Resignation notice periods in the UK
Your notice period is the time you remain employed after resigning. Acas says the written statement of employment particulars must state how much notice an employee must give, and a contract or staff policy may require more than the statutory minimum.
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Check the notice term that applies to you rather than assuming a standard period.
Know the statutory minimum
Acas and GOV.UK say an employee who has worked for at least one month generally must give at least one week’s notice, subject to exceptions.
Contractual notice can be longer
Your employment terms may require more notice than the statutory minimum.
Leaving early needs care
If you want to leave before the notice period ends, discuss it with your employer. Acas recommends getting any alternative agreement in writing.
Serious breach situations are different
If you believe your employer has seriously breached your contract and you feel forced to resign, constructive dismissal and notice can be complex. Get appropriate advice before relying on a standard resignation letter.
Official source: Acas: notice when resigning. Employment circumstances vary, so check current official guidance where necessary.