Employee Onboarding Checklist UK 2026: Complete HR Guide + Free Template

Getting onboarding right is one of the highest-impact things you can do as an employer. Research consistently shows that employees who experience structured onboarding are 69% more likely to stay with the company for at least three years. Yet most UK small businesses wing it — a quick handshake, a stack of paperwork, and a "just ask if you need anything." This guide gives you a complete, practical onboarding checklist that covers every legal requirement and every step from pre-start through the first 90 days.

Why onboarding matters

Poor onboarding doesn't just leave new employees feeling lost — it directly impacts your business:

Retention — 20% of employee turnover happens within the first 45 days. A structured onboarding process dramatically reduces early attrition.
Productivity — employees who are onboarded properly reach full productivity up to 50% faster than those who aren't.
Engagement — first impressions set the tone. A chaotic first week signals to the new hire that the company is disorganised — and that impression sticks.
Compliance — UK employment law requires specific actions during onboarding (right to work checks, written statement of terms, pension enrolment). Missing these creates legal risk.
Cost — replacing an employee costs 6–9 months' salary on average. Spending a few hours on proper onboarding is the cheapest retention strategy that exists.

Legal requirements for UK onboarding

Before we get to the practical checklist, here are the legal obligations you must fulfil when onboarding a new employee in the UK:

Right to work check

You must verify that every new employee has the legal right to work in the UK before their first day of work. This applies to all employees, regardless of nationality. You need to see original documents (passport, visa, biometric residence permit, etc.), check they're genuine, and keep a dated copy. Since 2022, you can also use the Home Office online checking service for employees with a share code. Failure to conduct right to work checks can result in a civil penalty of up to £60,000 per illegal worker (2026 rates).

HMRC starter checklist (or P45)

The new employee must provide either a P45 from their previous employer or complete an HMRC Starter Checklist (which replaced the P46). This determines their tax code and ensures they're taxed correctly from their first pay. You must submit this information to HMRC via your payroll system before their first payday.

Written statement of employment terms

Since April 2020, all employees and workers are entitled to a written statement of their main terms on or before their first day of work — not within two months as was previously the case. This statement must include: employer and employee names, start date, job title/description, pay details, hours, holiday entitlement, notice periods, and probation period. A separate wider written statement covering sick leave, pensions, and other policies must be provided within two months.

Pension auto-enrolment

If the new employee is aged 22 or over and earns more than £10,000/year (2026/27 threshold), you must auto-enrol them into a workplace pension. You must do this from their first day of employment — but you have a choice of whether to backdate to day one or use a postponement period of up to 3 months. You must write to the employee within 6 weeks of their start date to inform them about auto-enrolment.

Other legal requirements

National Minimum Wage — ensure the employee is being paid at least the current NMW/NLW rate for their age bracket.
Working time opt-out — if you need the employee to work more than 48 hours per week, they must sign an opt-out agreement voluntarily.
Health and safety — you must provide information about fire exits, first aiders, and any role-specific hazards.
Data privacy — inform the employee about how their personal data will be processed (your privacy notice).

Complete onboarding checklist

Here's the full checklist, broken into phases. Use this as a template for your own onboarding process.

Before day one (pre-boarding)

The best onboarding starts before the employee walks through the door. Use the time between offer acceptance and start date to get everything ready:

☐ Send the employment contract — include the written statement of terms. Get it signed and returned before day one.
☐ Conduct right to work check — verify documents and store dated copies.
☐ Set up IT accounts — email, Slack/Teams, HR system, any tools they'll need on day one.
☐ Order equipment — laptop, monitor, phone, desk setup (especially for remote/hybrid workers).
☐ Prepare their workspace — desk, chair, stationery, welcome pack if you have one.
☐ Send a welcome email — include start time, location/directions, dress code, who to ask for, and what to bring (ID, bank details).
☐ Assign a buddy — pair them with a friendly colleague who can answer the day-to-day questions managers often forget about.
☐ Notify the team — let existing employees know who's joining, their role, and when they start.
☐ Prepare the first-week schedule — block out training sessions, introductions, and 1:1 time with their manager.
☐ Add to payroll — ensure they're set up for their first payday.

