Tax codes may feel confusing, especially if you’re new to running your own business or managing payroll. Getting them right first time is essential for staying compliant with HMRC, and ensuring employees are paying the correct amount of tax. 

In this blog, we explain the UK tax codes for the 2026/27 tax year, what each of them means, and how to use them correctly in your payroll.

• They make sure the right amount of PAYE is deducted per employee 

• They keep your business compliant with HMRC regulations 

• They help to avoid payroll errors and employee pay issues 

Tax codes let you know how much Income Tax to deduct from an employee’s wages or pension. If you accidentally use the wrong code, it can lead to under / overpayments, and HMRC enquiries.  

Issued by HMRC, a tax code tells employers how much tax-free income (also known as Personal Allowance) an individual is entitled to. 

For the 2026/27 tax, the key points are as follows: 

• Personal Allowance remains at £12,570 

• The tax thresholds are frozen until at least 2031 

• For most employees, their tax code will remain the same year-on-year, unless their circumstances change 

Tax codes can still change, should an employee’s income, benefits, or personal situation changes.  

• 257L – Standard Tax Code  

• BR – Basic Rate (20%) on all income  

• D0 – Higher Rate (40%) on all income  

• D1 – Additional Rate (45%) on all income  

• 0T – No Personal Allowance  

• K Codes – Negative Personal Allowance  

What it means:
Employees are entitled to the full £12,570 Personal Allowance 

Who it’s for:
Most UK employees with one job or income source 

Accounting tip:
Apply PAYE after the allowance is used across the tax year. 

BR – Basic Rate Tax Code 

What it means:
All income is taxed at 20%, with no allowance applied 

Who it’s for:
Commonly used for second jobs or pensions 

• D0: All income taxed at 40%  

• D1: All income taxed at 45% 

Business tip: 
These tax codes override personal allowances and should be applied to the full rate of all earnings. 

What it means:
No tax-free allowance is applied 

Who gets it: 

• Employees with missing details (temporary use)  

• High earners who have lost their Personal Allowance  

• Individuals with multiple income sources  

What it means:
The employee owes tax on benefits or previous underpayments 

Example:
A K500 code means £5,000 is added to taxable pay for PAYE calculations, increasing the tax deducted. 

Business tip:
K codes can be complex, so ensure to always follow HMRC instructions carefully. 

• M – Marriage Allowance received  

• N – Marriage Allowance transferred  

• T – HMRC needs to review the tax calculation  

• S – Scottish taxpayer (different tax bands apply)  

• C – Welsh taxpayer  

These prefixes and suffixes are increasingly common and important for accurate payroll processing. 

Examples: 1257L W1 / M1 / X 

What it means:
Tax is calculated based only on the current pay period (non-cumulative) 

Who gets it: 

• New employees without a P45  

• Employees with incomplete tax history  

Business tip:
Encourage employees to submit their P45 or starter checklist quickly so HMRC can issue the correct code. 

Higher earners are affected by additional tax rules that impact their tax code.

For 2026/27: 

• Personal Allowance reduces by £1 for every £2 earned over £100,000  

• It’s completely removed at £125,140  

• Employees may move from 1257L to 0T  

• PAYE deductions can increase significantly  

• More individuals may fall into higher tax brackets due to frozen thresholds  

If you think a tax code is incorrect: 

• Check via the HMRC Personal Tax Account  

• Contact HMRC directly  

• Wait for a P6 or P9 notice before making payroll changes  

Important:
Employers mustn’t change tax codes manually unless HMRC instructs them to do so.  

• They keep your payroll compliant with HMRC  

• They reduce the risk of errors and corrections  

• They ensure employees are paid accurately  

• They support smooth, efficient payroll operations  

Even if you outsource payroll, it’s important to understand the basics of how tax codes work. 

Understanding UK tax codes isn’t just for accountants, it’s a key part of running an efficient and compliant business. 

From standard codes like 1257L to the more complex K codes and high-earner adjustments, each one directly affects how much tax is deducted through PAYE. 

At Vantage Accounting, our Client Directors help business owners stay compliant, optimise payroll, and navigate tax with confidence. If you have questions about tax codes, get in touch with your Client Director today.  

If you’re not yet a Vantage client, and you’d like support with your payroll or tax codes, get in touch to find out more.  

Take the stress out of payroll and ensure your business stays on track, with Vantage’s better business accounting.