Is 1257L an Emergency Tax Code?

Table of Contents

No, 1257L on its own is not an emergency tax code.

For the 2026/27 tax year, 1257L is the standard PAYE tax code for many employees and pensioners in England and Northern Ireland who receive the full £12,570 Personal Allowance.

However, the answer changes when extra letters or markers appear after the code.

1257L W1, 1257L M1 and 1257L X are emergency tax codes. Some payroll systems may instead display NONCUM, meaning non-cumulative.

This distinction matters because an emergency code calculates Income Tax using only the current week or month rather than properly balancing pay and tax across the tax year.

Anyone confused by the ordinary code can first look at what the standard 1257L tax code means before comparing it with its emergency variants.

What Does the 1257L Tax Code Mean?

The code can be broken into two main parts.

1257 broadly represents a tax-free allowance of £12,570.

L normally means the taxpayer qualifies for the standard Personal Allowance.

A normal cumulative 1257L code allows payroll to consider:

Income received since 6 April
Income Tax already deducted
Personal Allowance accumulated so far
Unused allowance from earlier pay periods
Previous PAYE deductions in the same tax year

This cumulative approach can automatically balance a person’s tax position as the year progresses.

Someone who wants to establish whether their code fits their income and circumstances can also check whether a tax code is correct.

Which Versions of 1257L Are Emergency Tax Codes?

There are three particularly important variants.

1257L W1

W1 means Week 1.

Income Tax is calculated using only that week’s pay. Earlier earnings, earlier tax deductions and unused Personal Allowance are not included in the calculation.

This commonly affects weekly-paid workers. A more detailed explanation of the W1 tax code shows why it can produce a different deduction from a cumulative code.

1257L M1

M1 means Month 1.

Payroll treats every month as though it were the first month of the tax year.

It does not take previous months’ unused allowances or PAYE deductions into account.

The 1257L M1 tax code is particularly common when someone begins a new employment or starts receiving pension income without HMRC having a complete PAYE record.

1257L X

X is also an emergency marker and can be used where pay dates vary.

Like W1 and M1, it prevents the normal cumulative calculation from being used.

Some payroll systems may show NONCUM rather than W1, M1 or X. The underlying principle of non-cumulative tax codes is that each relevant pay period is effectively considered separately.

How Does 1257L Compare With BR, 0T, K and Other Tax Codes?

One of the biggest sources of confusion is assuming that every unusual tax code is an emergency code.

That is not the case.

Code	Typical Meaning	Emergency by Itself?
1257L	Standard Personal Allowance	No
1257L W1	Week 1 calculation	Yes
1257L M1	Month 1 calculation	Yes
1257L X	Emergency/non-cumulative basis	Yes
BR	All income from that source taxed at basic rate	No
BRX	BR treatment with emergency X marker	Yes
0T	No Personal Allowance through that source	No, not by itself
0T W1/M1	No allowance and non-cumulative operation	Yes
D0	All income from that source taxed at higher rate outside Scotland	No
K code	PAYE deductions exceed available allowances	No, not by itself
NT	No Income Tax deducted from that source	No
S1257L	Scottish taxpayer with standard allowance	No
C1257L	Welsh taxpayer with standard allowance	No

A BR tax code should therefore not automatically be described as emergency tax. It is commonly used where the Personal Allowance has already been allocated elsewhere.

If an X marker is added, a BRX tax code is operating on an emergency basis.

Likewise, a K tax code has a separate purpose: it is generally used where taxable amounts HMRC wants to collect through PAYE are greater than the allowances available.

Why Might Someone Be Put on 1257L W1, M1 or X?

Emergency tax normally appears because HMRC or payroll does not yet have enough information to calculate PAYE cumulatively.

Common triggers include:

Starting a new job
Not giving a new employer a P45
Completing a starter checklist incorrectly
HMRC not yet receiving previous employment information
Moving between employers
Returning to work after a period without PAYE income
Beginning to receive pension income
Taking money from a pension for the first time
Starting to receive a taxable company benefit
Starting to receive the State Pension
Changes involving several jobs or pensions
Payroll receiving an updated code on a non-cumulative basis

A missing P45 does not prevent someone from starting work, but providing accurate starter information is important.

