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Emergency Tax Calculator UK

Enter your values below to get the result first, then scroll for the full explanation and guidance.

Step 1 • Add values

Use the calculator

Enter your values below to generate an instant result. You can update the inputs at any time to compare different scenarios.

Example: GBP 3,000 taxable monthly pay with 1257L M1 gives approximately GBP 390.40 Income Tax for that month.

Results refresh instantly as values change.

Estimated monthly emergency PAYE Income Tax

£390.401257L M1 non-cumulative estimate, 2026/27

Estimated monthly emergency PAYE Income Tax: £390.40 (1257L M1 non-cumulative estimate, 2026/27)

Only this pay period is used. The emergency code does not account for pay or tax from earlier periods.

Current-period withholding

Only this pay period is used. The emergency code does not account for pay or tax from earlier periods.

Result snapshot

A quick visual read of the values behind this result.

Taxable pay this period£3,000.00
Free pay this period£1,048.00
Pay above free pay£1,952.00
Estimated pay after Income Tax£2,609.60

Recommended next checks

  • →Check your payslip and HMRC tax code. A later cumulative code can adjust deductions; this is not your final annual tax liability.
Taxable pay this period
£3,000.00
Free pay this period
£1,048.00
Pay above free pay
£1,952.00
Estimated pay after Income Tax
£2,609.60

Illustrative 2026/27 Income Tax only for standard 1257L W1/M1 and S/C equivalents. Uses published weekly/monthly free-pay thresholds and proportional tax bands; HMRC payroll table rounding can differ. Excludes National Insurance, pensions, student loans and non-standard codes.

Try different values to compare results.

Enter taxable pay for one pay period and select the W1 or M1 emergency tax code printed on your payslip. The estimate shows temporary Income Tax withholding for that period, not your eventual annual liability.

Restricted scope stated

Applicable period shown

Excluded claim or payroll factors disclosed

Table of Contents

5

About Emergency Tax Calculator UK

Emergency Tax Calculator UK helps you work through the main numbers for this topic quickly with a simple input flow and an instant result.

Use the calculator result as a practical starting point, then review the explanation and assumptions on the page if you want more context.

How emergency W1 and M1 tax works

A non-cumulative emergency code considers only the current week's or month's pay. In 2026/27 the published standard free-pay threshold is GBP 242 per week or GBP 1,048 per month. Income above that threshold is taxed using the relevant period's rate bands, including Scottish bands where the code starts with S. A later tax-code change may adjust deductions.

Formula explained

Emergency W1/M1 PAYE Income Tax estimate

Estimate 2026/27 Income Tax withheld from one weekly or monthly pay period under a standard emergency W1 or M1 tax code. This is not final annual tax.

Formula

Current-period taxable pay = max(0, pay - published weekly/monthly free pay); estimated Income Tax = tax at period rate bands

How the result is built

1Choose the standard W1 or M1 emergency code shown on the payslip.
2Deduct the published free-pay threshold for that period.
3Apply the appropriate UK or Scottish period bands; do not interpret this as final annual liability.

Example

Example: GBP 3,000 taxable monthly pay with 1257L M1 gives approximately GBP 390.40 Income Tax for that month.

Assumptions

  • 2026/27 tax year, standard 1257L emergency W1/M1 code or S/C equivalent only.
  • Enter taxable pay for the selected single week or month, not annual salary or net pay.
  • This estimates period PAYE Income Tax using published free-pay thresholds and proportional bands; HMRC payroll rounding and later cumulative adjustments may differ.
  • National Insurance, pension deductions and student loans are excluded.

Source basis

  • HMRC: 2026/27 employer rates and thresholds; emergency tax codes

Trust and notes

Assumptions and important notes

This calculator is designed to give a fast estimate using the method shown on the page. Results are most useful when your inputs are accurate and the tool matches your situation.

Use the result as guidance rather than a final diagnosis or professional decision. If the result could affect health, legal, financial, or compliance decisions, verify it with a qualified source where appropriate.

  • 2026/27 tax year, standard 1257L emergency W1/M1 code or S/C equivalent only.
  • Enter taxable pay for the selected single week or month, not annual salary or net pay.
  • This estimates period PAYE Income Tax using published free-pay thresholds and proportional bands; HMRC payroll rounding and later cumulative adjustments may differ.
  • National Insurance, pension deductions and student loans are excluded.

Method

Emergency W1/M1 PAYE Income Tax estimate

Last reviewed

October 13, 2026