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What is Tax Code 1257L?

Updated: Oct 14, 2023

Tax Code 1257L is a common tax code in the UK, used by many individuals with a single source of employment or pension. It represents the threshold before which income remains untaxed, aiding both employers and employees in understanding their tax obligations. This part of the article will shed light on what Tax Code 1257L signifies, its components, and its relevance to taxpayers in the UK.


What is Tax Code 1257L


If you work full-time, part-time, or receive a private pension, you should have received a letter from HMRC earlier this year (usually February / March) with an updated tax number showing your tax number for the new fiscal year (the new fiscal code year begins April 6, 2023). The 1257L number is the most common tax identification number in the UK and Northern Ireland for the 2023/24 tax year starting 6 April 2023. It is expected not to change until 2026. Almost everyone in the UK has the right to tax-free staff registration profit, which means you receive a certain amount of your tax-free income each year.


Typically, you will receive a new social security number at the beginning of the fiscal year, when changes to your personal benefits take effect. If your tax number is 1257L, this means your tax credit is £ 12,570 for the fiscal year 2023/24. This is an increase of £ 70 over fiscal 2022-23.


1257L replaces the old 1250L tax number, which was the most common tax number for the past two tax years. The applicable tax numbers are C1270L in Wales and S1270L in Scotland. Your social security number is important because it is used to calculate the amount of tax you will pay.


What is Tax Code 1257L?

What Does Tax Code 1257L Signify?

Tax Code 1257L is essentially a mechanism employed by the UK tax system to signify the amount of income an individual can earn before being subjected to Income Tax. The "1257" in the code denotes the tax-free personal allowance, which, as of the current regulations, stands at £12,570. The "L" character at the end indicates that the individual is entitled to the standard tax-free personal allowance​.


What Exactly Does Tax Number 1257L Stand For?

Personal allowances are what UK taxpayers can get tax-free. For the 2023/24 fiscal year, the personal allowance has been increased to £ 12,570. HMRC has sent a personal check for £ 12,570 to tax identification number 1257L. The exception is the last resulting number 1257. The letter L is added if you are entitled to regular personal leave. This results in tax number 1257L. In other words:


Numeric Value (1257): The numeric portion of Tax Code 1257L, which is 1257, represents the tax-free personal allowance an individual is entitled to in a given tax year. This value reflects the amount of income one can earn without incurring any tax liability. It's a crucial figure for both employers and employees as it helps in determining the amount of tax that should be withheld from earnings.

Letter Suffix (L): The letter "L" in Tax Code 1257L signifies that the taxpayer is entitled to the standard tax-free personal allowance. This standard allowance is a feature of the UK tax system aimed at ensuring a level of income remains untaxed, promoting financial stability among taxpayers.


So with tax identification number 1257L, you can earn £ 12,570 before tax.


What Does the Tax Code Mean?

The UK Tax ID is a numeric number followed by a letter that HMRC will send to your employer to inform you of the amount of income tax withheld by your PAYE. HMRC must remove it because it has all the information about your personal income and the deductions they have to make from you, which means you can keep your employer confidential.


Your social security number is valid for one fiscal year, so you and your employer may receive an encryption warning before the new fiscal year begins. You and your employer can also receive a letter from HMRC to change your social security number if your status changes, for example, if:


  • You are applying for a taxable marriage allowance.

  • You have to pay a high-income tax of £ 50,000.

  • You are self-employed and want to pay all taxes with your PAYE tax number.


How Do I Find Out My Tax Code?

There are several ways to verify your TIN for the current fiscal year, which begins on April 6, 2023, and ends on April 5, 2024. Your social security number will appear on your paycheck, usually along with your social security number.


Your company must provide you with a payment receipt. So, if you don’t know how to get in, ask your employer for advice. You can also use the online government tax review tool to view your tax numbers.



What Is Tax Code 1257 For?

Almost everyone in the UK is entitled to tax-deductible personal benefits which means they receive a certain amount of their tax-free income each year. HMRC changed the personal check to £ 12,570 and made it a tax number 1257L. They subtract the last digit given by 1257. Then add the letter L if you are eligible for the standard personal allowance. This results in the tax code 1257L.


Simply put, if you have a tax number 1257L, it means you can earn £ 12,570 before tax. How many taxes do you have to pay with the tax code 1257L? The tax code 1257L is a cumulative code. This means that you will receive a portion of your personal allowance every time you pay.


For example, if you pay monthly, you will receive £ 1047.50 (£ 12,570) tax-free every month you are paid. This way, at the end of the fiscal year, you will receive your entire personal benefit.


