Identity and access management (IAM) is the set of policies, processes and tools that make sure the right people have the right access to the right systems, at the right time, and nothing more. It covers how accounts are created and removed, how people prove who they are when they sign in, and what they are allowed to do once they are in.

For most organisations, IAM is no longer a niche security project. Email, files, finance systems and line-of-business apps now live in the cloud, and people reach them from home, the office and their phones. The account someone signs in with has become the front door to the business. This guide explains how identity and access management works, why it matters, and the practical steps UK organisations can take to get it right.

What is identity and access management?

IAM has two halves that work together.

• Identity management is about who someone is. It covers creating a digital identity when a person joins, keeping their details and group memberships accurate while they work for you, and disabling the account promptly when they leave. Identities are not only people: service accounts, devices and applications have identities too.

• Access management is about what that identity can do. It covers authentication (proving you are who you say you are, usually with a password plus a second factor) and authorisation (deciding which systems and data you can reach once you are signed in).

Done well, IAM means every account belongs to a real, current person or system, every sign-in is properly verified, and every user has only the access their role needs.

Why identity and access management matters for security

Attackers increasingly log in rather than break in. Phishing emails, reused passwords and stolen sign-in sessions all give an attacker a valid account, and a valid account is far harder to spot than malware. Once inside, an over-privileged account lets them move from one system to the next, read sensitive data or change payment details.

Strong IAM reduces that risk in three ways. It makes accounts harder to take over, it limits what a compromised account can reach, and it makes unusual activity easier to detect. It also supports compliance. User access control is one of the five technical controls in Cyber Essentials, and the scheme requires multi-factor authentication on cloud services. Insurers ask about the same controls at renewal, which we cover in Cyber Insurance in 2026: What Insurers Look For.

The core building blocks of IAM

1. The identity lifecycle: joiners, movers and leavers

Most access problems start with process, not technology. New starters are given a copy of a colleague’s permissions. People who change roles keep their old access as well as their new access. Leavers’ accounts stay active for weeks. A clear joiner, mover and leaver process, ideally triggered by HR rather than an ad hoc ticket, keeps access accurate and removes accounts that attackers love to find.

2. Authentication: MFA, single sign-on and passwordless

Multi-factor authentication (MFA) is the single most effective step most organisations can take, and the NCSC recommends it for any account that supports it. Not all MFA is equal, though. Text message codes and simple approve-or-deny prompts can be phished or abused, so move towards app-based number matching and, where possible, phishing-resistant methods such as passkeys, FIDO2 security keys or Windows Hello for Business. Our article on MFA bypassing explains how attackers get around weak MFA.

Single sign-on (SSO) lets people use one strong, well-protected identity for many apps instead of a different password for each. That means fewer passwords to steal and one place to switch access off. We explain the benefits in more detail in SSO and passwordless authentication.

3. Authorisation: least privilege and role-based access

The principle of least privilege means each person has the minimum access they need to do their job, and no more. Role-based access control (RBAC) makes that manageable at scale: you define access for a role, such as finance or sales, and give people the role rather than hand-picking permissions for each individual. When someone changes roles, you change their role, not dozens of individual settings.

4. Privileged access management

Admin accounts are the keys to the kingdom, so they need extra care. Privileged access management (PAM) means keeping admin rights separate from everyday accounts, giving them only when needed and for a limited time, requiring strong MFA and logging what is done with them. Nobody should read email or browse the web while signed in as a global administrator.

5. Conditional access

Conditional access policies look at the context of each sign-in, such as the user, the device, its location and the risk level, and decide whether to allow it, require extra verification or block it. For example, you might allow access to company data only from managed, up-to-date devices, or block sign-ins from countries where you have no staff.

6. Access reviews and monitoring

Access drifts over time. Regular access reviews, where managers confirm that their team still needs what they have, catch permissions that should have been removed. Monitoring sign-in activity catches the rest. Aura’s Managed XDR service includes identity signals alongside endpoint, cloud and network activity, so suspicious sign-ins can be investigated around the clock.

