Tax Codes Explained: What Does The T Mean On My Tax Code?

You know those little letters and numbers on your payslip next to 'tax code'? Ever wonder what they mean?

Arjun Kumar
Arjun Kumar
Jan 25, 2024

If you're like most people, tax codes seem utterly confusing, and you just accept whatever your employer has listed. However, understanding your tax code can help ensure you're paying the right amount and avoid issues down the road.

Ready to decode your tax code and understand your payslip better? Let's dive in.

What is a Tax Code?

A tax code is a code issued to you by HMRC that tells your employer or pension provider the correct amount of tax to deduct from your income. The tax code is made up of numbers and letters, like 1250L, BR, or NT.

If your tax code is '1257L', that means you are entitled to the standard tax-free Personal Allowance of £12,570 for the 2023/24 tax year. The letters in the code refer to any tax reliefs or adjustments in your specific situation. For example:

L means you get the basic personal allowance.

NT means you're not paying any tax on this income.

What Does the T Mean on My Tax Code?

T denotes that allowances are divided across two or more sources of income, and the code will be reviewed annually by HMRC. If you notice a 'T' at the end of a tax code, it simply means HMRC need more information from you before they can determine your correct tax code.

To resolve an emergency tax code, you'll need to contact HMRC and provide the details they've requested. This is typically done by:

  1. Logging in to your Personal Tax Account. Here, you can securely message HMRC with the information needed.

  2. Calling the Self Assessment helpline at 0300 200 3310 and speaking to an advisor. They can update your records over the phone and issue a new tax code.

  3. Filling out any forms HMRC has sent you regarding your tax situation and returning them promptly.

The sooner you provide HMRC with the details they need, the quicker you'll receive an accurate tax code and ensure the right amount of tax is being deducted from your pay.

How to Check Your Tax Code Online

To check your tax code online, there are a few options available. The easiest is to log into your online tax account with HM Revenue and Customs (HMRC).

Log into your HMRC account:

  1. Go to and log in with your Government Gateway ID.
  2. Once logged in, select 'View your tax code' under the 'Tax' section.
  3. Your tax code will be listed, along with an explanation of what it means.

Understanding Self-Assessment Tax Returns

If you're self-employed or have additional income outside of your regular job, you'll likely need to file a self-assessment online. This requires you to calculate how much tax you owe on your income and any profits from your business.

You'll pay tax through self-assessment on things like:

  1. Profits from your own company or partnership
  2. Rent from the property you own
  3. Interest on savings over £1,000
  4. Income from freelancing or contracting work

The deadline is January 31st each year to avoid potential penalties. If your situation is complex, consider using our online tax software called Taxd to help you file an accurate return. We can help take the confusion and stress out of filing your taxes.


Tax codes can be complicated, but now you've got the basics down. It's a good idea to double-check your tax code to make sure it's correct. If something still doesn't seem right, you can contact us at Taxd for professional assistance on taxes in the UK.

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