  • Previous income is taxed at 20%. This is for income between £ 12,571 and £ 50,270.

  • It subsequently rises to 40% of revenue between £ 50,271 and £ 150,000.

  • Income over £ 150,001 is taxed at a rate higher than 45%.


If you have worked for several months and have not done any other work during the fiscal year, you will receive all the personal benefits you are entitled to from your first salary if you start a new job. The employer will know which code to use when granting him a P45.


Please note that Scotland has introduced its own tax rates which differ from the above.


What Are the Emergency Tax Codes 1257 W1, 1257 M1, 1257 X?

If you have a tax number 1257W1, 1257M1, or 1257X, you are listed in the emergency tax number. This usually happens if you:


  • Start a new job and don't give the P45

  • Start working with your employer after leaving a free launch

  • Get business benefits, like company cars

  • Get a state pension


If your code is attached to W1 or M1, it is a non-cumulative tax code. The tax payable on each payment is determined regardless of the tax paid this year or the number of tax-free personal checks used. That is, it can lead to overpayments of taxes.


Although an emergency social security number is temporary because the necessary information is collected, this means that you will pay taxes on all of your income in addition to your personal benefit and will not receive any late payment of the personal benefit that you may be entitled to but not right.


If you close the tax year with a contingent tax number, HMRC will fill in the full amount of tax you paid and decide if you owe anything at the end of the tax year. They will then send you an HMRC tax identification notification letter called P800 detailing what you owe and how you will be compensated. If you are registered as a self-employed person, the money you owe will be credited to your tax account.


I Have a Tax Number 1257 For. Is My Social Security Number Incorrect?

Most employees have a correct 1257L tax identification number. A person with only one job and no tax-free benefits or allowance usually have the correct social security number. However, the tax code system can fail quickly. Common examples include:


• Change jobs, have more than one job, start, leave or retire during the year

• You have more than one source of income, such as a job and a pension.

• Changes to tax-free benefits, such as paying a professional fee.

• Changes in taxable profits, such as the supply of company trucks for private use.



How Do I Find Out My Tax Code?

Relevance to Taxpayers

Tax Code 1257L is more than just a random assortment of numbers and letters; it's a critical piece of information that impacts how much tax an individual will pay. For taxpayers, understanding this tax code and its implications is vital as it directly affects their take-home pay. Moreover, it serves as a guideline for employers on how much tax to withhold from an employee's paycheck.


The tax code is particularly relevant to those with a single job or pension, as it simplifies the tax computation process for both the taxpayer and their employer. It ensures that individuals are taxed accurately based on their income levels, promoting fairness and transparency in the UK tax system.


Furthermore, Tax Code 1257L is cumulative, which means if an individual returns to work after a break or begins employment part-way through the tax year, the tax-free personal allowance would have been accumulating, potentially resulting in lower tax deductions for a while​.


How Can I Correct My Tax Code?

When you become aware of an error with your PAYE Social Security number, you must contact HMRC by email or phone (0300 200 3300).

You must provide all necessary and accurate information so that they can properly process your Social Security number.


Please gather all these details before contacting HMRC:


  1. Full name (including middle name)

  2. Date of birth

  3. Email address

  4. National insurance number

  5. Retirement / employer tax reference number

  6. Employee or freshman (private and/or company)

  7. Total estimated revenue for the current fiscal year

  8. Work allowance (for example, Medicare, car fuel allowance)

  9. Any other income (e.g. savings interest, rental property)

  10. Weekly payments of state or state pension



Why Is It Important to Correct the Tax Code?

If your Social Security number is wrong, you are paying the wrong amount of tax. If you overpay, you can request a refund of the overpayment, as long as it is within the HMRC deadline.


Application for a Tax Refund

Claim My Tax Back Limited is a leading financial adviser who helps thousands of UK recruitment professionals and married couples apply for their various tax refunds (mileage allowance, equal tax credit, marriage tax credit) to HMRC. We provide quality service with no hidden costs.


If you need help with a tax refund from HMRC UK please contact our friendly professional staff.


Determining Tax Code 1257L and Its Impact

In this section, we will delve deeper into how Tax Code 1257L is determined by the HMRC, its impact on different types of income, and how individuals can check and update their tax codes to reflect their current financial circumstances.


Determining Tax Code 1257L

The process of determining Tax Code 1257L is straightforward and is closely tied to the personal allowance, which is the amount a UK taxpayer can earn tax-free in a given tax year. The code 1257L is derived by dropping the last digit from the personal allowance of £12,570 and appending the letter 'L,' indicating eligibility for the standard personal allowance. Thus, a tax code of 1257L signifies that an individual can earn up to £12,570 tax-free during the tax year.


