Capital allowances can be crucial to the financial viability of a project. They arise as a result of expenditure on plant and machinery and can be used by taxpayers as a deduction against taxable profits over a period of time. So, on a wind project for example, expenditure on turbines, motors and the like would benefit. There are projects with a high level of debt that may be adversely impacted by the government's proposed changes to the deductibility of interest for tax. EIS is a generous (and complicated) tax regime offering individual investors 30% relief on the total amount invested and a blanket exemption from Capital Gains Tax.