How to Secure a New AWS Account on Day One
Updated October 5, 2026: The section on human access now reflects AWS’s current recommendation, IAM Identity Center, instead of individual IAM users.
Creating a new AWS account is an important milestone—but it’s also the point where early decisions can introduce long-term security or cost issues if they’re overlooked. Establishing a small set of baseline controls upfront makes everything that follows easier to manage and significantly reduces risk.
This post outlines a practical, day-one approach to securing a fresh AWS account before workloads are deployed.
Protect the Root Account Immediately
The AWS root account has unrestricted access to every service and setting. Because of that, it should be locked down as soon as the account is created.
Multi-factor authentication (MFA) should be enabled immediately, and the root account should not be used for daily operations. In most environments, the root account is only needed for a short list of administrative actions such as billing changes or account-level configuration.
Treating the root account as an emergency-only credential greatly reduces the impact of a potential compromise.
Use IAM Identity Center for Human Access
Never use the root user for day-to-day access. Earlier versions of this guide recommended an individual IAM user for each person. That was common advice for years, but AWS now recommends federated access with temporary credentials, using services such as IAM Identity Center (formerly AWS SSO). Each person signs in with their own identity through Identity Center’s built-in directory or an existing identity provider, such as Microsoft Entra ID or Google Workspace, and receives short-lived credentials for the accounts and roles they need.
Permissions are scoped through permission sets, and MFA should be required for everyone, not just administrators. When using an external identity provider, enforce MFA there. This approach eliminates the need to maintain separate IAM user passwords or long-lived access keys in each AWS account and centralizes access management. As part of offboarding, remove the person’s access assignments and explicitly revoke or block active sessions, which could otherwise remain valid until they expire.
To manage AWS account access, enable an organization instance of IAM Identity Center, which requires AWS Organizations. Organizations is available at no additional charge and can be used even if you currently have only one account. If Identity Center or another federation solution isn’t feasible, fall back to creating an individual IAM user for each person, enforcing MFA, and using IAM policies to limit permissions to their responsibilities.
Set an Account Alias Early
AWS account IDs are functional but hard to remember. Creating an account alias early provides a human-readable login URL and reduces confusion—especially once multiple AWS accounts are in use.
This small step improves usability without adding complexity and helps prevent users from signing into the wrong account.
Choose a Default Region Intentionally
By default, AWS allows resources to be created in any region, which can lead to accidental deployments in unexpected locations.
If an account primarily operates in a single region, setting a default region for users helps keep resources consistent and easier to manage. It also avoids common issues where resources appear “missing” because the console is pointed at the wrong region.
Enable Billing Alerts Before Workloads Go Live
Unexpected costs are one of the most common early AWS pain points. Enabling billing alerts ensures that spend is visible before it becomes a surprise.
A simple CloudWatch alarm tied to estimated charges is usually sufficient. The exact threshold matters less than having early visibility and a notification mechanism in place.
Closing Thoughts
None of these steps are complicated, but skipping them often leads to unnecessary cleanup later. Securing the root account, enforcing MFA, using IAM properly, and enabling basic cost monitoring provides a clean foundation for everything that follows.
Once these basics are in place, teams can focus on building infrastructure and applications with confidence, knowing the account itself isn’t a hidden liability.
From here, two natural next steps are locking down how instances are accessed — see Secure EC2 Access Without Open SSH or RDP Ports — and going further on cost and security with AWS Tips for Cost, Security, and Efficiency.