Super-deduction
From ACT Wiki
Tax - tax relief - tax deductions.
In the context of tax, super-deductions are amounts which are given more than usually generous tax relief, in order to increase the incentives for businesses and other taxpayers to make the type of expenditure qualifying for the super-deduction.
Examples of qualifying expenditure have included certain kinds of capital expenditure.
The additional tax relief is given by way of a greater than usual rate of deduction from otherwise taxable profits.