What Is Cloud IAM? AWS vs Azure vs Google Cloud

Between 2024 and late 2025, all three major clouds tightened cloud IAM in the same way: AWS, Microsoft Azure and Google Cloud each made multi-factor authentication mandatory for the people who manage them. AWS started with root users in 2024.

Azure extended the rule from its portal to the CLI, PowerShell and APIs on October 1, 2025, and Google phased it in for all users through 2025. When every provider forces the same control, it shows where attacks land, and why identity now sits at the center of cloud security.

Cloud IAM, short for cloud identity and access management, decides who or what can reach each cloud resource, and what they can do there. This guide explains how it works, how AWS, Azure and Google Cloud IAM differ, what’s free, and how to apply least privilege without slowing teams down.

What Is Cloud IAM?

Cloud IAM is the set of services a cloud provider uses to confirm identities and grant permissions. For every request, it answers four questions: who is asking, what they want to do, which resource they want and whether conditions such as location, device or time allow it.

In identity management in cloud computing, the “who” covers far more than employees. Contractors, applications, virtual machines, CI/CD pipelines and AI agents all hold identities and permissions, and the machine identities usually outnumber the people.

So what is IAM in cloud computing compared with an office network login? There’s no network edge to hide behind. Every console click and API call reaches a public endpoint, and IAM is the check that stands in front of it.

The benefits of identity management in cloud computing follow from that. You get one place to grant and revoke access, a log entry for every action, and controls that scale with the environment instead of with headcount.

How Does Cloud IAM Work?

Every request passes through the same four steps, whether it comes from a person in the console or a script calling an API:

1. Authentication confirms the identity with a password and MFA, a federated sign-in or a short-lived token.
2. Authorization gathers every policy that applies to that identity and resource.
3. Policy evaluation decides the outcome. Anything not explicitly allowed is denied, and on AWS an explicit deny beats any allow.
4. Logging records the result in AWS CloudTrail, Azure Activity Log or Google Cloud Audit Logs.

A policy is just those rules written down. This statement from an AWS policy lets a user read files in one bucket, but only after signing in with MFA:

{
  "Effect": "Allow",
  "Action": "s3:GetObject",
  "Resource": "arn:aws:s3:::invoices/*",
  "Condition": { "Bool": { "aws:MultiFactorAuthPresent": "true" } }
}

Azure and Google Cloud use role assignments instead of JSON, but the parts match: who, action, resource and condition.

Policies only stay accurate if accounts do. Cloud-based user management handles the joiner, mover and leaver moments automatically. Your identity provider, such as Microsoft Entra ID or Okta, pushes changes to AWS IAM Identity Center or Google Cloud through SCIM provisioning. A new hire gets access on day one, and someone who leaves loses it within minutes rather than at the next audit.

How Do AWS, Azure and Google Cloud IAM Compare?

All three cloud IAM services answer the same four questions, but they organize identities and permissions differently:

The hierarchy matters most in practice. In all three clouds, access granted at a higher level flows down to everything beneath it, so a role assigned to a whole organization reaches every project or account inside it.

What Is Google Cloud IAM?

Google Cloud IAM controls access by granting roles to principals on a resource. It offers three kinds of role:

• Basic roles, such as Owner, Editor and Viewer, which are broad and best avoided in production
• Predefined roles, scoped to a single service
• Custom roles, which you build yourself

Deny policies can block specific permissions even where a role allows them.

What is Cloud Identity, then? It’s a separate Google product that stores your users and groups. IAM decides what those users can do.

Is Google Cloud IAM Free?

Yes. Google offers Identity and Access Management at no additional charge to every Google Cloud customer. You pay only for the services your identities use, and for optional add-ons such as Cloud Identity Premium.

What Changed in Cloud IAM in 2024–2026?

Beyond mandatory MFA, two other pieces of cloud IAM news matter:

• Root accounts can now be retired. Since November 2024, AWS Organizations lets a central team remove root credentials from member accounts and perform root-only tasks centrally. Adoption lags: Intruder’s 2026 Cloud Security Index found 72% of AWS accounts still don’t manage root access this way.
• Scripts are pushed toward workload identities. Azure’s MFA rule now covers the CLI, APIs and infrastructure-as-code tools, but managed identities and service principals are exempt. Automation that still signs in as a person breaks, which nudges teams toward proper machine identities.