Day one

First impressions are everything. Day one should be structured but not overwhelming:

☐ Welcome and introductions — greet them personally. Don't leave them waiting in reception.
☐ Office/site tour — toilets, kitchen, fire exits, meeting rooms, first aiders.
☐ Complete HR paperwork — P45 or HMRC Starter Checklist, bank details for payroll, emergency contact details, next-of-kin form.
☐ Health & safety briefing — fire procedures, first aid locations, any role-specific safety information.
☐ IT setup — laptop, email, system logins, VPN (if remote/hybrid). Test everything works.
☐ Set up HR system access — send Leavely invite so they can see their leave balance and team calendar from day one.
☐ Share the employee handbook — covering leave policies, sickness procedures, flexible working, and company expectations.
☐ Introduce their buddy — make sure the buddy has time blocked out to be available.
☐ Lunch with the team — don't let them eat alone. Even something simple goes a long way.
☐ End-of-day check-in — 10 minutes with their manager to answer questions and confirm the plan for tomorrow.

Week one

The first week is about orientation, building relationships, and getting the foundations right:

☐ Role-specific training — core systems, processes, and tools they need for their job.
☐ Team meetings — include them in regular team standups, retrospectives, or planning sessions.
☐ 1:1 with line manager — discuss role expectations, immediate priorities, and how they prefer to receive feedback.
☐ Complete mandatory e-learning — GDPR, health & safety, anti-bribery, equality & diversity (whatever applies to your business).
☐ Cross-department introductions — short meetings with key people in other teams they'll interact with.
☐ Pension auto-enrolment letter — if eligible, send the auto-enrolment notification.
☐ End-of-week check-in — how was their first week? Any blockers? Anything they need?

First month

By the end of month one, the new employee should be settling into their role and contributing:

☐ Set probation goals — agree clear, measurable objectives for the probation period.
☐ Weekly 1:1s with manager — short, regular check-ins to track progress and address concerns early.
☐ Provide early feedback — don't wait until the probation review. Positive and constructive feedback early on helps the employee adjust.
☐ Check they have everything they need — tools, access, training, clarity on their role.
☐ Buddy check-in — is the buddy relationship working? Does the new starter feel supported?
☐ Confirm payroll is correct — check their first payslip together. Payroll errors in month one erode trust fast.

First 90 days

The 90-day mark is a critical milestone. This is where onboarding transitions into ongoing performance management:

☐ Probation review meeting — formal review against the objectives set in month one. Document the outcome.
☐ Probation sign-off (or extension) — confirm successful completion of probation in writing. If performance isn't where it needs to be, extend the probation with clear improvement targets.
☐ Gather feedback — ask the new employee about their onboarding experience. What worked? What could be improved? Use this to refine the process for future hires.
☐ Set ongoing objectives — transition from probation goals to regular performance objectives.
☐ Review leave entitlement — confirm the employee understands their leave allowance, how to book time off, and any carry-over rules.

How to digitise onboarding

Paper checklists and email chains break for the same reasons spreadsheets break for leave tracking — they get lost, they're not updated, and there's no visibility. When onboarding involves multiple people (HR, IT, the line manager, the employee themselves), a paper checklist can't tell you what's been completed and what's still outstanding.

A digital onboarding system solves this by:

Creating templates — define a standard checklist once, then apply it to every new hire. Customise per role if needed.
Assigning tasks to specific people — IT sets up the laptop, HR prepares the contract, the manager books the 1:1. Everyone knows what they're responsible for.
Tracking progress in real time — at any point, you can see what's done and what's outstanding. No chasing required.
Setting deadlines and reminders — automated nudges for overdue tasks mean nothing falls through the cracks.
Keeping a record — every completed task is logged with a timestamp and who completed it. Useful for compliance and audits.

