No, you will not be charged once your Teams Premium trial license expires. The license will automatically deactivate, and you will lose access to Premium features.

🔍 What Happens After Expiration:

• The trial license does not auto-renew into a paid subscription.
• Users will lose access to Premium features, such as advanced meeting protection, custom branding, and intelligent recap.
• There is no grace period—features are removed immediately upon expiration.

For more details, refer to Microsoft’s official documentation: Microsoft Teams Premium License – What happens if a user’s trial license expires