A recruitment manager at a mid-sized logistics firm in Leeds put it bluntly last month: "We used to treat the first six months as a trial run in every sense but the legal one. Now the legal one matters just as much." She's not wrong. The Employment Rights Bill, working its way through the final stages of implementation this year, removes the two-year qualifying period that has let employers dismiss new hires with minimal formality since 2012. In its place comes a statutory "initial period of employment" — day-one protection against unfair dismissal, softened by a lighter-touch process while someone is still bedding in.
For anyone hiring between now and Christmas, this isn't a distant policy debate. It changes what a job offer letter should say, how a first review conversation gets documented, and what happens if a new starter simply isn't working out.
What the two-year rule actually did
Under the old system, an employee needed two years' continuous service before they could bring an ordinary unfair dismissal claim at an employment tribunal. Below that threshold, an employer could end someone's contract for almost any reason — poor fit, a personality clash with the team, a role that turned out different from the job spec — provided they weren't discriminating on a protected characteristic or breaching an automatically unfair reason such as whistleblowing or pregnancy. That two-year buffer became the default probation logic for UK businesses: keep the paperwork light in year one, worry about process later. Employment lawyers at firms like Lewis Silkin and Slater and Gordon have spent much of the past eighteen months telling clients that logic no longer holds.
The new initial period, and why "probation" is the wrong word for it
Once the relevant provisions come into force, unfair dismissal protection starts on day one of employment. But the government has built in a statutory initial period — widely expected to run for around nine months, though ministers have left themselves room to set it shorter — during which a modified, lighter-touch dismissal process applies. Employers won't need to run a full disciplinary or capability procedure to end someone's employment in this window. What they will need is a fair reason and a basic, documented conversation: telling the employee why it isn't working and giving them a genuine chance to respond before the decision is final.
Calling this a "probation period" undersells what's changed. A probation period in the old sense was a contractual label with no independent legal force — you could call the first three months whatever you liked and it made no difference to dismissal rights, because the two-year rule did the real work. The initial period is different: it's a statutory concept with its own compensation regime, and ACAS is expected to issue a dedicated Code of Practice covering the lighter-touch process specifically. Get that process wrong — skip the conversation entirely, dismiss for a reason that's actually discriminatory, or fail to document anything — and you're exposed to a tribunal claim from week one, not year three.
What changes in the offer letter and the first month
Employers should stop writing three- or six-month probation clauses as if they're the legal safety net. They aren't, and treating them that way is the single most common mistake we're already seeing among smaller employers who haven't updated their template contracts. A probation clause still has a role — it can shorten notice periods and set an earlier review date — but it no longer determines whether a dismissal needs a fair process behind it.
What matters instead is what happens in the first conversation with a struggling hire. Write down the specific problem — missed deadlines, a client complaint, a skills gap that wasn't apparent at interview — on the date it happens, not three weeks later when you've decided to let someone go. Give the employee a chance to respond in that same conversation, even informally. Keep the note. None of this needs to be a full HR investigation; the whole point of the lighter-touch process is that it stays proportionate. But "proportionate" still means something exists on paper, and right now most SME hiring managers have nothing.
Where the exposure actually sits
The cap is on the payout, not on whether you end up in front of a tribunal at all.
Compensation for a successful claim brought during the initial period is expected to be capped at a lower level than a standard unfair dismissal award — the government has floated a fixed, reduced sum rather than the full compensatory framework that applies after the initial period ends. That caps the financial downside of getting a single dismissal wrong. It does not remove it, and it does nothing for the time cost: even a capped claim still means a tribunal listing, legal fees, and a manager's afternoon spent preparing a witness statement instead of running the business.
The Federation of Small Businesses has been the loudest voice warning that this lands hardest on employers without an HR function — the five-person accountancy practice or the twelve-person warehouse operation that has never needed a documented dismissal process because nobody ever challenged one. The CIPD's own guidance takes a more measured line: most of the new administrative burden, it argues, is a habit change rather than a resourcing problem. Both are right, in different ways. A templated process — a one-page checklist, a standard letter, a note-taking habit — closes most of the gap for a small employer without hiring an HR advisor. What it doesn't fix is the manager who's never had to justify a decision they used to make on gut feel alone.