Impact on Different Types of Income

Employment Income: Tax Code 1257L primarily impacts employment income by determining the threshold before which no income tax is payable. It signals to employers the personal allowance, ensuring accurate tax deductions from employee paychecks​.


Employer's Responsibility: Employers must ensure they have the correct tax code for each employee to deduct the right amount of tax from their pay. Employers should update payroll records as soon as an employee's tax code changes due to adjustments in personal allowance or other taxable benefits​​.


Tax Rates Beyond the Personal Allowance

Upon exceeding the £12,570 threshold, income tax is levied at progressive rates. The tax rate is 20% for earnings between £12,571 and £50,270, 40% for earnings between £50,271 and £150,000, and 45% for earnings over £150,001​.


1257L Tax Acknowledgment - How Do You Verify That Your Tax Code Is Correct


1257L Tax Acknowledgment - How Do You Verify That Your Tax Code Is Correct?



Replaces tax number 1250L, which was the most common tax number in the last two tax years (2019/20 and 2020/21). Most taxpayers receive an updated tax code notice from HMRC in February or March of each year. Your social security number is important as it is used to calculate the amount of tax you will pay.



How Much Tax Do You Pay with Tax Identification Number 1257L?

With tax number 1257L, the total tax exemption is £ 12,570 per year. This is spread over the year, so, for example, her maternity allowance is £ 241. The monthly fee is £ 1,047.

Any additional income is taxed at 20%. This applies to withdrawals between £ 12,571 and £ 50,270.

  1. It then rose to 40% on earnings between £ 50,271 and £ 150,000.

  2. Income over £ 150,001 will be taxed at a higher rate of 45%.

  3. Note: Scotland has its own tax rates that are slightly different from those listed above.


Is My Tax Identification Number Wrong?

Tax identification number 1257L is correct for most workers. If you only have tax-deductible benefits or benefits, you usually have the correct tax identification number. However, the control coding system can quickly fail. Some common examples are:


• Job change, more than one job, start, end, or retirement per year

• Have more than one source of income, for example, b- job and retirement

• Changes in tax deductions, for example, b- payment of professional donations

• Changes in taxable services, for example, b- Supply of company vehicles for personal use


Circumstances Leading to Changes in Tax Code 1257L

Exceeding Personal Allowance: If an individual's income exceeds the tax-free personal allowance, a change from Tax Code 1257L to BR could occur. This adjustment reflects the assessment by HMRC based on the individual's income.

Additional Income Sources: Engaging in additional employment or receiving income from an extra pension can prompt a change in tax code. Each additional source of income may have its own corresponding tax code.

Annual Adjustments: Every year on April 6th, tax codes are updated to reflect any adjustments in personal allowances. If there are changes in the personal allowances, it would lead to a corresponding change in the tax code.

Employment Changes: Changing jobs, having more than one job, or transitioning phases such as starting, leaving, or retiring within the tax year can affect the tax code. It's crucial to ensure the tax code accurately reflects the current employment status​.


Correcting a Wrong Tax Code

If you find that your tax code is incorrect, it's essential to take steps to correct it to avoid over or underpayment of tax:


Updating HMRC: Make sure HMRC has the latest details about your income. You can use the online service to update your employment details and report any changes in income that may have affected your tax code​​.

Checking Emergency Tax Codes: If you are on an emergency tax code, check what steps you need to follow to update your tax code.


Implications of an Incorrect Tax Code

Having an incorrect tax code can lead to over or underpayment of tax, which can cause financial strain:


Overpayment: Overpaying tax can be claimed back, but it requires providing all necessary information to HMRC to correct the tax code and calculate the refund​.

Underpayment: Underpayment could lead to a debt owed to HMRC, which might be collected through adjustments in your tax code in the following year or other means.


How Do I Correct My Tax Identification Number?

If you think your tax number is incorrect, please call HMRC on 0300 200 3300. Calling HMRC immediately will reduce tax errors, so don't hesitate. For more ways to contact HMRC about the incorrect social security number: Contact HMRC.

Checking and Updating Your Tax Code


Checking Your Tax Code: Individuals can check their tax code on their payslips, P45, or P60 forms. Employers can also access HMRC tax code notices or check their payroll software if it has this feature to verify an employee's tax code.

Updating Your Tax Code: If there are changes to your tax code, HMRC should be notified, and employers should update their payroll records to reflect the new tax code. This includes changes in personal allowance or the start or stop of receiving taxable benefits​.


Multiple Tax Codes

Employees with multiple sources of income or taxable benefits from different sources may have more than one tax code. Employers need to ensure the correct tax code is used for each job to avoid over or underpayment of tax​.


