tax codenoun [ C ]
ukusTAX in the UK, a set of numbers and letters used by the tax authority to show the amount of income tax that someone should pay, depending on their income and personal situation:
The higher the figures in your tax code, the more tax-free income you have.
GOVERNMENT, TAX in the US, the rules of the tax system:
The President made the reform of America's complex tax code a major priority.