Definition
An alphanumeric code used by employers and pension providers to calculate the correct amount of income tax to deduct from an employee's pay. The numbers in the code represent the tax-free allowance, and the letters indicate the employee's circumstances.
UK Context
HMRC issues tax codes based on an individual's personal allowance, adjustments for benefits in kind, underpaid tax from previous years, and other factors. The standard tax code for 2025/26 is 1257L, reflecting the personal allowance of 12,570 pounds. Employers must apply HMRC-issued codes without amendment.
Best Practices
- Apply new tax codes from HMRC immediately upon receipt via the P9 or coding notice
- Direct employees to contact HMRC if they believe their tax code is incorrect
- Review emergency tax codes and follow up to ensure HMRC provides the correct code
Frequently Asked Questions
What does the letter in a tax code mean?
L means the employee is entitled to the standard personal allowance. BR means all income is taxed at the basic rate. D0 means all income is taxed at the higher rate. K means the employee has deductions that exceed their personal allowance. Other letters indicate Scottish or Welsh tax rates.
What is an emergency tax code?
An emergency tax code is a temporary code applied when HMRC has not yet confirmed the employee's correct code. It applies the standard personal allowance on a non-cumulative (week 1 or month 1) basis, which may result in over- or under-deduction of tax.