I created a new Postgres database on the AWS RDS free tier. Everything was set up using the free tier: Amazon RDS Single-AZ db.t3.micro (details about my setting here)

And at the end of page, I`ve got this info below:

Estimated Monthly costs DB instance 13.14 USD Storage 2.30 USD Total 15.44 USD

Hope next month I will not be charged. Will reply about it soon...

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The charge you're seeing is likely due to using GP3 storage instead of GP2 for your RDS instance. The AWS RDS Free Tier specifically includes 20 GB of General Purpose SSD (gp2) storage per month. GP3 storage is not part of the free tier offering. When setting up an RDS instance, even if you select the free tier option, it's possible that GP3 was selected as the default storage type. This could be because GP3 is a newer and more flexible storage option that AWS may be promoting. However, to stay within the free tier, you should manually select GP2 storage during the RDS instance creation process. To resolve this issue and ensure you're using the free tier benefits: 1. Verify that your instance is using a supported free tier instance class (db.t3.micro or db.t4g.micro for PostgreSQL). 2. Check if you're within the 750 hours per month limit for the free tier. 3. Modify your RDS instance to use GP2 storage instead of GP3. 4. Ensure you're not exceeding the 20 GB storage limit for the free tier. If you've made these adjustments and still see unexpected charges, it would be advisable to open a support ticket with AWS to clarify the situation. They can provide specific guidance based on your account and usage details. Remember that the free tier is designed to help you get started, but it's always important to carefully review the settings when creating resources to ensure they align with the free tier specifications. **Sources** Can some one confirm why RDS free tier is charged a small amount? | AWS re:Post Do I currently have free tier / will this be covered by free tier | AWS re:Post Hosted PostgreSQL - Amazon RDS for PostgreSQL - AWS

I agree with everything that @Riku_Kobayashi says in his answer, as long as your account is still in-scope of Free Tier, which essentially means it is under 12 months old, and all your usage is within scope of Free Tier then you shouldn't be charged anything when your invoice is sent at the end of the month. https://console.aws.amazon.com/billing/home#/freetier will show what your Free Tier entitlements are, and how much you have used of each so far. Ensure that you're using an instance type in-scope of Free Tier (db.t3.micro or db.t4g.micro), single-AZ only, a database engine that is in-scope of Free Tier (MySQL, MariaDB, PostgreSQL or SQL Server Express Edition) and no more than 20GB of disk. As well as the link from @Riku_Kobayashi also see https://aws.amazon.com/rds/pricing/#Free_tier If your invoice comes in and you feel you have been billed for something unfairly, you can log a billing support case about it https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/billing-get-answers.html#billing-support

If you are getting billed and you are expecting not to then yeah you picked something wrong Are you asking folks what you are doing wrong? Because that requires different information