Notice Period Calculator

Last updated: April 2026

Employment details

Employment start dateNotice given dateLength of service: 8 years 5 months

Who is giving notice?

Contract and pay

My employment contract specifies a notice period

Contractual notice periodUnit

Pay input

Weekly gross pay

Your notice period

13 weeks

Ending: 20 September 2026

Notice breakdown

Statutory notice: 8 weeks
Contractual notice: 13 weeks
Effective notice: 13 weeks

Your contractual notice period is longer than your statutory entitlement. Your contract applies.

Payment in lieu of notice

Notice weeks: 13
Weekly pay: £500
PILON gross: £6,500
Estimated tax at 20%: -£1,300
Estimated net PILON: £5,200

PILON is fully taxable as income. Actual tax depends on your tax code, National Insurance, pension deductions, and total income.

Garden leave

Garden leave means you remain employed and paid during notice, but your employer does not require you to attend work.

You continue to receive full pay.
You continue to accrue holiday.
You may be restricted from working for a competitor.

Key dates

Notice given: 20 June 2026
Notice period ends: 20 September 2026
Last working day: 20 September 2026
Holiday to be taken or paid out by: 20 September 2026

What is the statutory notice period?

Statutory notice is the minimum notice an employer must give when ending employment. Employees are entitled to one week for each complete year of service, up to 12 weeks. Your contract may specify a longer period, and the longer period applies.

What is payment in lieu of notice?

Payment in lieu of notice, or PILON, is a lump sum paid instead of working the notice period. Since April 2018, PILON is subject to income tax and National Insurance as earnings.

What is garden leave?

Garden leave is when you are on notice but are not required or allowed to attend work. You remain employed, receive full pay and benefits, and continue to accrue holiday.

About this calculator

The Notice Period Calculator estimates statutory minimum notice for employees and employers based on length of service. It helps users compare the legal minimum with contract terms, redundancy notice, resignation notice, and payment in lieu of notice. Use this expanded guide when you need more than a quick result. It explains the assumptions behind the Notice Period Calculator, the records to gather, and the decisions the estimate can support. It is especially useful for employees, employers, HR teams, and managers checking minimum notice before resignation, dismissal, redundancy, or contract changes. The strongest use of the page is scenario comparison: change one input at a time, compare the output, and keep a note of which assumption changed.

Notice period method

Statutory notice depends on whether notice is given by the employer or employee and how long the employee has been continuously employed. The calculator result depends on the quality of the inputs and on the rule set or formula selected in the calculator above. For practical use, treat the output as a structured estimate: start with the core inputs, review the main outputs, then test the decision points that matter most to your situation. Key decisions include whether statutory or contractual notice is longer, how service length affects employer notice, whether final pay should include payment in lieu.

employee minimum after one month service = 1 week
employer minimum from 2 to 12 years = 1 week per complete year
employer minimum after 12 years = 12 weeks
better estimate = accurate inputs + correct rule set + realistic assumptions
scenario difference = revised result - original result

How to use the notice calculator

Choose whether notice is being given by the employer or employee.
Enter employment start date and notice date.
Enter any contractual notice period if known.
Review statutory minimum and contractual comparison.
Check whether payment in lieu of notice or garden leave applies.
Gather the main inputs first: employment start date, notice date, who gives notice.
Check supporting records such as employment contract and notice letter before relying on a final number.
Enter one realistic scenario first, using conservative assumptions where the future is uncertain.
Review the main outputs: statutory minimum notice, contractual comparison, estimated final working date.
Run at least one alternative scenario so you can see which input changes the answer most.
Compare the result with GOV.UK and ACAS notice period guidance or the relevant contract, bill, statement, or professional document.
Keep the calculation date and assumptions with your notes so you can revisit the estimate when rates, rules, or circumstances change.

Worked example

Employer notice

Input: Employee has 7 complete years service

Calculation: One week per complete year from 2 to 12 years

Result: Statutory employer notice is 7 weeks unless the contract gives more.

Employer notice scenario

Input: An employee has nine complete years of service.

Calculation: Employer statutory notice is estimated as one week per complete year up to the cap.

Result: The calculator shows nine weeks before checking whether the contract gives more.

Contract comparison scenario

Input: The contract says three months notice but statutory notice is shorter.

Calculation: The calculator compares both figures.

Result: The longer contractual notice is likely to matter unless there is a lawful exception.

Contractual notice can be longer

The statutory rules set minimum notice. A contract can require longer notice, but it cannot usually provide less than the statutory minimum. Notice pay, accrued holiday, redundancy pay, and final salary should be considered separately.