Someone who cannot find the document can check what happens when they need a P45 but cannot obtain another copy.

How Much Difference Can 1257L M1 Make to a Payslip?

The financial impact becomes clearer with a worked example.

Assume an employee:

Starts work in September
Had no taxable earnings from April to August
Earns £4,000 in September
Qualifies for the full Personal Allowance
Has no other taxable income
Is an England or Northern Ireland taxpayer

A simplified comparison looks like this:

September Calculation	Cumulative 1257L	1257L M1
September salary	£4,000	£4,000
Allowance potentially available for calculation	Around £6,285 accumulated by month 6	Around £1,048 for that month
Amount taxable in simplified example	£0	Around £2,952
Approximate Income Tax	£0	£590.40

Why is there such a large difference?

Under cumulative 1257L, the employee has not used the Personal Allowance built up during the first five months of the tax year.

Under 1257L M1, payroll cannot look backwards. September is treated independently and only approximately one month’s Personal Allowance is available.

This does not mean everyone on an M1 code will overpay £590.40. The actual effect depends on previous income, previous tax, taxable benefits, income level and the date employment starts.

The example simply shows why an emergency code can make a payslip look unexpectedly heavily taxed.

Why Can Pension Withdrawals Be Hit Particularly Hard by Emergency Tax?

Pension withdrawals are one of the most important situations to understand because the first taxable flexible pension payment is often taxed using an emergency Month 1 basis where the provider does not already hold an appropriate tax code.

This can affect:

Flexi-access drawdown
UFPLS payments
Full pension-pot withdrawals
Some first pension payments
One-off taxable pension withdrawals

The issue is that PAYE may treat a large one-off payment as though a similar amount could be received every month.

That can temporarily push part of the payment into higher or additional-rate bands.

Someone planning flexible access may therefore want to understand how pension withdrawals can trigger emergency tax before deciding how much cash is needed immediately.

Example: £30,000 Taxable Pension Payment

Assume the taxable element of a first flexible pension payment is £30,000 and the provider has to operate 1257L on a Month 1 emergency basis.

A simplified 2026/27 calculation could produce approximately:

Calculation	Approximate Amount
Taxable pension payment	£30,000
Month 1 allowance	£1,048
Taxable after allowance	£28,952
PAYE deducted	About £11,931
Effective tax against £30,000 payment	About 39.8%

That does not necessarily mean the pension saver genuinely owes nearly 40% tax.

If £30,000 were the person’s only taxable income for the entire tax year and the full £12,570 Personal Allowance ultimately applied, a simplified final Income Tax bill would be around £3,486.

The temporary difference could therefore exceed £8,400.

The calculation changes significantly if part of the pension payment is tax-free. For example, an UFPLS will commonly have a tax-free element, so it is essential to distinguish the gross withdrawal from the portion actually subject to PAYE.

Which Pension Tax Refund Form Applies After Emergency Tax?

Someone does not necessarily have to wait until the following tax year to recover pension tax overpaid under an emergency code.

The correct route depends on what happened to the pension pot and whether other income continues.

Situation	Relevant Form
Whole flexible pension pot emptied, stopped working and no continuing employment income	P50Z
Whole flexible pension pot emptied but other taxable income continues	P53Z
Only part of the flexible pension pot withdrawn and no further regular/flexible payments are expected during the tax year	P55
Small pension/trivial commutation rather than pension flexibility	P53 may apply

P50Z

P50Z is generally relevant where someone has flexibly accessed and emptied the pension pot, stopped working and does not expect to return to work, subject to the specific eligibility conditions.

P53Z

P53Z is normally relevant where the entire flexible pension pot has been accessed but the individual has other income.

P55

P55 is generally used when only part of the pension pot has been flexibly accessed, the pot has not been emptied, and the relevant conditions for an in-year refund are met.

This distinction matters when deciding whether to take a large amount immediately or make a smaller initial withdrawal.

Someone with an immediate cash requirement may accept the temporary PAYE deduction and reclaim it. Someone who has more flexibility may instead consider the tax and cash-flow consequences before choosing the withdrawal amount.

That decision concerns when cash becomes available, not just the person’s final annual tax liability.

