For centralized workforce access to multiple AWS accounts, use an organization instance of AWS IAM Identity Center. Connect it to one authoritative identity source, assign reusable permission sets to groups and accounts, and automate administration before user, account, or role counts approach AWS quotas. An account instance is appropriate only for account-scoped requirements; it does not provide the same organization-wide account-access model.
Choose the right IAM Identity Center instance
| Decision | Organization instance | Account instance |
|---|---|---|
| Scope | Central administration across an AWS Organization | Needs confined to one AWS account |
| Multi-account workforce access | Supports centrally managed AWS account access through permission sets | Does not provide the organization-wide model |
| AWS guidance | AWS describes this as the best-practice choice and recommends it for production application use | Use when account-level scope is intentional |
| Application-only access | Permission sets are optional when the requirement is only application access | Can serve account-level application needs |
The instance choice is an architectural boundary, not a later convenience setting. Decide it before building assignments and provisioning workflows.
How centralized account access works
- Users authenticate through the selected identity source. IAM Identity Center supports its built-in directory, an external identity provider such as Okta or Microsoft Entra ID, or on-premises/AWS Managed Active Directory.
- Groups receive assignments. A group (or, less preferably, an individual user) is assigned a permission set and one or more AWS accounts.
- Identity Center provisions roles. For each assignment, the service creates a service-managed IAM role in the target account and attaches the policies defined by the permission set.
- Changes propagate. Updating a permission set updates the corresponding provisioned roles; removing an assignment removes that access after provisioning completes.
A permission set is a reusable policy template, not a user record and not an application entitlement. AWS defines it as a template containing one or more IAM policies.
Select one identity source and make it authoritative
An AWS Organization can have only one IAM Identity Center identity source. The built-in Identity Center directory is configured by default unless another source is selected. Choose the system that already governs workforce identity, group membership, joiner/mover/leaver processes, and multifactor authentication.
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External identity provider
Use an IdP such as Okta or Microsoft Entra ID when it is already the corporate system of record. Provisioning and deprovisioning should originate there, with a tested synchronization path into Identity Center.
Active Directory
On-premises or AWS Managed Active Directory can remain the authoritative directory when existing directory groups and lifecycle controls are central to access governance.
Built-in Identity Center directory
This is practical for organizations that do not need an external directory. It also means Identity Center becomes responsible for maintaining users and groups, so establish an explicit offboarding procedure.
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With an external IdP or Active Directory, deleting a matching record only in Identity Center does not fully deprovision the externally managed identity. AWS advises removing assignments before deprovisioning users or groups.
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Model assignments around groups
Groups are logical collections of users. Assigning a permission set to a group makes membership changes affect access dynamically and avoids maintaining hundreds of individual assignments. IAM Identity Center does not support nested groups, so flatten any hierarchy required for authorization into directly assignable groups.
A practical group pattern
- Create groups that represent job functions or controlled access tiers, such as read-only operations, deployment operators, and security auditors.
- Assign each group only the accounts and permission sets needed for that function.
- Keep membership changes in the identity system of record and require an approval path for privileged groups.
- Remove account and permission-set assignments before deleting a group or deprovisioning its members.
Design permission sets for least privilege
Start with a predefined permission set when it matches the job, then use observed usage to narrow the policy. AWS recommends selecting the most restrictive permission set needed rather than defaulting to AdministratorAccess.
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Refinement workflow
- Define the task and target accounts before creating the assignment.
- Start with a suitable predefined set or a narrowly scoped custom policy.
- Test the role with representative operations before inviting users.
- Use IAM Access Analyzer findings about policy usage to identify permissions that can be removed, then review the resulting policy for omissions and unintended access.
- Set a reasonable account session duration. AWS documents a one-hour default and a configurable maximum of 12 hours; workforce portal session duration has separate settings and limits.
Access Analyzer can inform policy refinement; it is not proof that a generated policy is complete or safe without human review.
Know what permission sets do not cover
Permission sets govern workforce access to AWS accounts by provisioning IAM roles. They do not grant permissions to AWS managed applications.
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If a requirement needs a custom trust policy, role tags, or configurable IAM role paths, AWS documents account access manager as an option for assigning existing IAM roles to Identity Center users and groups. Evaluate that approach separately from permission-set design.
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When organization controls are required
AWS notes that IAM Identity Center identity information can be available to AWS managed applications across an organization. Organizations service control policies (SCPs) can constrain where that identity information is accessible and where applications can be started. Treat SCPs as a separate organization-level control and validate their effects carefully.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Plan administration before the estate becomes large
AWS recommends central administration through the CLI and APIs when an organization exceeds any of these thresholds:
| Resource | AWS-stated administration threshold |
|---|---|
| Users | 50,000 |
| Groups | 10,000 |
| Permission sets | 500 |
| Applications | 3,000 |
These are signals to adopt an automated operating model, not service limits. Use idempotent assignment code, record provisioning status, handle API throttling, and make removals auditable. Keep the console for investigation and exceptional changes rather than as the only source of truth.
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Review quotas and role capacity
The following are AWS-published default quotas or limits documented for IAM Identity Center; they can change and some are adjustable. Confirm current values in AWS Service Quotas for the relevant account and Region before committing to a design.
| Quota or limit | Documented value | Qualification |
|---|---|---|
| Identity Center identity-store users | 200,000 | Default quota |
| Identity Center identity-store groups | 100,000 | Default quota |
| Permission sets | 3,500 | Default service quota |
| IAM Identity Center API transactions | 20 per second collectively | Default API quota |
| AWS accounts | 7,000 | Documented additional quota |
| Applications | 7,000 | Documented additional quota |
| Enabled Regions | Six per instance | Can be increased |
| Provisioned permission sets per account | 500 | Default; adjustable by quota request |
| One ALL_PROVISIONED_ACCOUNTS provisioning call | 3,500 accounts | Larger fan-out requires single-account calls, subject to API behavior and concurrency |
Provisioned permission sets become IAM roles, so the target account’s IAM role quota is an independent constraint. AWS documents a default quota of 1,000 IAM roles per account. A design can therefore hit account role capacity even while Identity Center’s global quotas remain available.
Quick Recap
Implementation checklist
- Confirm that an organization instance is required and that AWS Organizations is structured for the target accounts.
- Choose one identity source and document which system owns users, groups, provisioning, and offboarding.
- Create directly assignable groups; do not depend on nested groups.
- Define permission sets by job function and account boundary, starting with the least privilege that supports the work.
- Test assignments and session durations before broad rollout.
- Automate assignments, provisioning checks, retries, and removals through CLI or APIs as scale increases.
- Track IAM role usage in every target account, not only Identity Center quotas.
- Use SCPs and existing IAM roles where application or trust-policy requirements exceed permission-set capabilities.
- Recheck live quotas and Region limits before production launch and during expansion.
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