Australian rate.
• New Zealand: KiwiSaver employer contributions and, where you supply it, the ACC Work levy.

Amounts are rounded to the nearest whole currency unit. Some employer-specific lines require your own actual rate. Each current calculator result shows when it was evaluated and the validity boundary after which its sourced figures are withdrawn unless reconfirmed.