Hi Noelia, Tireza here from Moz support team, we can definitely do invoice billing for all annual accounts, and the good news is that you get a great 20% discount off of the monthly rate when you go annual! Keep in mind that your account will automatically renew at the end of your 12 month billing cycle so be sure to let us know if you change your mind about renewing.
We can get you set up in our system and send you an invoice when you fill out and return our order form. You can download our form here: After you complete the form, please email it to help@moz.com and we can get you set up from there.
https://seomoz.box.com/s/gyj4skxnypwvvqt9pkop
If you don't have an account with us yet, we'll also need you to register your email address here: https://moz.com/community/join
Hope this helps!