How Leavely's onboarding feature works

Leavely includes onboarding checklists as part of its standard £8/user/month plan. Here's how it works:

Create a template — build your onboarding checklist with tasks grouped by phase (pre-boarding, day one, week one, etc.). Assign each task to a role: HR, manager, IT, or the employee themselves.
Apply to a new hire — when you add a new employee, apply the onboarding template. Tasks are automatically assigned to the right people with due dates relative to the start date.
Track progress — a dashboard shows the status of every onboarding in progress. See at a glance which tasks are complete, pending, or overdue.
Automated reminders — Leavely sends email reminders for upcoming and overdue tasks. No manual chasing.
Employee self-service — the new employee logs in and sees their own onboarding tasks: submit bank details, read the handbook, complete e-learning, etc.
Audit trail — every task completion is logged. You have a complete, timestamped record of the onboarding process for every employee.

The onboarding feature works alongside Leavely's core leave management, so the new employee is automatically set up with their leave allowance, added to the team calendar, and ready to book time off from day one.

Common onboarding mistakes

Even with a checklist, these mistakes trip up businesses regularly:

1. Information overload on day one

Dumping every policy, process, and piece of training on the new hire in their first day is overwhelming and counterproductive. Spread it out. Day one should cover the essentials: introductions, workspace, IT access, and safety. Everything else can wait.

2. No structured first week

"Just shadow Sarah for a few days" is not a plan. The new employee needs a clear schedule with defined activities, meetings, and training sessions. Leaving them to figure it out signals that you don't value their time or development.

3. Skipping the right to work check

This is a legal requirement, not a nice-to-have. The check must be completed before the employee starts work. Not on day one — before day one. Getting this wrong exposes you to fines of up to £60,000 per worker.

4. No contract before day one

Since 2020, employees must receive a written statement of terms on or before their start date. Sending the contract "when HR gets around to it" is non-compliant. Prepare and send it as soon as the offer is accepted.

5. Forgetting about remote/hybrid workers

If the new hire is remote or hybrid, onboarding requires extra thought. Equipment must arrive before day one. Video calls replace office tours. The buddy system becomes even more important. Don't just replicate the in-office experience over Zoom — redesign it for remote.

6. No check-ins after week one

Onboarding doesn't end after the first week. The first 90 days are critical. Regular 1:1s, feedback, and probation reviews keep the new employee on track and prevent small problems from becoming big ones.

7. Not asking for feedback

New employees see your business with fresh eyes. Ask them what worked and what didn't in their onboarding. This feedback is gold for improving the process for future hires.

Frequently asked questions

When should onboarding start?

Before day one. The period between offer acceptance and start date (sometimes called "pre-boarding") is your opportunity to get admin out of the way so the first day can focus on people and culture, not paperwork.

How long should onboarding last?

At minimum, 90 days. The first day and first week are intensive, but structured onboarding should continue through the probation period. Many successful businesses extend onboarding touchpoints to 6 months for senior or complex roles.

What about probation periods?

Probation periods are not a legal requirement in the UK, but they're standard practice. Typical lengths are 3 or 6 months. During probation, you can usually give shorter notice to end employment — but you must still follow a fair process. Document everything: objectives, feedback, and the final review outcome.

Do I need a different checklist for different roles?

The core checklist (legal requirements, IT, HR paperwork) is the same for everyone. But role-specific training, introductions, and objectives will vary. Create a base template and customise it per department or role.

What's the biggest onboarding mistake employers make?

Treating onboarding as paperwork. The legal and administrative tasks are important, but they're table stakes. The real value of onboarding is making the new employee feel welcome, connected, and set up for success. If they walk away from week one thinking "I'm just a number here," no amount of compliance checklists will save the situation.

Can Leavely handle onboarding for all team sizes?

Yes. Leavely's onboarding checklists work for teams of any size, from 5 to 500+. The template system means you set up the process once and apply it consistently to every new hire. See pricing for details.