Are S1257L and C1257L Emergency Tax Codes?

No.

S1257L and C1257L are not emergency codes merely because they have an additional letter at the front.

The prefixes identify which Income Tax regime applies.

Scottish Taxpayers

The S1257L tax code normally indicates that Scottish Income Tax rates apply and that the person receives the standard £12,570 Personal Allowance.

Emergency versions can include:

S1257L W1
S1257L M1
S1257L X

This matters because Scotland has six non-savings/non-dividend Income Tax bands in 2026/27: starter, basic, intermediate, higher, advanced and top rates.

As a result, the emergency-tax calculation on a large payment can differ from the result for an employee elsewhere in the UK.

Welsh Taxpayers

The C1257L tax code identifies someone being treated as a Welsh taxpayer while receiving the standard Personal Allowance.

C1257L itself is not an emergency code.

However:

C1257L W1
C1257L M1
C1257L X

can indicate emergency/non-cumulative operation.

The W1, M1 or X marker is therefore still the crucial part to inspect.

Is BR on a Second Job the Same as Emergency Tax?

No.

This distinction is particularly important for people with several jobs.

Someone only receives one Personal Allowance for the tax year, even when they have several jobs or pensions.

HMRC may therefore allocate the Personal Allowance to the main employment and use BR on another source.

For example:

Employment	Example Code
Main job	1257L
Second job	BR

BR normally means every pound from that source is taxed at the basic rate without another Personal Allowance.

That can be completely legitimate.

It is not the same mechanism as 1257L M1 or W1.

However, BR can still be wrong where, for example:

It appears on the person’s only employment
The Personal Allowance should have been allocated differently
Total income enters a higher tax band
HMRC still shows an old job as active
Employment information is duplicated

A second job should therefore not automatically be assumed to require BR, and BR should not automatically be labelled emergency tax.

How Long Does It Take to Fix an Emergency Tax Code?

The timescale depends on why the code has been applied.

For a new employment, HMRC says it can take up to 35 days from starting the job for the emergency code to be updated once employment information flows through PAYE.

If a person has recently started work, HMRC advises allowing that period for new income details to arrive before contacting them about an apparently incorrect code.

Once HMRC determines that a code needs changing, it normally tells the individual and employer about the updated code within 15 working days.

After the new code is issued:

Pay Frequency	When the New Code Should Normally Appear
Monthly	Next or following payslip
Weekly	By the third payslip

A practical timeline therefore looks like this:

Step 1: Check the first payslip and confirm whether the code shows W1, M1, X or NONCUM.

Step 2: Make sure employment, pension and previous-job information is correct.

Step 3: Give payroll a P45 where available or ensure the starter checklist was completed accurately.

Step 4: Allow HMRC time to receive the new employment information.

Step 5: If the code remains wrong after the relevant period, update the PAYE information.

Step 6: HMRC can issue a revised code to the employer or pension provider.

Step 7: Check the next relevant payslips to make sure it has actually been applied.

Where an update is required, information on how to change a tax code online can help explain the process.

What Happens If an Employer Uses the Wrong Tax Code?

Employer Uses the Wrong Tax code

There is an important difference between:

HMRC issuing a code that later proves inappropriate; and
An employer failing to operate the code or PAYE instructions correctly.

Employers are responsible for operating PAYE properly and must normally use the tax code HMRC instructs them to use.

For example, an employer should not simply replace BR with 1257L because an employee says the latter looks more familiar.

If an employer fails to deduct the correct PAYE because of an employer error, the starting position under PAYE rules is that the employer is liable for the under-deduction.

HMRC may pursue the employer where the shortfall arose from issues such as:

Using the wrong tax code
Failing to follow starter or P45 procedures
Using PAYE tables incorrectly
Ignoring an HMRC coding instruction
Failing to deduct tax where required

There are circumstances in which HMRC can issue a direction transferring liability for an under-deduction to an employee, so employer liability is not absolute in every case.

For business owners, payroll teams and employees alike, it is therefore important to distinguish an incorrect HMRC code from an employer failing to operate the issued code correctly.

How Can Someone Get Off an Emergency Tax Code?

The solution depends on the cause.

