Onboarding New Employees

Bringing a new employee into your business is one of the most important processes you will manage as an employer. Done well, onboarding accelerates productivity, reduces staff turnover and sets the tone for a positive working relationship. 

However, when onboarding is done poorly, it can leave new starters feeling unsupported, confused and disengaged from day one.

This guide from ACI covers everything UK employers need to know about onboarding new employees.

While not intended as a substitute for qualified legal or HR advice, we hope this information will make your onboarding protocols a success for both new starters and ultimately, your business. 

Employee onboarding is the process of integrating a new hire into your organisation. It covers everything that happens from the moment an offer is accepted through to the point at which the employee is fully settled, competent and confident in their role.

Here In the UK, onboarding has both a legal and a practical dimension. Employers have statutory obligations around employment documentation, right to work checks and health and safety induction. Beyond compliance, the most effective onboarding programmes also address the social, psychological and developmental needs of new starters.

Before any new employee starts work, there are a number of legal obligations you must fulfil as a UK employer. Getting these right protects your business and ensures a smooth start for your new hire.

Under the Immigration, Asylum and Nationality Act 2006, all UK employers are legally required to check that every employee has the right to work in the UK before they begin employment. Failure to carry out these checks correctly can result in a civil penalty of up to £20,000 per illegal worker.

Acceptable documents include a valid UK passport, a biometric residence permit or a share code obtained through the Home Office online right to work checking service. Keep a copy of the documents you check and record the date of the check.

Under the Employment Rights Act 1996, as amended by the Good Work Plan reforms that came into effect in April 2020, all employees and workers are entitled to a written statement of employment particulars from day one. This document must include:

This written statement is separate from a full contract of employment, though many employers combine both documents.

Before your new employee receives their first pay, you must register them through PAYE (Pay As You Earn) with HMRC. You will need to collect a P45 from their previous employer or, if this is unavailable, have them complete a starter checklist. Ensure their National Insurance number is confirmed and that the correct tax code is applied from the outset.

Under the Pensions Act 2008, eligible employees must be automatically enrolled into a qualifying workplace pension scheme. Employees aged between 22 and state pension age who earn above the auto-enrolment earnings threshold (£10,000 per year as of 2024) must be enrolled from their first day of employment. Inform your new starter about their pension rights and contributions as part of the onboarding process.

Health and safety induction is not optional. UK employers have a statutory duty of care under the Health and Safety at Work etc. Act 1974, and the Management of Health and Safety at Work Regulations 1999 require employers to provide adequate health and safety training to all new employees.

A thorough health and safety induction should cover the following areas:

Employers must carry out suitable and sufficient risk assessments under Regulation 3 of the Management of Health and Safety at Work Regulations 1999. Where a risk assessment identifies hazards relevant to a new employee’s role, they must be informed of those risks and the control measures in place before they begin carrying out that work.

For roles involving specific equipment, substances or working environments, additional regulations may apply. These include the Control of Substances Hazardous to Health Regulations 2002 (COSHH), the Provision and Use of Work Equipment Regulations 1998 (PUWER), and the Lifting Operations and Lifting Equipment Regulations 1998 (LOLER), among others.

If your new employee will be working regularly with display screen equipment, including computers, laptops and tablets, you are required under the Health and Safety (Display Screen Equipment) Regulations 1992 to carry out a DSE workstation assessment. This applies to both office-based and home workers.

The assessment should consider chair and desk height, monitor positioning, lighting, keyboard and mouse placement and any individual needs the employee may have. Provide any necessary adjustments or equipment before or as close to the start date as possible.

When onboarding new employees, employers have a duty of care that extends to mental health as well as physical safety. Under the Management of Health and Safety at Work Regulations 1999, stress is a recognised workplace hazard and must be managed accordingly. As part of your onboarding process, introduce new starters to any mental health support resources available to them, including employee assistance programmes (EAPs), mental health first aiders and relevant policies such as stress management or flexible working procedures.

Beyond legal compliance, the practical mechanics of onboarding have a direct impact on how quickly new employees become effective in their roles and how likely they are to stay. The following steps form the backbone of a well-organised onboarding programme.

The period between offer acceptance and the first day is often underused. Use this time to send a welcome message, provide any pre-reading or handbooks, confirm logistics such as start time and location and ensure all equipment and access credentials are ready. A poor first-day experience frequently begins with a missing laptop or no access to key systems.

Avoid overwhelming a new starter with back-to-back inductions. A well-paced first week might include:

Avoid front-loading the entire onboarding process into a single overwhelming day. Learning takes time and retention is significantly higher when information is delivered in manageable stages.

Most UK employers operate a probationary period, typically of three to six months. This should be treated as a structured support and development period rather than simply a trial. Schedule regular one-to-one meetings throughout the probation period to discuss progress, address any concerns early and provide constructive feedback.

At the end of the probation period, hold a formal review to confirm employment, extend the probation with a development plan or, where necessary, end the employment in line with the terms set out in the contract.

When onboarding new employees, pairing new starters with an experienced colleague as a buddy or informal mentor can significantly improve the onboarding experience. A buddy provides a safe point of contact for questions that a new employee might feel reluctant to raise with their manager, and helps them navigate the social and cultural dimensions of a new workplace more quickly.

Effective onboarding goes beyond paperwork and process. People join organisations as whole human beings, bringing with them anxieties, ambitions, personal circumstances and social needs. The most successful onboarding programmes acknowledge this and take deliberate steps to support wellbeing, belonging and long-term engagement.

Research consistently shows that a sense of belonging at work is one of the strongest predictors of employee engagement, productivity and retention. When onboarding new employees, actively create opportunities for new starters to connect with colleagues across the business, not just within their immediate team.

This might include structured introductions to cross-functional teams, invitations to team social events, or access to employee networks and communities. For remote workers, intentional effort is required to replicate the informal connection that happens naturally in a shared workspace.

New employees are particularly vulnerable to feeling that they cannot ask questions, admit uncertainty or raise concerns without negative consequences. Establish psychological safety from the very beginning by explicitly encouraging questions, normalising the learning curve and modelling open communication at a senior level.

Line managers play a critical role in onboarding new employees. The quality of the relationship between a new starter and their direct manager during the first few months has an outsized impact on their decision to stay with the organisation long-term.

Under the Equality Act 2010, employers have a duty to make reasonable adjustments for employees with disabilities or long-term health conditions. The onboarding process should include a confidential conversation about any adjustments the employee may need, whether related to workspace setup, working hours, communication preferences or access to materials.

Inclusive onboarding also means being mindful of neurodiversity. Employees who are autistic, have ADHD, dyslexia or other neurodivergent profiles may experience traditional onboarding processes very differently. Offering flexibility in how information is delivered and how tasks are introduced can make a significant difference to their experience.

Use the following as a starting point for your own onboarding checklist:

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