What is automatically unfair dismissal?

Some reasons for dismissal are so serious that they're automatically unfair, even if you've only worked there a few weeks. If your employer fires you for a protected reason, you can claim unfair dismissal at tribunal without needing the usual 2-year service requirement (which changes to 6 months in January 2027 anyway).

This protection is very strong because it covers fundamental rights and protections that should never be a reason for firing someone.

• Pregnancy or maternity: Being dismissed because you're pregnant or on maternity leave
• Parental leave: Maternity, paternity, adoption, or parental leave
• Whistleblowing: Reporting wrongdoing, illegal conduct, or health and safety breaches
• Protected disclosures: Reporting breaches of law in good faith
• Asserting statutory rights: Asking for minimum wage, working time rights (breaks, holidays), or written terms
• Trade union activity: Joining a union or taking part in union activities
• Jury service: Taking time off for jury service
• Exercising legal rights: Using rights under employment law (requesting flexible working, taking time off for dependants)
• Discrimination: Being dismissed for age, disability, sex, race, religion, sexual orientation, pregnancy, or gender reassignment
• Health and safety: Raising health and safety concerns or refusing to work in unsafe conditions

These reasons are automatically unfair because they protect fundamental rights and public interests. If your employer could sack you for being pregnant, reporting a crime, or asking for your legal rights, employment law would be meaningless.

The law recognises that employees shouldn't have to choose between their fundamental rights and keeping their job.

• No service requirement: You can claim on day one if you're dismissed for a protected reason
• No "fair process" exception: It doesn't matter if your employer followed a fair procedure—the reason itself is unfair
• Compensation: You can claim unfair dismissal compensation, and amounts are usually higher for automatically unfair dismissals
• Quick action required: You still need to contact ACAS within 3 months minus 1 day of dismissal

Act immediately. Contact ACAS on 0300 123 1100 within 3 months minus 1 day of your dismissal.

Document everything. Keep copies of your dismissal letter, any communications, and evidence of the protected reason.

Explain the protected reason. When you contact ACAS, clearly state why you believe your dismissal was automatically unfair (e.g. "I was dismissed while on maternity leave").

ACAS will help. They'll attempt conciliation with your employer. Many cases settle at this stage.

No time limit after conciliation. Once ACAS conciliation is underway, there's no upper time limit for automatically unfair dismissal claims (unlike other unfair dismissal claims).