To upgrade your account, navigate to 
Settings → Billing
Select "View plans" option from the billing page
Select next action from following options:
Upgrade from Startup plan to Business plan
or to "Talk to sales" if you'd like to upgrade to Enterprise plan
If you're selecting upgrade
Startup to Business
iClosed will generate separate invoice, with prorated charges (explained in this article here), and charge the credit card set on your file immediately, so you can start using higher tier as soon as payment is processed. For Enterprise upgrades
as soon as your call is finished with the Sales rep(or on agreed date), we'll process upgrade per agreement and your credit card will be charged pro-rated for difference between previous plan and Enterprise.
Changing billing period from Monthly to Yearly
In case you'd like to switch to a Yearly billing cycle, no matter if you're changing the subscription plan or not, you'll be able to do so from Settings → Billing menu as well.
Click on "Switch to yearly" button
New window will pop up with
detailed breakdown of the full yearly plan cost and
pro-rated calculation on how much you'd need to pay now
Your subscription start date will change to date when billing cycle changed, and next renewal date will be adjusted to the same date next year.
Annual subscription will remain active until the end of your newly set billing cycle.
iClosed also offers quarterly plans, but please contact our Sales team via "Talk to sales" button from "View plans" in Billing pane, or reach out to our Customer Support team via Intercom chat button below.
Adding user seats
Adding User seats during the current billing cycle will also affect your billing, in case you're adding more user seats than it's defined by your subscription plan, of course.
Adding a User is available from several pages:
- Settings → Billing → "Manage Seats" button
Settings → User Management → "Add User" button
Members → "Add member" button
No matter the option you select from above, next window you'll see will have same following options for adding a user seat:
Add new user email to send the invite out
Select a role for the new user
and optionally, to select team you'd like to assign new user to, in case you've previously created a Team inside of
Settings → User Management → Teams tabOption to add more users, by clicking on "Add another" button, in case you'd like to invite more than one, in bulk.
In the same window, you'll see total number of seats included, and information if there's going to be additional costs for adding more users.
In case you've already filled out all seats, you'll see a different notification that
"You will be charged at a prorated amount for each additional user"
Adding a user at additional cost is available at any moment, during the subscription billing period, and costs will be pro-rated (explained here in detail).