If I exceed my monthly submissions, will it just freeze the account for the remainder of the month, and then start over on the 1st of the next month?

Hi @designtoy!

Your account won't be disabled (you will still be able to log in), but this page will be displayed instead of all of your forms and respondents will not be able to see, fill out or submit your forms:

You are absolutely correct! The monthly limits will reset on the 1st of the month and you will again have the 100 monthly submissions left to receive. Please refer to this guide for more information on account limits: Understanding-Your-Account-Usage-and-Limits.

And please follow this guide if you would like to upgrade your account: How-to-Upgrade-My-Account.