Identity and access management in Microsoft 365

If your organisation uses Microsoft 365, your identity platform is Microsoft Entra ID (formerly Azure Active Directory). It is where user accounts, groups, MFA and sign-in policies live, and it can provide single sign-on to thousands of third-party apps.

• Security defaults switch on a baseline of protections, including MFA, for tenants that do not have more advanced licences.

• Conditional Access needs Microsoft Entra ID P1, which is included in Microsoft 365 Business Premium and E3 plans, and gives far finer control than security defaults.

• Privileged Identity Management and access reviews are part of the higher Entra ID tiers and help with just-in-time admin access and regular access checks.

Many tenants have these features available but only partly configured. Our guide to common Microsoft 365 security misconfigurations covers the identity settings we most often find need attention.

Identity and access management best practices: a checklist

• Enforce MFA for every user, with no permanent exceptions, and move towards phishing-resistant methods.

• Block legacy authentication protocols that cannot do MFA.

• Keep admin accounts separate from everyday accounts and give admin rights only when needed.

• Use roles and groups to grant access, rather than individual permissions.

• Tie joiners, movers and leavers to HR, and disable leavers’ accounts on their last day.

• Use single sign-on for business apps so access can be switched off in one place.

• Apply conditional access so only trusted users on trusted devices reach company data.

• Review access regularly, starting with admin roles, finance systems and sensitive data.

• Monitor sign-ins and alert on unusual activity, such as impossible travel or mass downloads.

How to build an identity and access management strategy

1. Take stock. List your identities (users, guests, service accounts), your critical apps and who has admin rights. You cannot protect what you cannot see.

2. Fix the basics. Turn on MFA everywhere, remove stale and shared accounts, and block legacy sign-in methods. These steps remove a large share of everyday risk quickly.

3. Define roles and least privilege. Agree standard access for each role and move people onto it.

4. Automate the lifecycle. Connect joiners, movers and leavers to HR so access changes happen on time, every time.

5. Add context and control. Introduce conditional access, privileged access management and single sign-on for your key apps.

6. Monitor, review and improve. Review access regularly, watch sign-in activity and test your controls, for example through penetration testing.

IAM is a journey rather than a single project. Most organisations get the biggest gains from the first two steps, then build maturity over time. It also sits at the heart of a zero trust approach, which assumes no user or device should be trusted by default. Our article on getting started with zero trust explains how the pieces fit together.

Common identity and access management mistakes

• Leaving MFA optional, or allowing long-term exceptions for senior staff or shared mailboxes.

• Giving people admin rights for convenience and never taking them back.

• Copying an existing user’s permissions for new starters.

• Forgetting guest accounts, service accounts and former suppliers.

• Treating IAM as an IT-only issue rather than a business process shared with HR and managers.

Frequently asked questions

What is the difference between identity management and access management?

Identity management deals with who someone is: creating, maintaining and removing their digital identity. Access management deals with what they can do: verifying them when they sign in and controlling which systems and data they can reach. You need both for IAM to work.

Is MFA enough on its own?

MFA is essential, but it is not the whole answer. Some forms of MFA can be phished or bypassed, and MFA does nothing to limit what a compromised account can reach. Combine it with least privilege, conditional access and monitoring.

What is the principle of least privilege?

It means giving each user, application or system only the access it needs to do its job, for only as long as it needs it. If an account is compromised, least privilege limits the damage.

What is the difference between IAM and PAM?

Identity and access management covers every identity in the organisation. Privileged access management is a specialist part of IAM that focuses on admin and other high-risk accounts, with extra controls such as just-in-time access and session logging.

Do small businesses need identity and access management?

Yes. Smaller organisations are targeted just as often, and usually have fewer people to spot a problem. The good news is that the most effective IAM controls, such as MFA, separate admin accounts and a clear leaver process, are achievable for any size of business, often with tools you already pay for in Microsoft 365.

How Aura can help

If you are not sure how strong your identity security is today, Aura’s Cyber Resilience Roadmap is a good place to start. It is a structured, scored assessment of your users, devices, cloud services and Cyber Essentials Plus readiness, turned into a prioritised plan. From there we can help you put the right controls in place and keep watch over them.

Want to talk it through? Get in touch with our team for a plain-English conversation about your identity and access management.