The government has U-turned on its manifesto commitment to offer all workers the right to claim unfair dismissal from their first day in a job.
Ministers now plan to introduce the right after six months instead, after business groups voiced concerns it would discourage firms from hiring.
The government argued it was making the climbdown to stop its employment legislation being delayed in the House of Lords, where it has run into opposition.
Other new day-one rights to sick pay and paternity leave will still go ahead, coming into effect in April 2026.
A source said most unions backed the changes, though Unite said the U-turn would "damage workers' confidence".
