Русско-англо-русский юридический словарь

Taxable income refers to the base upon which an income tax system imposes tax. Generally, it includes some or all items of income and is reduced by expenses and other deductions. (Wikipedia)

DEFINITION of 'Taxable Income'. The amount of income that is used to calculate an individual's or a company's income tax due. Taxable income is generally described as gross income or adjusted gross income minus any deductions, exemptions or other adjustments that are allowable in that tax year. (Investopedia)

The basic principle for individuals is that if you put £1 into a pension fund then £1 is knocked off your taxable income, saving you the tax on it in the process. (BBC News)

tax base

1. Measure upon which the assessment or determination of tax liability is based. For example, taxable income is the tax base for income tax and assessed value is the tax base for property taxes.

2. Total of taxable assets, income, and assessed value of property within the tax jurisdiction of a government. (BusinessDictionary)