What's the overage charge for paid subscribers?
If you’ve used up your monthly allotment of fax pages and you're subscribed under a paid subscription, you'll be charged 5 cents for each additional page you send or receive. These overage pages are charged per month (when they occur).
If you see a note in your account saying you’ve exceeded your pages and you want to upgrade to a larger subscription instead of paying for overage pages, visit the Dropbox Sign pricing page.