What to check before relying on the result

A useful Notice Period Calculator result starts with the same evidence you would use if you were checking the answer manually. The calculator can organise the arithmetic, but it cannot know whether a payslip is final, a bill is estimated, a quote excludes fees, or a personal circumstance has changed since the last statement.

Before making a decision, compare the calculator result with the source document that controls the real outcome. For this topic, that usually means checking GOV.UK and ACAS notice period guidance. If there is a difference between the calculator and an official statement, contract, assessment, or professional advice, treat the official document as the stronger source.

employment contract: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
notice letter: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
start date evidence: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
HR policy: Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.

Inputs that usually change the answer

The most important input is not always the largest number on the form. Sometimes a date, threshold, percentage, eligibility flag, or timing assumption changes the result more than the headline amount. This is why scenario testing is more useful than a single calculation.

Input	Why it matters	What to double-check
employment start date	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
notice date	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
who gives notice	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
contractual notice terms	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.
dismissal or resignation context	It feeds directly into the estimate or changes which rule is applied.	Check the period, units, eligibility, and whether the figure is final or estimated.

How to interpret the output

The output should be read as a decision aid, not just a number. For Notice Period Calculator, the useful question is often what the result means for timing, affordability, eligibility, comparison, or next steps.

statutory minimum notice: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
contractual comparison: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
estimated final working date: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
payment in lieu prompt: Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.

Scenarios worth comparing

A single estimate is a snapshot. A better approach is to save a base case, then adjust one assumption at a time. This shows whether the result is stable or whether a small change in timing, rate, usage, income, or cost creates a very different answer.

Scenario	Change one assumption	What the comparison shows
Base case	Use the best current evidence.	Shows the result you would expect if nothing important changes.
Conservative case	Use lower income, higher cost, slower growth, or less favourable timing.	Shows whether the decision still works with less optimistic assumptions.
Improved case	Use the realistic upside, such as lower cost, better rate, higher usage, or stronger evidence.	Shows the potential benefit without treating it as guaranteed.

Common mistakes and edge cases

Most errors come from using the right formula with the wrong assumption. Dates can be counted differently, rates can change, official thresholds can move, and real bills or contracts often include conditions that a simple calculator cannot infer automatically.

Contractual notice can be longer than statutory notice.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Gross misconduct can change notice rights.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Notice start date may depend on communication method.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Holiday and redundancy pay are separate calculations.: Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.

Next steps after calculating

Once you have a result, write down the key assumptions and compare them with GOV.UK and ACAS notice period guidance. If the number affects a deadline, tax return, benefit claim, employment issue, medical question, finance agreement, or major purchase, use the calculator as preparation for a more formal check.

For lower-stakes use, the next step may simply be comparing two or three scenarios. For higher-stakes use, the next step should be checking the official guidance, speaking to the relevant organisation, or getting qualified advice before acting.

Important edge cases

Contractual notice can be longer than statutory notice.
Gross misconduct can change notice rights.
Notice start date may depend on communication method.
Holiday and redundancy pay are separate calculations.

Limitations

This calculator is general information only and is not employment legal advice. This is general employment information and not legal advice. The calculator is designed to support understanding and planning, but it cannot verify documents, predict future rule changes, or account for every exception. Use it as an estimate and check the official source before acting where the result matters.

Dismissal for gross misconduct can change notice rights.
Contract wording can affect payment in lieu or garden leave.
Seek advice for disputes or settlement agreements.
Check GOV.UK and ACAS notice period guidance for current rules, rates, definitions, and eligibility where relevant.
Do not rely on a single scenario where income, costs, dates, rates, usage, or health circumstances may change.
Keep records of the inputs used so that the estimate can be reviewed later.

Frequently asked questions

Can my contract require more notice?

Yes. The contract can set a longer notice period than the statutory minimum.

When does notice start?

This can depend on how notice is given and contract wording, so keep written records.

Is redundancy notice different?

Redundancy notice uses the same statutory employer notice principles, but redundancy pay is a separate calculation.

Can I be paid instead of working notice?

Possibly, if the contract allows payment in lieu or both sides agree.

Does sick leave extend notice?

Not usually by itself, but pay during notice can be complicated and should be checked.

Can notice be withdrawn?

Usually only by agreement once valid notice has been given.

Related calculators

Redundancy Pay Calculator
Holiday Entitlement Calculator
Unfair Dismissal Compensation Calculator
Take-Home Pay Calculator

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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