Currently, after two continuous years in a job workers gain additional legal protections against so-called "ordinary" unfair dismissal.
It means employers must identify a fair reason for dismissal - such as conduct or capability - and show that they acted reasonably and followed a fair process.
Until last week, Labour was planning to scrap this qualifying period completely at an unspecified point during 2027, with a new legal probation period, likely to have been nine months, introduced as a safeguard for companies.
But following talks with unions and business groups last week, the qualifying period will instead be set at six months' service, and the legal probation period shelved.
The U-turn has been widely welcomed by business groups, which had warned the original proposals would discourage companies from hiring.
It has been condemned by some MPs on the left of the Labour Party, as well as the Unite union, a major donor through the affiliation fees its members pay to the party.
The government still plans to bring in new day-one rights to sick pay and paternity leave rights from April 2026.