Starting a new job is exciting, but that excitement can quickly turn to frustration when your first pay packet is significantly smaller than expected. If this has happened to you, the most likely culprit is an emergency tax code. Every year, thousands of UK employees find themselves temporarily overtaxed because of emergency tax, and while the situation usually resolves itself, understanding how it works and what you can do to speed up the process is essential.
What Is an Emergency Tax Code?
An emergency tax code is a temporary tax code that HMRC instructs your employer to use when they do not have enough information to determine your correct tax position. Rather than risk undertaxing you, HMRC uses a default code that typically only applies the standard Personal Allowance on a non-cumulative basis. This means each pay period is treated in isolation, without taking into account what you have earned or paid in tax earlier in the year.
The most common emergency tax codes you will see on your payslip are 1257L W1, 1257L M1 or 1257L X. The number 1257L represents the standard Personal Allowance of 12,570 pounds, and the suffix indicates that the code is being applied on a week 1 (W1), month 1 (M1) or non-cumulative (X) basis.
Why Does Emergency Tax Happen?
There are several common situations in which you might be placed on an emergency tax code. Understanding the trigger can help you resolve the issue more quickly.
Starting a New Job Without a P45
When you leave a job, your former employer should give you a P45. This document tells your new employer your tax code and how much tax you have already paid in the current tax year. If you do not provide a P45 to your new employer, they will not know your correct tax code and will use an emergency code instead. This is by far the most common reason for emergency tax.
Starting Your First Job
If you are entering the workforce for the first time, you will not have a P45. Your employer should ask you to complete a Starter Checklist (previously known as a P46), which collects information that helps HMRC assign the correct code. If this is not completed, or if HMRC takes time to process it, you may spend your first few weeks on an emergency code.
Returning to Work After a Break
If you have been out of work for a prolonged period, perhaps due to travel, illness, caring responsibilities or a career break, your previous tax records may be out of date. HMRC may not have current information about your circumstances, which can result in an emergency code being applied when you start a new position.
Receiving Benefits or State Pension
If you are receiving certain state benefits or the State Pension alongside employment income, HMRC may need to adjust your tax code to collect the correct amount of tax across all income sources. While these adjustments are being made, an emergency code may be used temporarily.
Changes in Employment Circumstances
Starting a second job, receiving a new company benefit such as a company car, or changes to your pension arrangements can all trigger a review of your tax code. During the review period, HMRC may place you on an emergency code.
How Emergency Tax Affects Your Pay
The impact of emergency tax depends on which code is being used and how it is applied. Under the most common scenario, where 1257L is applied on a non-cumulative basis, you will still receive the standard Personal Allowance but only for that individual pay period. The problem arises because the cumulative system is not being used.
In normal circumstances, HMRC spreads your Personal Allowance evenly across the year. If you are paid monthly, you get one-twelfth of your allowance each month. With the cumulative system, if you were not working earlier in the year, you would get the benefit of the unused allowance from those earlier months. Under an emergency code, you miss out on this catch-up, which means you can end up paying more tax than you should.
In more extreme cases, particularly if your employer has applied the BR code (basic rate) because they have received no information at all, every penny you earn will be taxed at 20% with no Personal Allowance. This can result in a significant hit to your take-home pay.
How to Check If You Are on Emergency Tax
The easiest way to check is to look at your payslip. Your tax code will be printed somewhere on it, usually near the top. If you see W1, M1 or X after your tax code number, you are on an emergency code. You can also check your tax code through your Personal Tax Account on the GOV.UK website, where you can see the code HMRC has assigned to you and the reasons for it.
Another telltale sign is if your take-home pay is noticeably lower than you expected based on your salary. Using our net pay calculator can help you see what your pay should be under the correct code, making it easy to compare.
How to Fix an Emergency Tax Code
The good news is that emergency tax is usually a temporary situation, and there are several things you can do to resolve it quickly.
Step 1: Give Your P45 to Your New Employer
If you have a P45 from your previous employer but have not yet handed it over, do so immediately. Your new employer will use the information on it to apply the correct tax code from your next pay period.
Step 2: Complete a Starter Checklist
If you do not have a P45, ask your employer for a Starter Checklist. This form asks you to provide information about your previous employment and student loan status. Your employer will send this information to HMRC, which should trigger the correct tax code to be issued.
Step 3: Contact HMRC Directly
If you have done both of the above and you are still on an emergency code, or if several weeks have passed without a correction, contact HMRC on 0300 200 3300. You can also use the online chat function through your Personal Tax Account. Have your National Insurance number, employer details and payroll number ready when you call.
Step 4: Use Your Personal Tax Account
Log in to your Personal Tax Account at GOV.UK to check your current tax code and update your employment details. You can report a change in circumstances, add a new employer and even request a tax code change directly through the system. This is often the fastest way to resolve the issue.
Getting Your Money Back
If you have overpaid tax because of an emergency code, the good news is that you will get the money back. Once HMRC issues your correct tax code, your employer will make an automatic adjustment. The cumulative system will recalculate your tax position for the entire tax year, and any overpayment will be refunded through your wages. This means you may see a particularly large net pay in the month the correction is applied.
If the tax year has already ended and you overpaid, HMRC will typically send you a P800 tax calculation showing that you are owed a refund. You can claim this online through your Personal Tax Account, and the money should reach you within five to six weeks. Alternatively, HMRC may adjust your tax code for the following year to spread the refund across future pay packets.
Common Myths About Emergency Tax
There are several misconceptions about emergency tax that are worth clearing up. First, being on an emergency tax code does not mean you are in trouble with HMRC. It is simply an administrative default. Second, you do not need to pay anyone to fix it. There are companies that advertise tax refund services and charge significant fees, but you can do everything they do yourself for free through HMRC's official channels.
Third, emergency tax does not always mean you are overpaying. In some unusual circumstances, an emergency code could result in you underpaying tax, in which case you may face a bill later. This is relatively rare but is another reason to get your code corrected promptly.
How to Avoid Emergency Tax in the Future
Prevention is better than cure. Here are some practical steps to avoid emergency tax when changing jobs:
- Always collect your P45 from your previous employer on or shortly after your leaving date.
- Give your P45 to your new employer on your first day or as soon as possible.
- If you do not have a P45, complete the Starter Checklist without delay.
- Keep your Personal Tax Account up to date with your current employment details.
- Check your payslip as soon as you receive your first payment from a new employer.
Emergency tax is a common inconvenience, but it does not have to be a lasting problem. By understanding what it is and taking quick action, you can ensure your pay returns to normal as soon as possible. If in doubt, HMRC's helpline and online services are free to use and can resolve most issues within a few weeks.