By agreeing to swap cash salary for a benefit before tax is calculated, what key element is effectively reduced for tax purposes?

Answer

The taxable income base.

Swapping a portion of salary for a benefit before tax is calculated effectively reduces the base amount upon which Income Tax and National Insurance Contributions are calculated.

By agreeing to swap cash salary for a benefit before tax is calculated, what key element is effectively reduced for tax purposes?
employmentcompensationtaxbenefitsalary sacrifice