Check the Exact Code

Do not simply look for “1257L”.

Check whether the payslip actually says:

1257L
1257L W1
1257L M1
1257L X
NONCUM
Another code entirely

Check HMRC’s Employment Records

Make sure:

Old employments have ended
The new job is recorded correctly
Estimated income is sensible
Pension income is correct
Company benefits are accurate
Multiple jobs are correctly allocated

Give the Employer the Correct Starter Information

Where a P45 is available, it should normally be supplied.

Without one, the starter checklist should be completed accurately.

Check the Employer Has Received the New Code

Sometimes HMRC has already corrected a person’s record, but payroll has not yet used the update.

If HMRC shows the new code but the payslip still shows the old one, payroll should be asked whether the latest coding notice has been received and processed.

Do Not Ask Payroll to Invent a New Code

Employers cannot generally change someone’s HMRC tax code simply because another code appears more appropriate.

They must follow PAYE rules and coding instructions.

Will Emergency Tax Be Refunded Automatically?

It can be.

If HMRC has sufficient income information and changes an emergency code to the appropriate cumulative code, PAYE can often calculate how much tax has been overpaid.

The employer or pension provider may then refund the difference through a later payment.

This can appear as:

A smaller PAYE deduction
No Income Tax deduction for that period
A negative tax figure
A larger-than-usual net payment

However, an automatic in-year refund is not guaranteed in every situation.

If the tax year ends before the position is corrected, HMRC may reconcile the person’s tax record afterwards.

Anyone who believes too much tax has been deducted can investigate whether they are owed an HMRC tax rebate.

What Should Someone Remember About the 1257L Emergency Tax Code?

The key distinction is simple: 1257L itself is not normally an emergency tax code.

For 2026/27, it remains the standard code for many people receiving the full £12,570 Personal Allowance.

It becomes an emergency code when it is operated with markers such as:

W1, M1, X or NONCUM.

These markers tell payroll not to use the normal cumulative PAYE calculation.

That can matter considerably for someone who starts work partway through the tax year, has unused Personal Allowance or makes a large first pension withdrawal.

It is also important not to confuse emergency tax with other codes such as BR, 0T or K. Each performs a different job within PAYE.

A temporary emergency code is not automatically an error, but it should be investigated when it remains in place after HMRC and payroll have received all the information needed to calculate the correct tax.

Frequently Asked Questions

Is 1257L X an emergency tax code?

Yes. The X marker means the code is being operated on an emergency or non-cumulative basis. Ordinary 1257L without X is not normally an emergency code.

Is 1257L M1 an emergency tax code?

Yes. M1 means Month 1, so each month’s Income Tax is calculated separately without taking account of earlier pay and tax in the tax year.

Is 1257L W1 an emergency tax code?

Yes. W1 means Week 1 and calculates PAYE using only the current week’s pay rather than the cumulative tax-year position.

Is 1257L M1 the same as being taxed at 45%?

No. M1 is a method of calculating PAYE, not a 45% tax rate. However, a large one-off payment can cause part of the income to fall into higher or additional-rate bands under the Month 1 calculation.

Will emergency tax automatically be refunded?

It may be refunded through payroll once HMRC issues an appropriate cumulative code and has enough income information. In other circumstances, a claim or later HMRC reconciliation may be required.

Can someone stay on an emergency tax code all year?

It is possible in some circumstances. For example, HMRC says certain emergency codes connected with company benefits or State Pension changes can remain until the tax year ends. A code that appears unexpectedly should still be checked.

Is BR an emergency tax code?

BR by itself is not normally an emergency tax code. It taxes all income from that source at the basic rate without applying a Personal Allowance.

Is 0T an emergency tax code?

0T by itself is not one of the standard emergency markers. However, 0T can be operated on a Week 1 or Month 1 non-cumulative basis in certain circumstances.

Can Scottish taxpayers receive emergency tax codes?

Yes. A Scottish code can include emergency markers, such as S1257L W1 or S1257L M1. Scottish Income Tax rates are then relevant to the PAYE calculation.

Can Welsh taxpayers receive 1257L M1?

Welsh taxpayers would normally have a C prefix where Welsh taxpayer status applies, so an emergency version could appear as C1257L M1.