The reason is simple. Microsoft says MFA blocks more than 99.2% of account-compromise attacks, and stolen or phished logins remain among the most common cloud security risks.

What Is the Difference Between IAM and SSO?

Single sign-on (SSO) is one part of IAM, not an alternative to it. SSO handles cloud-based authentication: you sign in once with your identity provider, and it vouches for you to every connected app and cloud account through SAML or OpenID Connect. IAM covers everything else, from which accounts exist to what each one can do after signing in.

Teams need both: SSO without strict permissions lets one stolen login reach everything.

RBAC vs ABAC: Which Access Model Fits the Cloud?

Role-based access control (RBAC) grants permissions through job roles, such as “database reader” or “network admin.” It’s easy to audit, which is why it underpins cloud access management on all three providers. The weakness shows at scale: every new team, project or environment tends to spawn another role, until nobody knows what the 400th one allows.

Attribute-based access control (ABAC) decides using tags instead. A single AWS policy can say “engineers may manage any resource whose project tag matches their own,” comparing aws:PrincipalTag with aws:ResourceTag. New projects need a tag, not a new role. Azure adds conditions to role assignments, and Google Cloud offers IAM Conditions based on resource tags.

The RBAC vs ABAC choice isn’t really either-or. Most teams handle access management in the cloud with:

• RBAC for the stable baseline, meaning who’s an admin, a developer or an auditor
• ABAC conditions to scope those roles by project, environment or data sensitivity
• ABAC only works if tags are reliable, so lock down who can change them.

One caution: Kubernetes runs its own RBAC, separate from your cloud provider’s, so cloud roles alone don’t cover Kubernetes security.

How Do You Put Least Privilege Into Practice?

Least privilege means every identity gets only the permissions its job needs, and only for as long as it needs them. Few teams start there. Access gets granted broadly to unblock work and then never trimmed, which is why weak IAM ranks among the most common forms of cloud misconfiguration.

You don’t have to guess which permissions are unused, because each provider tracks real activity:

• AWS: IAM Access Analyzer flags unused roles, keys and permissions, and can generate a policy based on what an identity actually did in CloudTrail.
• Google Cloud: role recommendations suggest smaller roles based on the permissions each principal used over the past 90 days.
• Azure: Privileged Identity Management makes admin roles just-in-time. Users activate a role for a few hours, with approval and a reason, instead of holding it permanently.

Start with admin and production access, where excess permissions do the most damage.

When Do You Need a Cloud IAM Solution Beyond Built-In Tools?

On one cloud with a small team, built-in tools are usually enough: AWS IAM, Entra ID Free or Google Cloud IAM, plus MFA and regular reviews. Cloud-based IAM solutions start to earn their cost when one of these needs appears:

Most enterprise cloud IAM setups combine the first three: an identity provider for sign-in, PAM for the most powerful accounts and CIEM for unused access.

When comparing cloud-based identity management options, check three things:

• SCIM support for the clouds and apps you use
• Support for hardware security keys
• Audit logs you can export to your SIEM

What Are the Best Practices for Cloud IAM?

These IAM best practices close most of the gaps attackers use, and they apply on AWS, Azure and Google Cloud alike:

1. Use phishing-resistant MFA for every person. Passkeys or FIDO2 keys, not SMS codes.
2. Lock away the top accounts. Keep two break-glass admin accounts protected by hardware keys, and alert on every use.
3. Federate all workforce sign-ins. Run access through one identity provider instead of creating local users in each cloud.
4. Replace long-lived keys. Use roles, managed identities or workload identity federation, which issue short-lived credentials.
5. Remove standing admin rights. Grant elevated access just in time, and let it expire on its own.
6. Give every workload its own identity. Shared service accounts hide who did what.
7. Add conditions. Require MFA for sensitive actions, and restrict access by network, device or region.
8. Watch for changes. Stream IAM logs to a central store and alert on new keys and role changes.

Identity and access management for cloud security never finishes, so let a cloud security posture management tool check this list daily.

FAQ’s