Recruitment agencies are already rewriting how they brief clients
Speak to anyone at the Recruitment and Employment Confederation and you'll hear the same thing: agencies placing permanent staff are now building the initial-period conversation into their client briefings as standard, the way they've long covered right-to-work checks. That's the right instinct, and businesses hiring directly should copy it. Before you extend an offer this autumn, decide what your process for the first nine months actually looks like — not as a compliance exercise, but as a real answer to the question "what do we do if this doesn't work out?" If your honest answer is "we've never had to think about it," that's the gap to close before the next offer letter goes out, not after the first dismissal goes wrong.
The interview process is quietly changing too
If getting a dismissal wrong now carries day-one risk, the logical response from a lot of hiring managers is to spend longer getting the hiring decision right in the first place, and that's exactly what's showing up in briefings from agencies like Hays and Reed this quarter. References are being chased before an offer goes out rather than after, a habit that lapsed at plenty of firms during the tight labour market of 2022 and 2023. Second-interview panels are including someone from outside the immediate team, specifically to catch the personality-clash problem before it becomes a week-four dismissal. None of this is regulatory — nothing in the Employment Rights Bill requires a second interview or an earlier reference check. It's simply that the cost of a bad hire has shifted from "manageable in year one" to "needs a proper process from day one," and sensible employers are pricing that in before the offer stage rather than after.
Job seekers should expect this shift too, and it cuts both ways. A slower, more careful hiring process is frustrating if you're trying to leave a job you hate by September, but it also means the offer you do get is more likely to reflect genuine confidence in the fit rather than a fill-the-desk decision the employer can walk back cheaply in month two. Candidates negotiating start dates this autumn have a reasonable case for asking what the employer's initial-period review process actually looks like — a firm that can answer specifically is one that's done the work; a firm that shrugs is one still running on the old two-year assumption.
Seasonal and volume hiring faces the sharpest adjustment
Retail and hospitality employers taking on staff for the Christmas trading period sit closest to the exposure, because volume hiring has always leaned on the assumption that a handful of hires won't work out and can be let go without ceremony. That assumption gets more expensive under the new rules, even with the lighter-touch process and the lower compensation cap for initial-period claims. A supermarket chain bringing on 200 seasonal warehouse staff across October and November can't realistically run an individual documented conversation for every underperformer the way a twelve-person office can — which is exactly why several large retailers have already moved to standardised, templated initial-review paperwork rather than leaving it to individual store managers' discretion. Smaller seasonal employers without that infrastructure are the ones most likely to get caught out, precisely because Christmas hiring has always been the part of the calendar where corners get cut on process.
There's a genuine tension worth naming here: the whole point of flexible seasonal hiring is speed, and the new rules add friction exactly where speed used to matter most. Employers who've built seasonal hiring around informal chats and a WhatsApp group for the shift team are going to feel this reform more than the ones who already ran things by the book. That's not a reason to avoid seasonal hiring this autumn — it's a reason to spend an afternoon now writing the one-page process you'll actually need in November, rather than improvising it after the first difficult conversation.
One thing the reform doesn't touch
Automatically unfair reasons for dismissal — discrimination, whistleblowing, asserting a statutory right, pregnancy and maternity-related dismissal — were never subject to the two-year rule in the first place, and the initial period changes nothing about them. An employer who dismisses a new hire for raising a health and safety concern is just as exposed under the old rules as the new ones. The genuine shift is narrower than some of the autumn hiring-panic headlines suggest: it's about the ordinary "this isn't working out" dismissal, the one that used to need no process at all and now needs a light one.
Hiring managers who get the process right this autumn will find it costs them very little — a documented conversation, a dated note, a chance for the employee to respond. Hiring managers who assume nothing has changed because the headline word is still "probation" are the ones who'll be explaining a tribunal claim to their finance director in February.