Adjustments and Corrections to Tax Code 1257L

Tax Code 1257L represents the tax-free personal allowance for many individuals in the UK. However, several factors can lead to changes in this tax code. This segment will explore the circumstances under which Tax Code 1257L may change, the steps to correct a wrong tax code, and the implications of having an incorrect tax code.


The tax code is a vital aspect of the UK tax system that directly impacts the amount of tax an individual pays. Understanding the circumstances under which Tax Code 1257L may change and the steps to correct an incorrect tax code is crucial for both individuals and employers. In the next segment, we will explore the frequently asked questions regarding Tax Code 1257L and provide clear, concise answers to help individuals and employers navigate the UK tax system efficiently.


Frequently Asked Questions Regarding Tax Code 1257L

In this section, we aim to address some of the common queries related to Tax Code 1257L, providing a better understanding to individuals and employers navigating the UK tax system.


Q1: How is Tax Code 1257L Calculated?

A: The calculation of Tax Code 1257L is straightforward. It represents the personal allowance, which is the amount you can earn without paying tax. The code is derived by dropping the last digit from the personal allowance amount (£12,570 becomes 1257) and appending the letter 'L,' which signifies eligibility for the standard personal allowance.


Q2: What do I do if my Tax Code is Wrong?

A: If you believe your tax code is incorrect, you should:


  1. Ensure HMRC has updated details about your income.

  2. Use the online service to update your employment details and report any changes in income.

  3. If you're on an emergency tax code, follow the steps outlined by HMRC to update your tax code.

  4. Contact HMRC if you need further assistance or if your tax code remains incorrect after your attempts to update it​​.


Q3: Can Tax Code 1257L Change During the Tax Year?

A: Yes, Tax Code 1257L can change during the tax year due to several reasons including changes in income, additional employment, or adjustments to personal allowance among others​.


Q4: What Happens if I Have Multiple Sources of Income?

A: If you have multiple sources of income, you may have more than one tax code. It's essential to ensure the correct tax code is used for each source of income to avoid under or overpayment of tax.


Q5: What is the Significance of the Letter 'L' in Tax Code 1257L?

A: The letter 'L' in Tax Code 1257L indicates that the individual is entitled to the standard tax-free personal allowance.


Q6: How Do Employers Know Which Tax Code to Use?

A: Employers can obtain the correct tax code from the HMRC or from the employee's P45, P60, or payslips. It's crucial for employers to use the correct tax code to ensure accurate tax deductions from employee paychecks​.


Q7: What Should I do if My Tax Code Changes?

A: If your tax code changes:


Ensure your employer has the updated tax code to make accurate tax deductions.

Check your payslip to confirm the new tax code and any adjustments to your pay.

If you think the new tax code is incorrect, follow the steps to correct your tax code as mentioned earlier.


Q8: How Can I Check My Tax Code?

A: You can check your tax code on your payslip, P45, or P60 documents. Alternatively, you can use the online service provided by HMRC or contact HMRC directly for this information​.


Q9: What is the BR Tax Code and How is it Related to Tax Code 1257L?

A: The BR tax code in the UK signifies that all the income under this code is taxed at the basic rate, which is currently 20%. It is usually issued when HMRC does not have enough information to provide a cumulative tax code like 1257L. If an individual's income exceeds the tax-free personal allowance denoted by Tax Code 1257L, a change to BR could occur, indicating that all income will now be taxed at the basic rate.


Q10: How Does Tax Code 1257L Affect My Take-Home Pay?

A: Tax Code 1257L determines the threshold up to which you don't have to pay any tax, which is £12,570 for the year. The amount of tax you pay on income over this threshold impacts your take-home pay. The correct tax code ensures you're taxed accurately, so a tax code like 1257L maximizes your take-home pay by accounting for the personal allowance.


Q11: If I Have More Than One Job, How Does Tax Code 1257L Apply?

A: If you have more than one job, each job will have its own tax code. Tax Code 1257L might apply to the job with the highest income, while other jobs might have different tax codes. It's essential to ensure that HMRC has accurate information about your income from all sources to assign the correct tax codes and ensure accurate tax deductions across all your employments.


Q12: What Should I Do If I'm On An Emergency Tax Code?

A: If you're on an emergency tax code, it's essential to update your details with HMRC to get on the correct tax code. You can do this by ensuring HMRC has up-to-date information about your income and employment details. Once your correct tax code is determined, any overpaid tax will be refunded, or underpaid tax will be collected by HMRC through adjustments in your tax code or other methods.




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